<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e22b5-b6fa-7990-943d-4c96c2bc836e,g:aae3b5dc-3299-41b0-8a00-c6816ca46393-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.allstate.com/role/Cover" xlink:type="simple" xlink:href="all-20260630.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019e22b5-bc23-74df-9f32-89a70ac2ddf6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentInformationTable_019e22b5-bc23-74df-9f32-89a70ac2ddf6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019e22b5-bc23-740b-a901-6a0f1c0d59ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e22b5-bc23-74df-9f32-89a70ac2ddf6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019e22b5-bc23-740b-a901-6a0f1c0d59ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-740b-a901-6a0f1c0d59ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e22b5-bc23-740b-a901-6a0f1c0d59ad" xlink:to="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-740b-a901-6a0f1c0d59ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e22b5-bc23-740b-a901-6a0f1c0d59ad" xlink:to="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e22b5-bc23-7f3f-8e84-92c4fef5fc41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:to="loc_us-gaap_CommonStockMember_019e22b5-bc23-7f3f-8e84-92c4fef5fc41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_SubordinatedDebenturesDue2053At5.10PercentMember_019e22b5-bc23-76fd-b4a1-bd08d763b545" xlink:href="all-20260630.xsd#all_SubordinatedDebenturesDue2053At5.10PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:to="loc_all_SubordinatedDebenturesDue2053At5.10PercentMember_019e22b5-bc23-76fd-b4a1-bd08d763b545" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesHPreferredStockMember_019e22b5-bc23-7017-9383-4be28151aa12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesHPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:to="loc_us-gaap_SeriesHPreferredStockMember_019e22b5-bc23-7017-9383-4be28151aa12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_SeriesIPreferredStockMember_019e22b5-bc23-7cbe-8928-eb35e93fe4ec" xlink:href="all-20260630.xsd#all_SeriesIPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:to="loc_all_SeriesIPreferredStockMember_019e22b5-bc23-7cbe-8928-eb35e93fe4ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_SeriesJPreferredStockMember_019e22b5-bc23-7de5-895a-2a8f393b92f1" xlink:href="all-20260630.xsd#all_SeriesJPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e22b5-bc23-7e8d-9bad-35baaff95823" xlink:to="loc_all_SeriesJPreferredStockMember_019e22b5-bc23-7de5-895a-2a8f393b92f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_019e22b5-bc23-757a-8875-f935872a8173" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e22b5-bc23-74df-9f32-89a70ac2ddf6" xlink:to="loc_dei_EntityListingsExchangeAxis_019e22b5-bc23-757a-8875-f935872a8173" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019e22b5-bc23-757a-8875-f935872a8173_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_019e22b5-bc23-757a-8875-f935872a8173" xlink:to="loc_dei_ExchangeDomain_019e22b5-bc23-757a-8875-f935872a8173_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019e22b5-bc23-72e2-9d73-a5a442bce229" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_019e22b5-bc23-757a-8875-f935872a8173" xlink:to="loc_dei_ExchangeDomain_019e22b5-bc23-72e2-9d73-a5a442bce229" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNYS_019e22b5-bc23-7987-a66b-9ed6527fa494" xlink:href="https://xbrl.sec.gov/exch/2026/exch-2026.xsd#exch_XNYS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_019e22b5-bc23-72e2-9d73-a5a442bce229" xlink:to="loc_exch_XNYS_019e22b5-bc23-7987-a66b-9ed6527fa494" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XCHI_019e22b5-bc23-73a5-9eb8-185479b68bb1" xlink:href="https://xbrl.sec.gov/exch/2026/exch-2026.xsd#exch_XCHI"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_019e22b5-bc23-72e2-9d73-a5a442bce229" xlink:to="loc_exch_XCHI_019e22b5-bc23-73a5-9eb8-185479b68bb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e22b5-bc23-7507-8eb9-8e4915617670" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentType_019e22b5-bc23-7507-8eb9-8e4915617670" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019e22b5-bc23-70f4-8cea-ee4c92e1b1bd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentQuarterlyReport_019e22b5-bc23-70f4-8cea-ee4c92e1b1bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e22b5-bc23-74a7-8cdb-b1782047c787" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentPeriodEndDate_019e22b5-bc23-74a7-8cdb-b1782047c787" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019e22b5-bc23-7162-8634-bc2e0220b886" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentTransitionReport_019e22b5-bc23-7162-8634-bc2e0220b886" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e22b5-bc23-7d4f-8b97-8e4bf0d10640" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityFileNumber_019e22b5-bc23-7d4f-8b97-8e4bf0d10640" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e22b5-bc23-7eb1-bef1-79c665c4c722" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityRegistrantName_019e22b5-bc23-7eb1-bef1-79c665c4c722" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e22b5-bc23-7065-94f5-6c7c2b73512c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e22b5-bc23-7065-94f5-6c7c2b73512c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e22b5-bc23-7f2f-a878-660a3b12a31d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e22b5-bc23-7f2f-a878-660a3b12a31d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e22b5-bc23-707b-9b64-7e997ea4b235" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityAddressAddressLine1_019e22b5-bc23-707b-9b64-7e997ea4b235" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e22b5-bc23-7bdc-b438-e2781aee8ef9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityAddressCityOrTown_019e22b5-bc23-7bdc-b438-e2781aee8ef9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e22b5-bc23-7607-a0b9-85039abdf48f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityAddressStateOrProvince_019e22b5-bc23-7607-a0b9-85039abdf48f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e22b5-bc23-7dd7-ab53-81446501840d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityAddressPostalZipCode_019e22b5-bc23-7dd7-ab53-81446501840d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e22b5-bc23-79f3-90cc-2ce2b33a96ff" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_CityAreaCode_019e22b5-bc23-79f3-90cc-2ce2b33a96ff" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e22b5-bc23-7e97-a591-f347fc8f8aff" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_LocalPhoneNumber_019e22b5-bc23-7e97-a591-f347fc8f8aff" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e22b5-bc23-78f3-8c52-084a8df336bf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_Security12bTitle_019e22b5-bc23-78f3-8c52-084a8df336bf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e22b5-bc23-7f78-9e66-75a25125adae" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_TradingSymbol_019e22b5-bc23-7f78-9e66-75a25125adae" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e22b5-bc23-747a-9c30-fc2c5b4c1326" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_SecurityExchangeName_019e22b5-bc23-747a-9c30-fc2c5b4c1326" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019e22b5-bc23-7933-ab66-4bda89c1b5d2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityCurrentReportingStatus_019e22b5-bc23-7933-ab66-4bda89c1b5d2" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019e22b5-bc23-776a-be1a-957b203c3e7c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityInteractiveDataCurrent_019e22b5-bc23-776a-be1a-957b203c3e7c" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019e22b5-bc23-74a8-b783-0cc385ea450e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityFilerCategory_019e22b5-bc23-74a8-b783-0cc385ea450e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019e22b5-bc23-7370-bcba-d31916a18529" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntitySmallBusiness_019e22b5-bc23-7370-bcba-d31916a18529" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e22b5-bc23-7ab4-a0e5-98b2b94d9847" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e22b5-bc23-7ab4-a0e5-98b2b94d9847" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019e22b5-bc23-782f-8c3b-23bf51f3fdaf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityShellCompany_019e22b5-bc23-782f-8c3b-23bf51f3fdaf" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019e22b5-bc23-7221-8217-c17a6e38d873" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019e22b5-bc23-7221-8217-c17a6e38d873" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e22b5-bc23-780d-aaab-b633bfc2adaf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_EntityCentralIndexKey_019e22b5-bc23-780d-aaab-b633bfc2adaf" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019e22b5-bc23-7299-8b9a-da6b151eec2d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_CurrentFiscalYearEndDate_019e22b5-bc23-7299-8b9a-da6b151eec2d" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019e22b5-bc23-7937-9d5f-8f8548791027" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentFiscalYearFocus_019e22b5-bc23-7937-9d5f-8f8548791027" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019e22b5-bc23-70ce-8a83-85fb0eaded98" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019e22b5-bc23-70ce-8a83-85fb0eaded98" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e22b5-bc23-7f3a-905d-cb5755090def" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e22b5-bc23-7661-9e2e-72deaacf3304" xlink:to="loc_dei_AmendmentFlag_019e22b5-bc23-7f3a-905d-cb5755090def" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/CondensedConsolidatedStatementsofOperationsunaudited" xlink:type="simple" xlink:href="all-20260630.xsd#CondensedConsolidatedStatementsofOperationsunaudited"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/CondensedConsolidatedStatementsofOperationsunaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e22b5-bc23-7b24-aa1c-42e0bcbdbbf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_StatementTable_019e22b5-bc23-7b24-aa1c-42e0bcbdbbf4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e22b5-bc23-7e86-899f-4872a69e64e7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e22b5-bc23-7b24-aa1c-42e0bcbdbbf4" xlink:to="loc_srt_ProductOrServiceAxis_019e22b5-bc23-7e86-899f-4872a69e64e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bc23-7e86-899f-4872a69e64e7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bc23-7e86-899f-4872a69e64e7" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bc23-7e86-899f-4872a69e64e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bc23-7e35-812e-901802e77390" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bc23-7e86-899f-4872a69e64e7" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bc23-7e35-812e-901802e77390" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember_019e22b5-bc23-74e2-a419-595ce11f0670" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bc23-7e35-812e-901802e77390" xlink:to="loc_us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember_019e22b5-bc23-74e2-a419-595ce11f0670" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AccidentHealthAndLifeInsuranceProductLineMember_019e22b5-bc23-719e-9430-4f1602f30546" xlink:href="all-20260630.xsd#all_AccidentHealthAndLifeInsuranceProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bc23-7e35-812e-901802e77390" xlink:to="loc_all_AccidentHealthAndLifeInsuranceProductLineMember_019e22b5-bc23-719e-9430-4f1602f30546" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019e22b5-bc23-7ad5-8668-158871a4bbb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:to="loc_us-gaap_PremiumsEarnedNet_019e22b5-bc23-7ad5-8668-158871a4bbb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_019e22b5-bc23-73b7-998e-806c9db2d0cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:to="loc_us-gaap_OtherIncome_019e22b5-bc23-73b7-998e-806c9db2d0cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e22b5-bc23-73f2-8666-5e46ebf4b1f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:to="loc_us-gaap_NetInvestmentIncome_019e22b5-bc23-73f2-8666-5e46ebf4b1f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_019e22b5-bc23-72f8-82f0-d5831d3323dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_019e22b5-bc23-72f8-82f0-d5831d3323dd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e22b5-bc23-7f62-be58-b3b8ce92ad4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e22b5-bc23-784c-b501-f592ff26bd3c" xlink:to="loc_us-gaap_Revenues_019e22b5-bc23-7f62-be58-b3b8ce92ad4e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BenefitsLossesAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019e22b5-bc23-75c1-8708-e59894faa443" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019e22b5-bc23-75c1-8708-e59894faa443" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AccidentAndHealthInsuranceContractBenefitsNetOfReinsuranceRecoveries_019e22b5-bc23-76ee-a8e8-e42eb5938013" xlink:href="all-20260630.xsd#all_AccidentAndHealthInsuranceContractBenefitsNetOfReinsuranceRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_all_AccidentAndHealthInsuranceContractBenefitsNetOfReinsuranceRecoveries_019e22b5-bc23-76ee-a8e8-e42eb5938013" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019e22b5-bc23-759e-b97b-7f70ab454477" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019e22b5-bc23-759e-b97b-7f70ab454477" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019e22b5-bc23-74d1-b1a0-b4371366bcb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019e22b5-bc23-74d1-b1a0-b4371366bcb6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bc23-779b-9f00-8b4e1c01b94b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bc23-779b-9f00-8b4e1c01b94b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e22b5-bc23-7c89-ac4b-58376b9044d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_RestructuringCharges_019e22b5-bc23-7c89-ac4b-58376b9044d0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bc23-7345-b9c6-116648ac4714" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bc23-7345-b9c6-116648ac4714" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e22b5-bc23-7cc8-aff1-78e1b44f10b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_InterestExpenseOperating_019e22b5-bc23-7cc8-aff1-78e1b44f10b2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_019e22b5-bc23-7549-a471-1a620a2beb8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BenefitsLossesAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019e22b5-bc23-78fb-a762-633d7d577d52" xlink:to="loc_us-gaap_BenefitsLossesAndExpenses_019e22b5-bc23-7549-a471-1a620a2beb8c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_019e39f1-34ff-77fb-a860-dc7e8b2e556c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_019e39f1-34ff-77fb-a860-dc7e8b2e556c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_IncomeLossFromOperationsBeforeIncomeTaxExpenseBenefit_019e22b5-bc23-7c7b-ab3f-ca95c2069c79" xlink:href="all-20260630.xsd#all_IncomeLossFromOperationsBeforeIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_all_IncomeLossFromOperationsBeforeIncomeTaxExpenseBenefit_019e22b5-bc23-7c7b-ab3f-ca95c2069c79" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e22b5-bc23-7527-ba5a-701bb6f3ea15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e22b5-bc23-7527-ba5a-701bb6f3ea15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019e22b5-bc23-7994-8f88-5164db5fac57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_ProfitLoss_019e22b5-bc23-7994-8f88-5164db5fac57" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019e22b5-bc23-7616-ad5e-ffa149d0777b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019e22b5-bc23-7616-ad5e-ffa149d0777b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e22b5-bc23-7623-ba7b-0ea1d3b8f288" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_NetIncomeLoss_019e22b5-bc23-7623-ba7b-0ea1d3b8f288" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e22b5-bc23-77b3-b439-64a3e28e3d48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e22b5-bc23-77b3-b439-64a3e28e3d48" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e22b5-bc23-7756-82cb-eb34fb960c9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e22b5-bc23-7756-82cb-eb34fb960c9d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e22b5-bc23-75b2-932c-0b68a779e314" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e22b5-bc23-75b2-932c-0b68a779e314" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_019e22b5-bc23-70d7-bc5e-8731cb8dfcdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-79f2-bc4c-c9bdacc23b98" xlink:to="loc_us-gaap_EarningsPerShareAbstract_019e22b5-bc23-70d7-bc5e-8731cb8dfcdc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019e22b5-bc23-7bb3-810f-af302baf6bb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019e22b5-bc23-70d7-bc5e-8731cb8dfcdc" xlink:to="loc_us-gaap_EarningsPerShareBasic_019e22b5-bc23-7bb3-810f-af302baf6bb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e22b5-bc23-7228-aa2b-2323aac689e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019e22b5-bc23-70d7-bc5e-8731cb8dfcdc" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e22b5-bc23-7228-aa2b-2323aac689e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019e22b5-bc23-757d-8cd9-49a9fc4e8450" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019e22b5-bc23-70d7-bc5e-8731cb8dfcdc" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019e22b5-bc23-757d-8cd9-49a9fc4e8450" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e22b5-bc23-73dc-ba2c-3fd2db8fdaee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019e22b5-bc23-70d7-bc5e-8731cb8dfcdc" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e22b5-bc23-73dc-ba2c-3fd2db8fdaee" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/CondensedConsolidatedStatementsofShareholdersEquityunaudited" xlink:type="simple" xlink:href="all-20260630.xsd#CondensedConsolidatedStatementsofShareholdersEquityunaudited"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/CondensedConsolidatedStatementsofShareholdersEquityunaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e22b5-bc23-7ce7-87f6-671f760046bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e22b5-bc23-783d-b60a-6aa8fb2a7711" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-7ce7-87f6-671f760046bd" xlink:to="loc_us-gaap_StatementTable_019e22b5-bc23-783d-b60a-6aa8fb2a7711" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bc23-7927-8ff4-f93d6660f56b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e22b5-bc23-783d-b60a-6aa8fb2a7711" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bc23-7927-8ff4-f93d6660f56b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7927-8ff4-f93d6660f56b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bc23-7927-8ff4-f93d6660f56b" xlink:to="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7927-8ff4-f93d6660f56b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bc23-7927-8ff4-f93d6660f56b" xlink:to="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019e22b5-bc23-7661-b22a-ec059b3121a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_PreferredStockMember_019e22b5-bc23-7661-b22a-ec059b3121a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember_019e22b5-bc23-74eb-ad65-0cf171638c02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember_019e22b5-bc23-74eb-ad65-0cf171638c02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e22b5-bc23-75e7-8d1d-400265ac1807" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_CommonStockMember_019e22b5-bc23-75e7-8d1d-400265ac1807" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e22b5-bc23-743f-aa46-ff41efb1c550" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e22b5-bc23-743f-aa46-ff41efb1c550" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e22b5-bc23-7850-8d96-693e4ccd25c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_RetainedEarningsMember_019e22b5-bc23-7850-8d96-693e4ccd25c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e22b5-bc23-7ebf-9db5-99fd846991cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e22b5-bc23-7ebf-9db5-99fd846991cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e22b5-bc23-738e-aeca-39f7ffc9ba49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e22b5-bc23-738e-aeca-39f7ffc9ba49" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019e22b5-bc23-7520-936e-47a60b33f698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bc23-7969-b59c-c5aba6a37b11" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019e22b5-bc23-7520-936e-47a60b33f698" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e22b5-bc23-7ce7-87f6-671f760046bd" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e22b5-bc23-7c22-9753-b053280a897a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e22b5-bc23-7c22-9753-b053280a897a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e22b5-bc23-778f-ac80-7138acaf62d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e22b5-bc23-778f-ac80-7138acaf62d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019e22b5-bc23-7944-a77d-4c4afc5861e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_ProfitLoss_019e22b5-bc23-7944-a77d-4c4afc5861e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019e22b5-bc23-7b39-83ba-95feb4612da7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_DividendsCommonStockCash_019e22b5-bc23-7b39-83ba-95feb4612da7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_019e22b5-bc23-7d0f-a46b-16002b852699" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_DividendsPreferredStockCash_019e22b5-bc23-7d0f-a46b-16002b852699" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e22b5-bc23-7d7e-8e97-ad75d0478213" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e22b5-bc23-7d7e-8e97-ad75d0478213" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e22b5-bc23-797c-8f9d-8871da162690" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e22b5-bc23-797c-8f9d-8871da162690" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax_019e22b5-bc23-7a53-8f63-ce25e9edd72e" xlink:href="all-20260630.xsd#all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax_019e22b5-bc23-7a53-8f63-ce25e9edd72e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_019e22b5-bc23-7dce-9cfc-1ca37f3a67ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_019e22b5-bc23-7dce-9cfc-1ca37f3a67ed" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_019e22b5-bc23-789e-a041-4bf35dbdebbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_019e22b5-bc23-789e-a041-4bf35dbdebbc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax_019e22b5-bc23-757b-905f-140cb66977ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax_019e22b5-bc23-757b-905f-140cb66977ea" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NoncontrollingInterestIncreaseFromCapitalTransaction_019e22b5-bc23-71d4-90d1-3c056f8fd424" xlink:href="all-20260630.xsd#all_NoncontrollingInterestIncreaseFromCapitalTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_all_NoncontrollingInterestIncreaseFromCapitalTransaction_019e22b5-bc23-71d4-90d1-3c056f8fd424" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e22b5-bc23-771d-8e05-10442e2ae113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e22b5-bc23-7a9e-898c-a866aa835452" xlink:to="loc_us-gaap_StockholdersEquity_019e22b5-bc23-771d-8e05-10442e2ae113" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e22b5-bc23-70bf-af9e-5a49b8a89369" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsFinancialPerformanceDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReportableSegmentsScheduleofReportableSegmentsFinancialPerformanceDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsFinancialPerformanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7743-a5bc-79dedb4658d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7743-a5bc-79dedb4658d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7b10-8077-ed17b5cfdf5e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7743-a5bc-79dedb4658d1" xlink:to="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7b10-8077-ed17b5cfdf5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7b10-8077-ed17b5cfdf5e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7b10-8077-ed17b5cfdf5e" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7b10-8077-ed17b5cfdf5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7105-97a0-fbf1f9a443db" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7b10-8077-ed17b5cfdf5e" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7105-97a0-fbf1f9a443db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf2-7675-9be6-f1aa787de023" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7105-97a0-fbf1f9a443db" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf2-7675-9be6-f1aa787de023" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019e22b5-bcf2-79d7-81bb-2fe3b65daef6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7105-97a0-fbf1f9a443db" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019e22b5-bcf2-79d7-81bb-2fe3b65daef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7ff6-9397-3be943690527" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7743-a5bc-79dedb4658d1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7ff6-9397-3be943690527" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7ff6-9397-3be943690527_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7ff6-9397-3be943690527" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7ff6-9397-3be943690527_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7992-b629-50204c09c081" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7ff6-9397-3be943690527" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7992-b629-50204c09c081" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyLiabilityMember_019e22b5-bcf2-7099-a50c-f560c561f917" xlink:href="all-20260630.xsd#all_PropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7992-b629-50204c09c081" xlink:to="loc_all_PropertyLiabilityMember_019e22b5-bcf2-7099-a50c-f560c561f917" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionServicesMember_019e22b5-bcf2-7771-a6b9-016dc3eb3fef" xlink:href="all-20260630.xsd#all_ProtectionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7992-b629-50204c09c081" xlink:to="loc_all_ProtectionServicesMember_019e22b5-bcf2-7771-a6b9-016dc3eb3fef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf2-7f1b-901d-d5553b1a4922" xlink:href="all-20260630.xsd#all_AllstateHealthAndBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7992-b629-50204c09c081" xlink:to="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf2-7f1b-901d-d5553b1a4922" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf2-79fe-a91d-bd21de634a10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7992-b629-50204c09c081" xlink:to="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf2-79fe-a91d-bd21de634a10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7c84-9af6-7ec29eef44ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7743-a5bc-79dedb4658d1" xlink:to="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7c84-9af6-7ec29eef44ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7c84-9af6-7ec29eef44ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7c84-9af6-7ec29eef44ab" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7c84-9af6-7ec29eef44ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7dd6-92da-309914063eaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7c84-9af6-7ec29eef44ab" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7dd6-92da-309914063eaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateProtectionMember_019e22b5-bcf2-78ca-9d98-ab9be8d17d8a" xlink:href="all-20260630.xsd#all_AllstateProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7dd6-92da-309914063eaf" xlink:to="loc_all_AllstateProtectionMember_019e22b5-bcf2-78ca-9d98-ab9be8d17d8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RunOffPropertyLiabilityMember_019e22b5-bcf2-7733-b225-48997027488a" xlink:href="all-20260630.xsd#all_RunOffPropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7dd6-92da-309914063eaf" xlink:to="loc_all_RunOffPropertyLiabilityMember_019e22b5-bcf2-7733-b225-48997027488a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_UnderwritingGainLoss_019e22b5-bcf2-7be4-bb82-f4c789b94664" xlink:href="all-20260630.xsd#all_UnderwritingGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_all_UnderwritingGainLoss_019e22b5-bcf2-7be4-bb82-f4c789b94664" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OperatingIncomeLossAfterTax_019e22b5-bcf2-76c3-b006-550dfb18239e" xlink:href="all-20260630.xsd#all_OperatingIncomeLossAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_all_OperatingIncomeLossAfterTax_019e22b5-bcf2-76c3-b006-550dfb18239e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e22b5-bcf2-7a6c-aa7e-721951296044" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_NetInvestmentIncome_019e22b5-bcf2-7a6c-aa7e-721951296044" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RealizedCapitalGainsLossesContinuingOperations_019e22b5-bcf2-7bb6-b8e5-73a400a142a4" xlink:href="all-20260630.xsd#all_RealizedCapitalGainsLossesContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_all_RealizedCapitalGainsLossesContinuingOperations_019e22b5-bcf2-7bb6-b8e5-73a400a142a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bcf2-796d-a4e6-4fccc9bc6bc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bcf2-796d-a4e6-4fccc9bc6bc1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bcf2-7d4c-8472-7fcd4e1aaefa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bcf2-7d4c-8472-7fcd4e1aaefa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_019e22b5-bcf2-7e55-965e-c499925b3da7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_019e22b5-bcf2-7e55-965e-c499925b3da7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019e22b5-bcf2-7299-9382-9391efcf1865" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019e22b5-bcf2-7299-9382-9391efcf1865" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_IncomeTaxExpenseBenefitReconcilingItems_019e22b5-bcf2-7024-833d-873e345d8199" xlink:href="all-20260630.xsd#all_IncomeTaxExpenseBenefitReconcilingItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_all_IncomeTaxExpenseBenefitReconcilingItems_019e22b5-bcf2-7024-833d-873e345d8199" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019e22b5-bcf2-7b37-ab1a-16f0df568b70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019e22b5-bcf2-7b37-ab1a-16f0df568b70" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e22b5-bcf2-7801-b1c4-164b8d636230" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e22b5-bcf2-7801-b1c4-164b8d636230" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e22b5-bcf2-7649-b06d-33729c16eb9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-7aad-b761-3d20b7001322" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e22b5-bcf2-7649-b06d-33729c16eb9f" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsRevenueInformationDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReportableSegmentsScheduleofReportableSegmentsRevenueInformationDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsRevenueInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7023-9fa6-705552b89690" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7023-9fa6-705552b89690" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7bb9-8d94-c12477bc1f62" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7023-9fa6-705552b89690" xlink:to="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7bb9-8d94-c12477bc1f62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb9-8d94-c12477bc1f62_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7bb9-8d94-c12477bc1f62" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb9-8d94-c12477bc1f62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb3-aaa7-7073c9fa8440" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf2-7bb9-8d94-c12477bc1f62" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb3-aaa7-7073c9fa8440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf2-748f-b4a7-c57b543697ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb3-aaa7-7073c9fa8440" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf2-748f-b4a7-c57b543697ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019e22b5-bcf2-701a-b641-3c43178c4a48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb3-aaa7-7073c9fa8440" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019e22b5-bcf2-701a-b641-3c43178c4a48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019e22b5-bcf2-7fac-ae16-3beff34dedae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf2-7bb3-aaa7-7073c9fa8440" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019e22b5-bcf2-7fac-ae16-3beff34dedae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e22b5-bcf2-7d7e-8524-bbd05f3126f5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7023-9fa6-705552b89690" xlink:to="loc_srt_ProductOrServiceAxis_019e22b5-bcf2-7d7e-8524-bbd05f3126f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-7d7e-8524-bbd05f3126f5_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bcf2-7d7e-8524-bbd05f3126f5" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-7d7e-8524-bbd05f3126f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bcf2-7d7e-8524-bbd05f3126f5" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AutoMember_019e22b5-bcf2-718d-b220-f2db64626cbb" xlink:href="all-20260630.xsd#all_AutoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_AutoMember_019e22b5-bcf2-718d-b220-f2db64626cbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_HomeOwnersMember_019e22b5-bcf2-7975-82ce-3c0117dd7cbb" xlink:href="all-20260630.xsd#all_HomeOwnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_HomeOwnersMember_019e22b5-bcf2-7975-82ce-3c0117dd7cbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_SpecialtyLinesMember_019f88c6-5a03-7c47-9c42-52c587363436" xlink:href="all-20260630.xsd#all_SpecialtyLinesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_SpecialtyLinesMember_019f88c6-5a03-7c47-9c42-52c587363436" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember_019e22b5-bcf2-756f-8dbf-f89d41c280f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember_019e22b5-bcf2-756f-8dbf-f89d41c280f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BrokeredSolutionsAndCollateralProtectionMember_019f88c7-5e75-79d2-8e8a-0b67482c61eb" xlink:href="all-20260630.xsd#all_BrokeredSolutionsAndCollateralProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_BrokeredSolutionsAndCollateralProtectionMember_019f88c7-5e75-79d2-8e8a-0b67482c61eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionPlansMember_019e22b5-bcf2-7d80-a4d4-ab7d1a91cfef" xlink:href="all-20260630.xsd#all_ProtectionPlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_ProtectionPlansMember_019e22b5-bcf2-7d80-a4d4-ab7d1a91cfef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RoadsideAssistanceMember_019e22b5-bcf2-7814-ae25-e9e6dbdeeca0" xlink:href="all-20260630.xsd#all_RoadsideAssistanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_RoadsideAssistanceMember_019e22b5-bcf2-7814-ae25-e9e6dbdeeca0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionAndInsuranceProductsMember_019e22b5-bcf2-7938-8cd8-d01cb0830c6e" xlink:href="all-20260630.xsd#all_ProtectionAndInsuranceProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_ProtectionAndInsuranceProductsMember_019e22b5-bcf2-7938-8cd8-d01cb0830c6e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_EmployerVoluntaryBenefitsMember_019e22b5-bcf2-778c-a238-c73d86886895" xlink:href="all-20260630.xsd#all_EmployerVoluntaryBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_EmployerVoluntaryBenefitsMember_019e22b5-bcf2-778c-a238-c73d86886895" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_GroupHealthMember_019e22b5-bcf2-7ad0-9583-9a33a98863f4" xlink:href="all-20260630.xsd#all_GroupHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bcf2-71a0-a011-7f55bc007338" xlink:to="loc_all_GroupHealthMember_019e22b5-bcf2-7ad0-9583-9a33a98863f4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7540-9a3d-186d847e24a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7023-9fa6-705552b89690" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7540-9a3d-186d847e24a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7540-9a3d-186d847e24a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7540-9a3d-186d847e24a5" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7540-9a3d-186d847e24a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7649-a110-81249732c5b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7540-9a3d-186d847e24a5" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7649-a110-81249732c5b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyLiabilityMember_019e22b5-bcf2-7d09-90f4-db5905b85c0b" xlink:href="all-20260630.xsd#all_PropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7649-a110-81249732c5b3" xlink:to="loc_all_PropertyLiabilityMember_019e22b5-bcf2-7d09-90f4-db5905b85c0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionServicesMember_019e22b5-bcf2-766f-8e85-abc314e3b419" xlink:href="all-20260630.xsd#all_ProtectionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7649-a110-81249732c5b3" xlink:to="loc_all_ProtectionServicesMember_019e22b5-bcf2-766f-8e85-abc314e3b419" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf2-7362-8d50-2b5f346132cf" xlink:href="all-20260630.xsd#all_AllstateHealthAndBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7649-a110-81249732c5b3" xlink:to="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf2-7362-8d50-2b5f346132cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf2-7006-bef8-37423bf46a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7649-a110-81249732c5b3" xlink:to="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf2-7006-bef8-37423bf46a3c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7b55-8dba-a4ad2c35ffc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7023-9fa6-705552b89690" xlink:to="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7b55-8dba-a4ad2c35ffc9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7b55-8dba-a4ad2c35ffc9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7b55-8dba-a4ad2c35ffc9" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7b55-8dba-a4ad2c35ffc9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7407-800a-aa40ae3fc937" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-7b55-8dba-a4ad2c35ffc9" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7407-800a-aa40ae3fc937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateProtectionMember_019e22b5-bcf2-7696-a393-10b93341d157" xlink:href="all-20260630.xsd#all_AllstateProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7407-800a-aa40ae3fc937" xlink:to="loc_all_AllstateProtectionMember_019e22b5-bcf2-7696-a393-10b93341d157" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RunOffPropertyLiabilityMember_019e22b5-bcf2-76b0-9b7d-5af273ff4620" xlink:href="all-20260630.xsd#all_RunOffPropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7407-800a-aa40ae3fc937" xlink:to="loc_all_RunOffPropertyLiabilityMember_019e22b5-bcf2-76b0-9b7d-5af273ff4620" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019e22b5-bcf2-7200-b0de-af70db3f7280" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_us-gaap_PremiumsEarnedNet_019e22b5-bcf2-7200-b0de-af70db3f7280" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_IntersegmentPremiumsAndServiceFees_019e22b5-bcf2-7446-a8da-4af255002a5d" xlink:href="all-20260630.xsd#all_IntersegmentPremiumsAndServiceFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_all_IntersegmentPremiumsAndServiceFees_019e22b5-bcf2-7446-a8da-4af255002a5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_019e22b5-bcf2-77ee-8604-142ad4de0ae4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_019e22b5-bcf2-77ee-8604-142ad4de0ae4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e22b5-bcf2-7fde-9b50-e6bb41cc7a61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_us-gaap_NetInvestmentIncome_019e22b5-bcf2-7fde-9b50-e6bb41cc7a61" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RealizedCapitalGainsLossesContinuingOperations_019e22b5-bcf2-74b9-99ba-6c86d0512388" xlink:href="all-20260630.xsd#all_RealizedCapitalGainsLossesContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_all_RealizedCapitalGainsLossesContinuingOperations_019e22b5-bcf2-74b9-99ba-6c86d0512388" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e22b5-bcf2-71c2-ac51-5effec1fae3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75a9-ac28-e907dc40ad33" xlink:to="loc_us-gaap_Revenues_019e22b5-bcf2-71c2-ac51-5effec1fae3c" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsExpenseInformationUsedinMeasureforSegmentProfitorLossDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReportableSegmentsScheduleofReportableSegmentsExpenseInformationUsedinMeasureforSegmentProfitorLossDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsExpenseInformationUsedinMeasureforSegmentProfitorLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bcf2-707e-91ad-a14d72b0b5d8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bcf2-707e-91ad-a14d72b0b5d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bcf2-707e-91ad-a14d72b0b5d8_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bcf2-707e-91ad-a14d72b0b5d8" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bcf2-707e-91ad-a14d72b0b5d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bcf2-7902-b437-5abf94c3e617" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bcf2-707e-91ad-a14d72b0b5d8" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bcf2-7902-b437-5abf94c3e617" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf2-78ec-812d-b55bbfb2187b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bcf2-7902-b437-5abf94c3e617" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf2-78ec-812d-b55bbfb2187b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7d87-b733-1a6eceec0662" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7d87-b733-1a6eceec0662" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7d87-b733-1a6eceec0662_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7d87-b733-1a6eceec0662" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7d87-b733-1a6eceec0662_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7049-83f6-ba941746db89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf2-7d87-b733-1a6eceec0662" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7049-83f6-ba941746db89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyLiabilityMember_019e22b5-bcf2-777d-9138-440bdb7ab4f6" xlink:href="all-20260630.xsd#all_PropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7049-83f6-ba941746db89" xlink:to="loc_all_PropertyLiabilityMember_019e22b5-bcf2-777d-9138-440bdb7ab4f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionServicesMember_019e22b5-bcf2-7531-8651-7bf9c133df0b" xlink:href="all-20260630.xsd#all_ProtectionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7049-83f6-ba941746db89" xlink:to="loc_all_ProtectionServicesMember_019e22b5-bcf2-7531-8651-7bf9c133df0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf2-7fd4-b63b-543ee60294e9" xlink:href="all-20260630.xsd#all_AllstateHealthAndBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7049-83f6-ba941746db89" xlink:to="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf2-7fd4-b63b-543ee60294e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf2-74b0-977e-8f08fe25359f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf2-7049-83f6-ba941746db89" xlink:to="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf2-74b0-977e-8f08fe25359f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-70d8-ac24-09fe3a3f47e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:to="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-70d8-ac24-09fe3a3f47e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-70d8-ac24-09fe3a3f47e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-70d8-ac24-09fe3a3f47e8" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-70d8-ac24-09fe3a3f47e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7934-ac29-86008f4a244f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf2-70d8-ac24-09fe3a3f47e8" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7934-ac29-86008f4a244f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateProtectionMember_019e22b5-bcf2-7800-b334-aa510243cf67" xlink:href="all-20260630.xsd#all_AllstateProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7934-ac29-86008f4a244f" xlink:to="loc_all_AllstateProtectionMember_019e22b5-bcf2-7800-b334-aa510243cf67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RunOffPropertyLiabilityMember_019e22b5-bcf2-75c3-a38f-5513d8cfb9ec" xlink:href="all-20260630.xsd#all_RunOffPropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf2-7934-ac29-86008f4a244f" xlink:to="loc_all_RunOffPropertyLiabilityMember_019e22b5-bcf2-75c3-a38f-5513d8cfb9ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bcf2-7261-ac19-869bfa870d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:to="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bcf2-7261-ac19-869bfa870d9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastrophicEventDomain_019e22b5-bcf2-7261-ac19-869bfa870d9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bcf2-7261-ac19-869bfa870d9b" xlink:to="loc_us-gaap_CatastrophicEventDomain_019e22b5-bcf2-7261-ac19-869bfa870d9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastrophicEventDomain_019e22b5-bcf2-7b90-9aa7-8a109bcf8a85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bcf2-7261-ac19-869bfa870d9b" xlink:to="loc_us-gaap_CatastrophicEventDomain_019e22b5-bcf2-7b90-9aa7-8a109bcf8a85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastropheMember_019e22b5-bcf2-7380-b70e-8e9a6a615995" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastropheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CatastrophicEventDomain_019e22b5-bcf2-7b90-9aa7-8a109bcf8a85" xlink:to="loc_us-gaap_CatastropheMember_019e22b5-bcf2-7380-b70e-8e9a6a615995" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bcf2-715d-863b-7959a7a09985" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf2-7a28-bb84-8087a08f44d4" xlink:to="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bcf2-715d-863b-7959a7a09985" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bcf2-715d-863b-7959a7a09985_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bcf2-715d-863b-7959a7a09985" xlink:to="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bcf2-715d-863b-7959a7a09985_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bcf2-7357-a1a7-0f4409b77606" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bcf2-715d-863b-7959a7a09985" xlink:to="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bcf2-7357-a1a7-0f4409b77606" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NonCatastropheReestimatesMember_019e22b5-bcf2-7c1a-a111-e45a8ac171e0" xlink:href="all-20260630.xsd#all_NonCatastropheReestimatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bcf2-7357-a1a7-0f4409b77606" xlink:to="loc_all_NonCatastropheReestimatesMember_019e22b5-bcf2-7c1a-a111-e45a8ac171e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019e22b5-bcf2-7549-b57e-6f6823f5280d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019e22b5-bcf2-7549-b57e-6f6823f5280d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bcf2-772f-b218-8022bfc6b50a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bcf2-772f-b218-8022bfc6b50a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AccidentAndHealthInsuranceContractBenefitsNetOfReinsuranceRecoveries_019e22b5-bcf2-748c-9d58-4ab6e4868768" xlink:href="all-20260630.xsd#all_AccidentAndHealthInsuranceContractBenefitsNetOfReinsuranceRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_all_AccidentAndHealthInsuranceContractBenefitsNetOfReinsuranceRecoveries_019e22b5-bcf2-748c-9d58-4ab6e4868768" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019e22b5-bcf2-7113-8367-eef5cd6e74a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019e22b5-bcf2-7113-8367-eef5cd6e74a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_019e22b5-bcf2-753a-b3ac-255d80c623f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_AdvertisingExpense_019e22b5-bcf2-753a-b3ac-255d80c623f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NonDeferrableCommissions_019e22b5-bcf2-710e-83dc-31dea7c33a48" xlink:href="all-20260630.xsd#all_NonDeferrableCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_all_NonDeferrableCommissions_019e22b5-bcf2-710e-83dc-31dea7c33a48" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bcf2-7c91-926a-044ffc02c86f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bcf2-7c91-926a-044ffc02c86f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e22b5-bcf2-74ba-b093-c7841113a61a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_InterestExpenseOperating_019e22b5-bcf2-74ba-b093-c7841113a61a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e22b5-bcf2-7436-8b77-b4c2d4d47f83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_RestructuringCharges_019e22b5-bcf2-7436-8b77-b4c2d4d47f83" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_019e22b5-bcf2-71e9-9c0e-3f13a1f2559e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_OtherExpenses_019e22b5-bcf2-71e9-9c0e-3f13a1f2559e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e22b5-bcf2-7f73-aca3-05b729709a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e22b5-bcf2-7f73-aca3-05b729709a7a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e22b5-bcf2-778e-a199-c0519e905c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e22b5-bcf2-778e-a199-c0519e905c7b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019e22b5-bcf2-7e1a-934a-f079b00609dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_OperatingExpenses_019e22b5-bcf2-7e1a-934a-f079b00609dc" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019e22b5-bcf2-7dbe-80f8-8a8673e20597" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf2-75db-a13d-24c421afa5d9" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019e22b5-bcf2-7dbe-80f8-8a8673e20597" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReportableSegmentsScheduleofAdditionalSignificantFinancialPerformanceDataDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReportableSegmentsScheduleofAdditionalSignificantFinancialPerformanceDataDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReportableSegmentsScheduleofAdditionalSignificantFinancialPerformanceDataDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7ef5-91b8-aee85d7a2a79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7b0e-833e-01ac916f511c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7ef5-91b8-aee85d7a2a79" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7b0e-833e-01ac916f511c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7ca6-aed1-389f32bd71c6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7b0e-833e-01ac916f511c" xlink:to="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7ca6-aed1-389f32bd71c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-7ca6-aed1-389f32bd71c6_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7ca6-aed1-389f32bd71c6" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-7ca6-aed1-389f32bd71c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-714f-9576-9d3044feaf01" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7ca6-aed1-389f32bd71c6" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-714f-9576-9d3044feaf01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf3-722b-8833-7c4d0fe6bd41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-714f-9576-9d3044feaf01" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf3-722b-8833-7c4d0fe6bd41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e22b5-bcf3-7997-99fd-6bdde9a6bd52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-714f-9576-9d3044feaf01" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e22b5-bcf3-7997-99fd-6bdde9a6bd52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-7480-9581-7896129ee730" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7b0e-833e-01ac916f511c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-7480-9581-7896129ee730" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7480-9581-7896129ee730_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-7480-9581-7896129ee730" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7480-9581-7896129ee730_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7938-a96d-b087e5e8b5af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-7480-9581-7896129ee730" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7938-a96d-b087e5e8b5af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyLiabilityMember_019e22b5-bcf3-7257-b4cc-15a7428b6de1" xlink:href="all-20260630.xsd#all_PropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7938-a96d-b087e5e8b5af" xlink:to="loc_all_PropertyLiabilityMember_019e22b5-bcf3-7257-b4cc-15a7428b6de1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionServicesMember_019e22b5-bcf3-7f6c-8a86-528711700b82" xlink:href="all-20260630.xsd#all_ProtectionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7938-a96d-b087e5e8b5af" xlink:to="loc_all_ProtectionServicesMember_019e22b5-bcf3-7f6c-8a86-528711700b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf3-7a63-bb21-aff6001aed49" xlink:href="all-20260630.xsd#all_AllstateHealthAndBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7938-a96d-b087e5e8b5af" xlink:to="loc_all_AllstateHealthAndBenefitsMember_019e22b5-bcf3-7a63-bb21-aff6001aed49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf3-73e5-86ca-7c4c965744fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-7938-a96d-b087e5e8b5af" xlink:to="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf3-73e5-86ca-7c4c965744fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-790b-a3c1-43851dbac305" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7b0e-833e-01ac916f511c" xlink:to="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-790b-a3c1-43851dbac305" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-790b-a3c1-43851dbac305_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-790b-a3c1-43851dbac305" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-790b-a3c1-43851dbac305_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-7c9b-a165-97720b994075" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-790b-a3c1-43851dbac305" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-7c9b-a165-97720b994075" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateProtectionMember_019e22b5-bcf3-7655-b554-dcc8f2ff9294" xlink:href="all-20260630.xsd#all_AllstateProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-7c9b-a165-97720b994075" xlink:to="loc_all_AllstateProtectionMember_019e22b5-bcf3-7655-b554-dcc8f2ff9294" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019e22b5-bcf3-7607-b2aa-83bdb68bd6a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7ef5-91b8-aee85d7a2a79" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019e22b5-bcf3-7607-b2aa-83bdb68bd6a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bcf3-78bb-a44c-7fc708cf195c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7ef5-91b8-aee85d7a2a79" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e22b5-bcf3-78bb-a44c-7fc708cf195c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e22b5-bcf3-72df-a22e-d0ff4747f438" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7ef5-91b8-aee85d7a2a79" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e22b5-bcf3-72df-a22e-d0ff4747f438" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsTotalAssetsInvestmentsandDeferredPolicyAcquisitionCostsDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReportableSegmentsScheduleofReportableSegmentsTotalAssetsInvestmentsandDeferredPolicyAcquisitionCostsDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReportableSegmentsScheduleofReportableSegmentsTotalAssetsInvestmentsandDeferredPolicyAcquisitionCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7af8-93f9-0a44176dd82a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7ba0-a5c2-3ceb178ba3d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7af8-93f9-0a44176dd82a" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7ba0-a5c2-3ceb178ba3d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7d0b-b1ff-dc6e40c725a8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7ba0-a5c2-3ceb178ba3d0" xlink:to="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7d0b-b1ff-dc6e40c725a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-7d0b-b1ff-dc6e40c725a8_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7d0b-b1ff-dc6e40c725a8" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-7d0b-b1ff-dc6e40c725a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-784b-a878-74f2c7dce7c4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e22b5-bcf3-7d0b-b1ff-dc6e40c725a8" xlink:to="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-784b-a878-74f2c7dce7c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf3-7738-8e64-a6a14ee37352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-784b-a878-74f2c7dce7c4" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e22b5-bcf3-7738-8e64-a6a14ee37352" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019e22b5-bcf3-7c4f-8de6-a0854f2feb89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e22b5-bcf3-784b-a878-74f2c7dce7c4" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019e22b5-bcf3-7c4f-8de6-a0854f2feb89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-789c-939f-b6f557c1a4f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7ba0-a5c2-3ceb178ba3d0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-789c-939f-b6f557c1a4f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf3-789c-939f-b6f557c1a4f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-789c-939f-b6f557c1a4f7" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf3-789c-939f-b6f557c1a4f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bcf3-786b-ac93-0824fb5ee914" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bcf3-789c-939f-b6f557c1a4f7" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bcf3-786b-ac93-0824fb5ee914" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyLiabilityMember_019e22b5-bcf3-727c-b7ff-22e9e6282725" xlink:href="all-20260630.xsd#all_PropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-786b-ac93-0824fb5ee914" xlink:to="loc_all_PropertyLiabilityMember_019e22b5-bcf3-727c-b7ff-22e9e6282725" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ProtectionServicesMember_019e22b5-bcf3-7440-acd8-fdc6f3917aa6" xlink:href="all-20260630.xsd#all_ProtectionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-786b-ac93-0824fb5ee914" xlink:to="loc_all_ProtectionServicesMember_019e22b5-bcf3-7440-acd8-fdc6f3917aa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf3-74d0-b5b1-1d1c00ba83a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bcf3-786b-ac93-0824fb5ee914" xlink:to="loc_us-gaap_CorporateAndOtherMember_019e22b5-bcf3-74d0-b5b1-1d1c00ba83a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-7e0c-8ecc-f8929f6bd013" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e22b5-bcf3-7ba0-a5c2-3ceb178ba3d0" xlink:to="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-7e0c-8ecc-f8929f6bd013" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-7e0c-8ecc-f8929f6bd013_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-7e0c-8ecc-f8929f6bd013" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-7e0c-8ecc-f8929f6bd013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-742d-981c-1301a2192871" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019e22b5-bcf3-7e0c-8ecc-f8929f6bd013" xlink:to="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-742d-981c-1301a2192871" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateProtectionMember_019e22b5-bcf3-7b36-8b81-7c5251f87acc" xlink:href="all-20260630.xsd#all_AllstateProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e22b5-bcf3-742d-981c-1301a2192871" xlink:to="loc_all_AllstateProtectionMember_019e22b5-bcf3-7b36-8b81-7c5251f87acc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e22b5-bcf3-75ab-a9ad-9e5bff857706" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7af8-93f9-0a44176dd82a" xlink:to="loc_us-gaap_Assets_019e22b5-bcf3-75ab-a9ad-9e5bff857706" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019e22b5-bcf3-7d41-9ff2-cf6645144695" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7af8-93f9-0a44176dd82a" xlink:to="loc_us-gaap_Investments_019e22b5-bcf3-7d41-9ff2-cf6645144695" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired_019e22b5-bcf3-7db0-952a-008de2b51a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e22b5-bcf3-7af8-93f9-0a44176dd82a" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired_019e22b5-bcf3-7db0-952a-008de2b51a4b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofAmortizedCostGrossUnrealizedGainsLossesandFairValueforFixedIncomeSecuritiesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofAmortizedCostGrossUnrealizedGainsLossesandFairValueforFixedIncomeSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofAmortizedCostGrossUnrealizedGainsLossesandFairValueforFixedIncomeSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70c8-a172-aed7ed5c84d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-70ba-bd1e-1ae3dfd1824c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70c8-a172-aed7ed5c84d7" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-70ba-bd1e-1ae3dfd1824c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7372-87fd-4dee58f33ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-70ba-bd1e-1ae3dfd1824c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7372-87fd-4dee58f33ca0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7372-87fd-4dee58f33ca0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7372-87fd-4dee58f33ca0" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7372-87fd-4dee58f33ca0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7372-87fd-4dee58f33ca0" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019e22b5-bcf3-74c3-853b-52d405a57dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019e22b5-bcf3-74c3-853b-52d405a57dcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-7c79-a69b-f5fbf47f58df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-7c79-a69b-f5fbf47f58df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-7626-b48d-a1d4846d2ac2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-7626-b48d-a1d4846d2ac2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019e22b5-bcf3-7a21-955a-d9e7bdd40e02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019e22b5-bcf3-7a21-955a-d9e7bdd40e02" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7220-9d36-c8029ccda354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7220-9d36-c8029ccda354" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-79a4-9cf8-3718ad353536" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7231-9d3b-1eea1dbf8487" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-79a4-9cf8-3718ad353536" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22b5-bcf3-7b6c-aab3-c3d719cbaa26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70c8-a172-aed7ed5c84d7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22b5-bcf3-7b6c-aab3-c3d719cbaa26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e22b5-bcf3-7b8e-9217-75e861e6602f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70c8-a172-aed7ed5c84d7" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019e22b5-bcf3-7b8e-9217-75e861e6602f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e22b5-bcf3-77f7-bd07-b0384bccd618" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70c8-a172-aed7ed5c84d7" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019e22b5-bcf3-77f7-bd07-b0384bccd618" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7f16-baad-2da6399551f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70c8-a172-aed7ed5c84d7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7f16-baad-2da6399551f8" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofNetInvestmentIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofNetInvestmentIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019e22b5-bcf3-78ae-aa74-b2a3c72c5b68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019e22b5-bcf3-780e-9d0a-3cc97e442dac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019e22b5-bcf3-78ae-aa74-b2a3c72c5b68" xlink:to="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019e22b5-bcf3-780e-9d0a-3cc97e442dac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7af7-9e49-58b73f4f5c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019e22b5-bcf3-780e-9d0a-3cc97e442dac" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7af7-9e49-58b73f4f5c1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7af7-9e49-58b73f4f5c1e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7af7-9e49-58b73f4f5c1e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7af7-9e49-58b73f4f5c1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7af7-9e49-58b73f4f5c1e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-75b0-b5a6-a70ea28700ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-75b0-b5a6-a70ea28700ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7860-8200-fce47a466bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7860-8200-fce47a466bd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019e22b5-bcf3-77ff-89f9-bc474a4904b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:to="loc_us-gaap_MortgagesMember_019e22b5-bcf3-77ff-89f9-bc474a4904b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_019e22b5-bcf3-75ce-bab9-bfc16a4fbea4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:to="loc_srt_PartnershipInterestMember_019e22b5-bcf3-75ce-bab9-bfc16a4fbea4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7daa-83ea-ad8c3753cde4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7daa-83ea-ad8c3753cde4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanSecuritiesInvestmentMember_019e22b5-bcf3-7b8b-86b9-2efd0fd2787e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherThanSecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7832-8708-2eb83c756f52" xlink:to="loc_us-gaap_OtherThanSecuritiesInvestmentMember_019e22b5-bcf3-7b8b-86b9-2efd0fd2787e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_019e22b5-bcf3-778a-be3d-c894d8ea2d35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019e22b5-bcf3-78ae-aa74-b2a3c72c5b68" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_019e22b5-bcf3-778a-be3d-c894d8ea2d35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e22b5-bcf3-70a3-9723-8d6522eb2c84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019e22b5-bcf3-78ae-aa74-b2a3c72c5b68" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e22b5-bcf3-70a3-9723-8d6522eb2c84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019e22b5-bcf3-7223-8b4f-37d51afe0b3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019e22b5-bcf3-78ae-aa74-b2a3c72c5b68" xlink:to="loc_us-gaap_NetInvestmentIncome_019e22b5-bcf3-7223-8b4f-37d51afe0b3a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofNetGainsLossesonInvestmentsandDerivativesbyAssetTypeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofNetGainsLossesonInvestmentsandDerivativesbyAssetTypeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofNetGainsLossesonInvestmentsandDerivativesbyAssetTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7a1a-83ac-10ec7c08214e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7adf-8cda-a425f05f30e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7a1a-83ac-10ec7c08214e" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7adf-8cda-a425f05f30e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-77b3-9455-a7331a2d2035" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7adf-8cda-a425f05f30e5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-77b3-9455-a7331a2d2035" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77b3-9455-a7331a2d2035_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-77b3-9455-a7331a2d2035" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77b3-9455-a7331a2d2035_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-77b3-9455-a7331a2d2035" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7f20-ad7d-cd6072387f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7f20-ad7d-cd6072387f6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7cee-bb11-b37190c72bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7cee-bb11-b37190c72bfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019f4ca4-e9de-778f-a8d2-5db364a47d94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:to="loc_us-gaap_MortgagesMember_019f4ca4-e9de-778f-a8d2-5db364a47d94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_019e22b5-bcf3-706f-84ef-b39be65d7ef9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:to="loc_srt_PartnershipInterestMember_019e22b5-bcf3-706f-84ef-b39be65d7ef9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_019e22b5-bcf3-743f-a453-335bb3f477df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:to="loc_us-gaap_DerivativeMember_019e22b5-bcf3-743f-a453-335bb3f477df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanSecuritiesInvestmentMember_019e22b5-bcf3-7271-9b18-d10e3a2b9277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherThanSecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7803-83a1-c43e80e2207c" xlink:to="loc_us-gaap_OtherThanSecuritiesInvestmentMember_019e22b5-bcf3-7271-9b18-d10e3a2b9277" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019f6e3f-550b-7649-8db0-1d1edb873c98" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7adf-8cda-a425f05f30e5" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019f6e3f-550b-7649-8db0-1d1edb873c98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019f6e3f-550b-7649-8db0-1d1edb873c98_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019f6e3f-550b-7649-8db0-1d1edb873c98" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019f6e3f-550b-7649-8db0-1d1edb873c98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019f6e3f-550b-7b6a-a1d6-3a6e66c4aa5b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019f6e3f-550b-7649-8db0-1d1edb873c98" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019f6e3f-550b-7b6a-a1d6-3a6e66c4aa5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019f7fab-0ec4-7a1a-ad34-b496762f99ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019f6e3f-550b-7b6a-a1d6-3a6e66c4aa5b" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019f7fab-0ec4-7a1a-ad34-b496762f99ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RealizedCapitalGainsLossesContinuingOperations_019e22b5-bcf3-7416-ae9c-e36bf5db0fd9" xlink:href="all-20260630.xsd#all_RealizedCapitalGainsLossesContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7a1a-83ac-10ec7c08214e" xlink:to="loc_all_RealizedCapitalGainsLossesContinuingOperations_019e22b5-bcf3-7416-ae9c-e36bf5db0fd9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofGrossRealizedGainsLossesonSalesofFixedIncomeSecuritiesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofGrossRealizedGainsLossesonSalesofFixedIncomeSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofGrossRealizedGainsLossesonSalesofFixedIncomeSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-793d-a9f8-06a668545fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-74db-8409-614a342a5da3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-793d-a9f8-06a668545fa9" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-74db-8409-614a342a5da3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7e6a-877d-b08a4d873c68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-74db-8409-614a342a5da3" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7e6a-877d-b08a4d873c68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7e6a-877d-b08a4d873c68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7e6a-877d-b08a4d873c68" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7e6a-877d-b08a4d873c68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7348-aa0b-4b61853550ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7e6a-877d-b08a4d873c68" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7348-aa0b-4b61853550ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-70c6-b0aa-891dcc0eb11c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7348-aa0b-4b61853550ff" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-70c6-b0aa-891dcc0eb11c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_019e22b5-bcf3-718b-8cfa-de8b1bff94bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-793d-a9f8-06a668545fa9" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_019e22b5-bcf3-718b-8cfa-de8b1bff94bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_019e22b5-bcf3-7098-b409-7094acc6821a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-793d-a9f8-06a668545fa9" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_019e22b5-bcf3-7098-b409-7094acc6821a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofNetAppreciationDeclineRecognizedinNetIncomeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofNetAppreciationDeclineRecognizedinNetIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofNetAppreciationDeclineRecognizedinNetIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-7f30-8043-d4e40a0adee1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-71d4-8e86-fbe3e00c2017" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-7f30-8043-d4e40a0adee1" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-71d4-8e86-fbe3e00c2017" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7d69-a8a9-e07bbafc018f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-71d4-8e86-fbe3e00c2017" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7d69-a8a9-e07bbafc018f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7d69-a8a9-e07bbafc018f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7d69-a8a9-e07bbafc018f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7d69-a8a9-e07bbafc018f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7521-bd89-c189d8bedd36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7d69-a8a9-e07bbafc018f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7521-bd89-c189d8bedd36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-79d0-a7f4-007ad5001f8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7521-bd89-c189d8bedd36" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-79d0-a7f4-007ad5001f8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_019e22b5-bcf3-7052-b97d-a8f10a54b304" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7521-bd89-c189d8bedd36" xlink:to="loc_srt_PartnershipInterestMember_019e22b5-bcf3-7052-b97d-a8f10a54b304" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RealizedGainLossFairValueRecognizedInNetIncome_019e22b5-bcf3-74c9-92e0-be5c3fa536ee" xlink:href="all-20260630.xsd#all_RealizedGainLossFairValueRecognizedInNetIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-7f30-8043-d4e40a0adee1" xlink:to="loc_all_RealizedGainLossFairValueRecognizedInNetIncome_019e22b5-bcf3-74c9-92e0-be5c3fa536ee" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofCreditLossesRecognizedinNetIncomeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofCreditLossesRecognizedinNetIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofCreditLossesRecognizedinNetIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherThanTemporaryImpairmentLossesByAssetTypeLineItems_019e22b5-bcf3-7086-b040-70dc63430d0b" xlink:href="all-20260630.xsd#all_OtherThanTemporaryImpairmentLossesByAssetTypeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-78b2-8a1d-558f240ebbc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_all_OtherThanTemporaryImpairmentLossesByAssetTypeLineItems_019e22b5-bcf3-7086-b040-70dc63430d0b" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-78b2-8a1d-558f240ebbc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7c79-a751-0932b966ab38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-78b2-8a1d-558f240ebbc6" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7c79-a751-0932b966ab38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7c79-a751-0932b966ab38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7c79-a751-0932b966ab38" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7c79-a751-0932b966ab38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7c79-a751-0932b966ab38" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7d23-b67b-2a5d8134a751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7d23-b67b-2a5d8134a751" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-72b0-b7a9-a22f16c72920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7d23-b67b-2a5d8134a751" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-72b0-b7a9-a22f16c72920" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_019e22b5-bcf3-7325-95d6-782ecda1c594" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:to="loc_srt_PartnershipInterestMember_019e22b5-bcf3-7325-95d6-782ecda1c594" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019f4ca1-d2ee-7e8d-964d-cfbfa4517563" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:to="loc_us-gaap_MortgagesMember_019f4ca1-d2ee-7e8d-964d-cfbfa4517563" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoansMember_019e22b5-bcf3-7e17-9822-54b1d050022f" xlink:href="all-20260630.xsd#all_BankLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:to="loc_all_BankLoansMember_019e22b5-bcf3-7e17-9822-54b1d050022f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAggregatedInvestmentsMember_019e22b5-bcf3-7c84-b60c-b4eeab301e84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAggregatedInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7300-a2a1-493d705477bb" xlink:to="loc_us-gaap_OtherAggregatedInvestmentsMember_019e22b5-bcf3-7c84-b60c-b4eeab301e84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllowanceForCreditLossCreditLossByAssetType_019e22b5-bcf3-7171-80bf-8516e785aa80" xlink:href="all-20260630.xsd#all_AllowanceForCreditLossCreditLossByAssetType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_OtherThanTemporaryImpairmentLossesByAssetTypeLineItems_019e22b5-bcf3-7086-b040-70dc63430d0b" xlink:to="loc_all_AllowanceForCreditLossCreditLossByAssetType_019e22b5-bcf3-7171-80bf-8516e785aa80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_UnfundedLoanCommitments_019e22b5-bcf3-76bd-927a-2e7858c0fbe2" xlink:href="all-20260630.xsd#all_UnfundedLoanCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_OtherThanTemporaryImpairmentLossesByAssetTypeLineItems_019e22b5-bcf3-7086-b040-70dc63430d0b" xlink:to="loc_all_UnfundedLoanCommitments_019e22b5-bcf3-76bd-927a-2e7858c0fbe2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllowanceForCreditLossCreditLossRecognizedInNetIncome_019e22b5-bcf3-78a3-a464-aff18a0f85f3" xlink:href="all-20260630.xsd#all_AllowanceForCreditLossCreditLossRecognizedInNetIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_OtherThanTemporaryImpairmentLossesByAssetTypeLineItems_019e22b5-bcf3-7086-b040-70dc63430d0b" xlink:to="loc_all_AllowanceForCreditLossCreditLossRecognizedInNetIncome_019e22b5-bcf3-78a3-a464-aff18a0f85f3" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofChangeinUnrealizedNetCapitalGainsLossesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofChangeinUnrealizedNetCapitalGainsLossesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofChangeinUnrealizedNetCapitalGainsLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_all_ChangeInUnrealizedGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bcf3-7575-b790-d181166a7210" xlink:href="all-20260630.xsd#all_ChangeInUnrealizedGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-77f5-b553-d2051019a920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_all_ChangeInUnrealizedGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bcf3-7575-b790-d181166a7210" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-77f5-b553-d2051019a920" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-75ab-bb4c-039242ead916" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-77f5-b553-d2051019a920" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-75ab-bb4c-039242ead916" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-75ab-bb4c-039242ead916_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-75ab-bb4c-039242ead916" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-75ab-bb4c-039242ead916_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b85-a5e5-04d9d9ecc853" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-75ab-bb4c-039242ead916" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b85-a5e5-04d9d9ecc853" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-78c6-a2f1-ac565cb7081c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b85-a5e5-04d9d9ecc853" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-78c6-a2f1-ac565cb7081c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7175-b59d-9b9b5513d1ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b85-a5e5-04d9d9ecc853" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7175-b59d-9b9b5513d1ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_019e22b5-bcf3-75d2-af8d-8a9ed225c93d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_ChangeInUnrealizedGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bcf3-7575-b790-d181166a7210" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_019e22b5-bcf3-75d2-af8d-8a9ed225c93d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AmountRecognizedInUnrealizedNetCapitalGainsAndLossesAbstract_019e22b5-bcf3-7957-809d-60a532e61794" xlink:href="all-20260630.xsd#all_AmountRecognizedInUnrealizedNetCapitalGainsAndLossesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_ChangeInUnrealizedGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bcf3-7575-b790-d181166a7210" xlink:to="loc_all_AmountRecognizedInUnrealizedNetCapitalGainsAndLossesAbstract_019e22b5-bcf3-7957-809d-60a532e61794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_019e22b5-bcf3-7d86-ae01-e3e8f46fa8ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_AmountRecognizedInUnrealizedNetCapitalGainsAndLossesAbstract_019e22b5-bcf3-7957-809d-60a532e61794" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_019e22b5-bcf3-7d86-ae01-e3e8f46fa8ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax_019e22b5-bcf3-75ab-8e45-2bb445fca2b9" xlink:href="all-20260630.xsd#all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_AmountRecognizedInUnrealizedNetCapitalGainsAndLossesAbstract_019e22b5-bcf3-7957-809d-60a532e61794" xlink:to="loc_all_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax_019e22b5-bcf3-75ab-8e45-2bb445fca2b9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofMortgageLoansNetofCreditAllowanceDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofMortgageLoansNetofCreditAllowanceDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofMortgageLoansNetofCreditAllowanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7620-a35f-bf1bdb834eef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7d9d-ac37-b7fccb59003c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7620-a35f-bf1bdb834eef" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7d9d-ac37-b7fccb59003c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-76c3-bae4-0c9cbbb1ed29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7d9d-ac37-b7fccb59003c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-76c3-bae4-0c9cbbb1ed29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-76c3-bae4-0c9cbbb1ed29_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-76c3-bae4-0c9cbbb1ed29" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-76c3-bae4-0c9cbbb1ed29_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-71a3-9e56-f969720ff482" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-76c3-bae4-0c9cbbb1ed29" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-71a3-9e56-f969720ff482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e22b5-bcf3-771c-a8b9-24aee912747f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-71a3-9e56-f969720ff482" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e22b5-bcf3-771c-a8b9-24aee912747f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e22b5-bcf3-7524-ab65-1f43b14b992a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-71a3-9e56-f969720ff482" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e22b5-bcf3-7524-ab65-1f43b14b992a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-7d4e-adc4-90bebe26deec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7620-a35f-bf1bdb834eef" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-7d4e-adc4-90bebe26deec" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofCarryingValueforLimitedPartnershipInterestsDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofCarryingValueforLimitedPartnershipInterestsDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofCarryingValueforLimitedPartnershipInterestsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-7116-a550-8aa5e21199b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-75b1-8dc3-346eacb4b96c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-7116-a550-8aa5e21199b4" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-75b1-8dc3-346eacb4b96c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7db0-b0a8-112d5712704f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-75b1-8dc3-346eacb4b96c" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7db0-b0a8-112d5712704f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7db0-b0a8-112d5712704f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7db0-b0a8-112d5712704f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7db0-b0a8-112d5712704f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-774d-b649-3a0b2c12505f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7db0-b0a8-112d5712704f" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-774d-b649-3a0b2c12505f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PrivateEquityMember_019e22b5-bcf3-7a85-8ebf-60b770791e9e" xlink:href="all-20260630.xsd#all_PrivateEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-774d-b649-3a0b2c12505f" xlink:to="loc_all_PrivateEquityMember_019e22b5-bcf3-7a85-8ebf-60b770791e9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e22b5-bcf3-7530-b9af-34c176774535" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-774d-b649-3a0b2c12505f" xlink:to="loc_us-gaap_RealEstateLoanMember_019e22b5-bcf3-7530-b9af-34c176774535" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherInvestmentAssetsMember_019e22c5-0ebc-7448-b646-d5b5e073bbd7" xlink:href="all-20260630.xsd#all_OtherInvestmentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-774d-b649-3a0b2c12505f" xlink:to="loc_all_OtherInvestmentAssetsMember_019e22c5-0ebc-7448-b646-d5b5e073bbd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_019e22b5-bcf3-723b-8272-03bb2a99efa4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-7116-a550-8aa5e21199b4" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_019e22b5-bcf3-723b-8272-03bb2a99efa4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsNarrativeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-7643-9f57-90c7b7a64536" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7f63-8a50-d198e4667d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-7643-9f57-90c7b7a64536" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7f63-8a50-d198e4667d1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7ded-8980-0936db9594c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7f63-8a50-d198e4667d1c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7ded-8980-0936db9594c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7ded-8980-0936db9594c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7ded-8980-0936db9594c5" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7ded-8980-0936db9594c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-740a-ac27-c5622cf71633" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7ded-8980-0936db9594c5" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-740a-ac27-c5622cf71633" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-79fa-bde3-a582c3790797" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-740a-ac27-c5622cf71633" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-79fa-bde3-a582c3790797" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherShortTermInvestments_019f660b-6563-7dbc-95ce-8a6fcfe62819" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-7643-9f57-90c7b7a64536" xlink:to="loc_us-gaap_OtherShortTermInvestments_019f660b-6563-7dbc-95ce-8a6fcfe62819" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_019e22b5-bcf3-7126-bc05-2b2718382534" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedInvestmentIncomeReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-7643-9f57-90c7b7a64536" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_019e22b5-bcf3-7126-bc05-2b2718382534" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofOtherInvestmentsbyAssetTypeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofOtherInvestmentsbyAssetTypeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofOtherInvestmentsbyAssetTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-751b-b3fb-db8b15163d90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019e22b5-bcf3-7ffa-b443-50c5a8f53f41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-751b-b3fb-db8b15163d90" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019e22b5-bcf3-7ffa-b443-50c5a8f53f41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7b36-aac0-60bc3c2b3b21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e22b5-bcf3-7ffa-b443-50c5a8f53f41" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7b36-aac0-60bc3c2b3b21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7b36-aac0-60bc3c2b3b21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7b36-aac0-60bc3c2b3b21" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7b36-aac0-60bc3c2b3b21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-767f-a509-71c7fd932fda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7b36-aac0-60bc3c2b3b21" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-767f-a509-71c7fd932fda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateLoanMember_019e22b5-bcf3-71fa-8264-90fe2caf32c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-767f-a509-71c7fd932fda" xlink:to="loc_us-gaap_RealEstateLoanMember_019e22b5-bcf3-71fa-8264-90fe2caf32c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoansMember_019e22b5-bcf3-7355-9610-039c9cb2c108" xlink:href="all-20260630.xsd#all_BankLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-767f-a509-71c7fd932fda" xlink:to="loc_all_BankLoansMember_019e22b5-bcf3-7355-9610-039c9cb2c108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherInvestmentAssetsMember_019e22c5-9433-7b7c-bf5f-04ea702f97e0" xlink:href="all-20260630.xsd#all_OtherInvestmentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-767f-a509-71c7fd932fda" xlink:to="loc_all_OtherInvestmentAssetsMember_019e22c5-9433-7b7c-bf5f-04ea702f97e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019e22b5-bcf3-7180-9441-9ffef457bf8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-751b-b3fb-db8b15163d90" xlink:to="loc_us-gaap_OtherInvestments_019e22b5-bcf3-7180-9441-9ffef457bf8e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofRollforwardofCreditLossAllowanceforFixedIncomeSecuritiesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofRollforwardofCreditLossAllowanceforFixedIncomeSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofRollforwardofCreditLossAllowanceforFixedIncomeSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-79c9-80ed-d1e8c9d4eb13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7f69-abce-a31a784493dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-79c9-80ed-d1e8c9d4eb13" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7f69-abce-a31a784493dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-78e3-89af-0755e6442937" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7f69-abce-a31a784493dd" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-78e3-89af-0755e6442937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-78e3-89af-0755e6442937_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-78e3-89af-0755e6442937" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-78e3-89af-0755e6442937_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77e9-9015-b4a347f32d3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-78e3-89af-0755e6442937" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77e9-9015-b4a347f32d3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7669-946b-c0aab060d377" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77e9-9015-b4a347f32d3e" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7669-946b-c0aab060d377" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-7146-87f6-633ace02ab87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77e9-9015-b4a347f32d3e" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-7146-87f6-633ace02ab87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7168-8aa3-a29b073fad47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-77e9-9015-b4a347f32d3e" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7168-8aa3-a29b073fad47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-79c4-afe3-30ea0e64844f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-79c9-80ed-d1e8c9d4eb13" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-79c4-afe3-30ea0e64844f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7249-8228-9ca257c88443" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-79c4-afe3-30ea0e64844f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7249-8228-9ca257c88443" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded_019e22b5-bcf3-702e-a5eb-68ffd724f3b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-79c4-afe3-30ea0e64844f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded_019e22b5-bcf3-702e-a5eb-68ffd724f3b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossPreviouslyRecorded_019e22b5-bcf3-7d8a-9732-040b28b50828" xlink:href="all-20260630.xsd#all_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossPreviouslyRecorded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-79c4-afe3-30ea0e64844f" xlink:to="loc_all_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossPreviouslyRecorded_019e22b5-bcf3-7d8a-9732-040b28b50828" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22b5-bcf3-78fa-ba45-eda1f4b893e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-79c4-afe3-30ea0e64844f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22b5-bcf3-78fa-ba45-eda1f4b893e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7477-8495-0f49a22074a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofGrossUnrealizedLossesandFairValuebyTypeandLengthofTimeHeldinaContinuousUnrealizedLossPositionDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofGrossUnrealizedLossesandFairValuebyTypeandLengthofTimeHeldinaContinuousUnrealizedLossPositionDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofGrossUnrealizedLossesandFairValuebyTypeandLengthofTimeHeldinaContinuousUnrealizedLossPositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7ac1-a30e-2d6603b30082" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7ac1-a30e-2d6603b30082" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-796f-8bd1-8d2324afbb61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019e22b5-bcf3-7ac1-a30e-2d6603b30082" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-796f-8bd1-8d2324afbb61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-796f-8bd1-8d2324afbb61_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-796f-8bd1-8d2324afbb61" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-796f-8bd1-8d2324afbb61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a45-bd44-e102c55f9c78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-796f-8bd1-8d2324afbb61" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a45-bd44-e102c55f9c78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a45-bd44-e102c55f9c78" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019e22b5-bcf3-789b-b888-3ac5d06ef012" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019e22b5-bcf3-789b-b888-3ac5d06ef012" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-76a1-81b0-e345acc2da5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-76a1-81b0-e345acc2da5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-7ab0-998a-9dee7578e057" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019e22b5-bcf3-7ab0-998a-9dee7578e057" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019e22b5-bcf3-7259-9ac5-2d56cb1d02e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019e22b5-bcf3-7259-9ac5-2d56cb1d02e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7f74-9100-127ba6b432e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7f74-9100-127ba6b432e9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-71e4-8ca2-2c78557b9998" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7b18-8f57-c57306db3b2f" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-71e4-8ca2-2c78557b9998" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_InvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7da2-9ebc-90856cb9842a" xlink:href="all-20260630.xsd#all_InvestmentGradeFixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a45-bd44-e102c55f9c78" xlink:to="loc_all_InvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7da2-9ebc-90856cb9842a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BelowInvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7f93-8c90-681dcdc04498" xlink:href="all-20260630.xsd#all_BelowInvestmentGradeFixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a45-bd44-e102c55f9c78" xlink:to="loc_all_BelowInvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7f93-8c90-681dcdc04498" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_LessThanTwelveMonthsAbstract_019e22b5-bcf3-74b4-ab22-fdc2be1b7e0f" xlink:href="all-20260630.xsd#all_LessThanTwelveMonthsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_all_LessThanTwelveMonthsAbstract_019e22b5-bcf3-74b4-ab22-fdc2be1b7e0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_019e22b5-bcf3-745e-a4e4-3c354806aeaa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LessThanTwelveMonthsAbstract_019e22b5-bcf3-74b4-ab22-fdc2be1b7e0f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_019e22b5-bcf3-745e-a4e4-3c354806aeaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019e22b5-bcf3-715b-921b-eeeb62677e08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LessThanTwelveMonthsAbstract_019e22b5-bcf3-74b4-ab22-fdc2be1b7e0f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019e22b5-bcf3-715b-921b-eeeb62677e08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019e22b5-bcf3-7735-9332-977c5839e538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LessThanTwelveMonthsAbstract_019e22b5-bcf3-74b4-ab22-fdc2be1b7e0f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019e22b5-bcf3-7735-9332-977c5839e538" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_TwelveMonthsOrMoreAbstract_019e22b5-bcf3-779b-83e5-9c6397365d6a" xlink:href="all-20260630.xsd#all_TwelveMonthsOrMoreAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_all_TwelveMonthsOrMoreAbstract_019e22b5-bcf3-779b-83e5-9c6397365d6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019e22b5-bcf3-7d42-9e60-c2488089cac2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_TwelveMonthsOrMoreAbstract_019e22b5-bcf3-779b-83e5-9c6397365d6a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019e22b5-bcf3-7d42-9e60-c2488089cac2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019e22b5-bcf3-726b-a9da-62d4d6f51272" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_TwelveMonthsOrMoreAbstract_019e22b5-bcf3-779b-83e5-9c6397365d6a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019e22b5-bcf3-726b-a9da-62d4d6f51272" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019e22b5-bcf3-7892-8a50-c27b9a5b190b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_TwelveMonthsOrMoreAbstract_019e22b5-bcf3-779b-83e5-9c6397365d6a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019e22b5-bcf3-7892-8a50-c27b9a5b190b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_TotalUnrealizedLossAbstract_019e22b5-bcf3-7e0a-baa8-253e50552063" xlink:href="all-20260630.xsd#all_TotalUnrealizedLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_all_TotalUnrealizedLossAbstract_019e22b5-bcf3-7e0a-baa8-253e50552063" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e22b5-bcf3-7f2a-a479-019089d6dc4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_TotalUnrealizedLossAbstract_019e22b5-bcf3-7e0a-baa8-253e50552063" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e22b5-bcf3-7f2a-a479-019089d6dc4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7968-9604-73d4c2fc2322" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7968-9604-73d4c2fc2322" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss_019e22b5-bcf3-7548-81eb-f603034fe845" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss_019e22b5-bcf3-7548-81eb-f603034fe845" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DebtSecuritiesAvailableForSaleAllowanceForCreditLossUnrealizedLossPositionExcludingAccruedInterest_019e22b5-bcf3-733f-9e58-d31bbb4bc337" xlink:href="all-20260630.xsd#all_DebtSecuritiesAvailableForSaleAllowanceForCreditLossUnrealizedLossPositionExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019e22b5-bcf3-7cd5-b647-6a2b5311da02" xlink:to="loc_all_DebtSecuritiesAvailableForSaleAllowanceForCreditLossUnrealizedLossPositionExcludingAccruedInterest_019e22b5-bcf3-733f-9e58-d31bbb4bc337" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofGrossUnrealizedLossesbyUnrealizedLossPositionandCreditQualityDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofGrossUnrealizedLossesbyUnrealizedLossPositionandCreditQualityDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofGrossUnrealizedLossesbyUnrealizedLossPositionandCreditQualityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-734e-be67-21c4ba501f91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019e22b5-bcf3-7bb8-8bf8-0dc1da8963e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-734e-be67-21c4ba501f91" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019e22b5-bcf3-7bb8-8bf8-0dc1da8963e1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7a27-8b80-b0560fb70103" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019e22b5-bcf3-7bb8-8bf8-0dc1da8963e1" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7a27-8b80-b0560fb70103" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a27-8b80-b0560fb70103_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7a27-8b80-b0560fb70103" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7a27-8b80-b0560fb70103_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7f39-9bb4-1ca630b6b5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7a27-8b80-b0560fb70103" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7f39-9bb4-1ca630b6b5a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_InvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7164-87a0-d709a36c551f" xlink:href="all-20260630.xsd#all_InvestmentGradeFixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7f39-9bb4-1ca630b6b5a6" xlink:to="loc_all_InvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7164-87a0-d709a36c551f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BelowInvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7058-aaba-a411b94395a0" xlink:href="all-20260630.xsd#all_BelowInvestmentGradeFixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7f39-9bb4-1ca630b6b5a6" xlink:to="loc_all_BelowInvestmentGradeFixedIncomeSecuritiesMember_019e22b5-bcf3-7058-aaba-a411b94395a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-78e5-a18a-845d864753fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7f39-9bb4-1ca630b6b5a6" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-78e5-a18a-845d864753fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent_019e22b5-bcf3-7493-a0a4-637b3ef50c2a" xlink:href="all-20260630.xsd#all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-734e-be67-21c4ba501f91" xlink:to="loc_all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent_019e22b5-bcf3-7493-a0a4-637b3ef50c2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher_019e22b5-bcf3-73f4-abd2-b5ac278d02c9" xlink:href="all-20260630.xsd#all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-734e-be67-21c4ba501f91" xlink:to="loc_all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher_019e22b5-bcf3-73f4-abd2-b5ac278d02c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e22b5-bcf3-7421-b395-034c89b407ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019e22b5-bcf3-734e-be67-21c4ba501f91" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019e22b5-bcf3-7421-b395-034c89b407ba" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofMortgageLoansAmortizedCostbyDebtServiceCoverageRatioDistributionandYearofOriginationDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofMortgageLoansAmortizedCostbyDebtServiceCoverageRatioDistributionandYearofOriginationDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofMortgageLoansAmortizedCostbyDebtServiceCoverageRatioDistributionandYearofOriginationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-72bc-bfc6-9289242edc24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7381-affd-9b347d07772e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-72bc-bfc6-9289242edc24" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7381-affd-9b347d07772e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_MortgageAcquisitionPeriodAxis_019e22b5-bcf3-7d20-839a-ef89d8641759" xlink:href="all-20260630.xsd#all_MortgageAcquisitionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7381-affd-9b347d07772e" xlink:to="loc_all_MortgageAcquisitionPeriodAxis_019e22b5-bcf3-7d20-839a-ef89d8641759" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7d20-839a-ef89d8641759_default" xlink:href="all-20260630.xsd#all_MortgageAcquisitionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_all_MortgageAcquisitionPeriodAxis_019e22b5-bcf3-7d20-839a-ef89d8641759" xlink:to="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7d20-839a-ef89d8641759_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:href="all-20260630.xsd#all_MortgageAcquisitionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_all_MortgageAcquisitionPeriodAxis_019e22b5-bcf3-7d20-839a-ef89d8641759" xlink:to="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2021AndPriorMember_019e22b5-bcf3-7750-84d9-8a5424f5669c" xlink:href="all-20260630.xsd#all_Acquisition2021AndPriorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:to="loc_all_Acquisition2021AndPriorMember_019e22b5-bcf3-7750-84d9-8a5424f5669c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2022Member_019e22b5-bcf3-7c52-a983-da1bc7362193" xlink:href="all-20260630.xsd#all_Acquisition2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:to="loc_all_Acquisition2022Member_019e22b5-bcf3-7c52-a983-da1bc7362193" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2023Member_019e22b5-bcf3-74c0-b7dc-67f6f18054b6" xlink:href="all-20260630.xsd#all_Acquisition2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:to="loc_all_Acquisition2023Member_019e22b5-bcf3-74c0-b7dc-67f6f18054b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2024Member_019e22b5-bcf3-7ab7-bdc5-161290bcc59a" xlink:href="all-20260630.xsd#all_Acquisition2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:to="loc_all_Acquisition2024Member_019e22b5-bcf3-7ab7-bdc5-161290bcc59a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2025Member_019e22b5-bcf3-7df3-a5d8-6a1534723308" xlink:href="all-20260630.xsd#all_Acquisition2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:to="loc_all_Acquisition2025Member_019e22b5-bcf3-7df3-a5d8-6a1534723308" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AcquisitionCurrentMember_019e22b5-bcf3-7f44-bcd0-a88e34db58c9" xlink:href="all-20260630.xsd#all_AcquisitionCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_MortgageAcquisitionPeriodDomain_019e22b5-bcf3-7961-af38-d747f3b37dd6" xlink:to="loc_all_AcquisitionCurrentMember_019e22b5-bcf3-7f44-bcd0-a88e34db58c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7134-8fd0-3ac92b49605a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7381-affd-9b347d07772e" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7134-8fd0-3ac92b49605a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7134-8fd0-3ac92b49605a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7134-8fd0-3ac92b49605a" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7134-8fd0-3ac92b49605a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7123-9037-6cc9198dde73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7134-8fd0-3ac92b49605a" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7123-9037-6cc9198dde73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019e22b5-bcf3-7d9f-a392-7dc6c00b2595" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7123-9037-6cc9198dde73" xlink:to="loc_us-gaap_MortgagesMember_019e22b5-bcf3-7d9f-a392-7dc6c00b2595" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_019e22b5-bcf3-796c-961d-34926e402ff5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7381-affd-9b347d07772e" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_019e22b5-bcf3-796c-961d-34926e402ff5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-796c-961d-34926e402ff5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_019e22b5-bcf3-796c-961d-34926e402ff5" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-796c-961d-34926e402ff5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-7b85-a2bd-cc375898ba9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_019e22b5-bcf3-796c-961d-34926e402ff5" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-7b85-a2bd-cc375898ba9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DebtServiceCoverageRatioBelow1.0To1.25Member_019e22b5-bcf3-7403-9261-07f7e5a85d5d" xlink:href="all-20260630.xsd#all_DebtServiceCoverageRatioBelow1.0To1.25Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-7b85-a2bd-cc375898ba9e" xlink:to="loc_all_DebtServiceCoverageRatioBelow1.0To1.25Member_019e22b5-bcf3-7403-9261-07f7e5a85d5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DebtServiceCoverageRatioBelow1.26To1.50Member_019e22b5-bcf3-7da9-9911-b932adf47cd1" xlink:href="all-20260630.xsd#all_DebtServiceCoverageRatioBelow1.26To1.50Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-7b85-a2bd-cc375898ba9e" xlink:to="loc_all_DebtServiceCoverageRatioBelow1.26To1.50Member_019e22b5-bcf3-7da9-9911-b932adf47cd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DebtServiceCoverageRatioAbove1.50Member_019e22b5-bcf3-75e1-a2b7-2a8d8358c328" xlink:href="all-20260630.xsd#all_DebtServiceCoverageRatioAbove1.50Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019e22b5-bcf3-7b85-a2bd-cc375898ba9e" xlink:to="loc_all_DebtServiceCoverageRatioAbove1.50Member_019e22b5-bcf3-75e1-a2b7-2a8d8358c328" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7680-8473-99fcc7d47a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7381-affd-9b347d07772e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7680-8473-99fcc7d47a0e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7680-8473-99fcc7d47a0e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7680-8473-99fcc7d47a0e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7680-8473-99fcc7d47a0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7057-af30-f65da8189624" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7680-8473-99fcc7d47a0e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7057-af30-f65da8189624" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e22b5-bcf3-7f13-a6c8-46797f723b0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7057-af30-f65da8189624" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e22b5-bcf3-7f13-a6c8-46797f723b0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22b5-bcf3-7314-bd35-dae56aa0bf48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-72bc-bfc6-9289242edc24" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22b5-bcf3-7314-bd35-dae56aa0bf48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForLoanAndLeaseLossesRealEstate_019e22b5-bcf3-71bb-a036-38be9093670d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForLoanAndLeaseLossesRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-72bc-bfc6-9289242edc24" xlink:to="loc_us-gaap_AllowanceForLoanAndLeaseLossesRealEstate_019e22b5-bcf3-71bb-a036-38be9093670d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-7c15-a0c9-3f10c6a63569" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-72bc-bfc6-9289242edc24" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-7c15-a0c9-3f10c6a63569" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofPaymentStatusofMortgageLoansDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofPaymentStatusofMortgageLoansDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofPaymentStatusofMortgageLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-741f-9f36-2018ae40c5c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7061-ab20-efe3c8218df8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-741f-9f36-2018ae40c5c5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7061-ab20-efe3c8218df8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7361-8ff1-5dcb88115e07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7061-ab20-efe3c8218df8" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7361-8ff1-5dcb88115e07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7361-8ff1-5dcb88115e07_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7361-8ff1-5dcb88115e07" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7361-8ff1-5dcb88115e07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-79ad-baa3-f8238f7c0f04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7361-8ff1-5dcb88115e07" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-79ad-baa3-f8238f7c0f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019e22b5-bcf3-7153-9b0f-709a8cb17f34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-79ad-baa3-f8238f7c0f04" xlink:to="loc_us-gaap_MortgagesMember_019e22b5-bcf3-7153-9b0f-709a8cb17f34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7401-b1a4-14b0338befd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7061-ab20-efe3c8218df8" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7401-b1a4-14b0338befd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7401-b1a4-14b0338befd4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7401-b1a4-14b0338befd4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7401-b1a4-14b0338befd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7265-a512-50b39fdf59f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019e22b5-bcf3-7401-b1a4-14b0338befd4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7265-a512-50b39fdf59f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019e22b5-bcf3-749d-be90-dfa106f142b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7265-a512-50b39fdf59f9" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019e22b5-bcf3-749d-be90-dfa106f142b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019e22b5-bcf3-7a69-b8a7-1e458f92833e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019e22b5-bcf3-7265-a512-50b39fdf59f9" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019e22b5-bcf3-7a69-b8a7-1e458f92833e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e22b5-bcf3-75c2-bd2d-4bbdf46bc683" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7061-ab20-efe3c8218df8" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e22b5-bcf3-75c2-bd2d-4bbdf46bc683" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-75c2-bd2d-4bbdf46bc683_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e22b5-bcf3-75c2-bd2d-4bbdf46bc683" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-75c2-bd2d-4bbdf46bc683_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-72e2-85de-c049002af88e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019e22b5-bcf3-75c2-bd2d-4bbdf46bc683" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-72e2-85de-c049002af88e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FinancialAssetLessThan90DaysPastDueMember_019e22b5-bcf3-7064-a3f6-6497c898f5dd" xlink:href="all-20260630.xsd#all_FinancialAssetLessThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-72e2-85de-c049002af88e" xlink:to="loc_all_FinancialAssetLessThan90DaysPastDueMember_019e22b5-bcf3-7064-a3f6-6497c898f5dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019e22b5-bcf3-751e-9b8f-a683c258a5ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-72e2-85de-c049002af88e" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019e22b5-bcf3-751e-9b8f-a683c258a5ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_019e22b5-bcf3-727e-9387-2349af59a200" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-72e2-85de-c049002af88e" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_019e22b5-bcf3-727e-9387-2349af59a200" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_019e22b5-bcf3-7f42-adcc-1362cd614a72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019e22b5-bcf3-72e2-85de-c049002af88e" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_019e22b5-bcf3-7f42-adcc-1362cd614a72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22b5-bcf3-790a-93d6-826a5fd9440e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-741f-9f36-2018ae40c5c5" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22b5-bcf3-790a-93d6-826a5fd9440e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-71f5-b19b-db1f589be869" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-741f-9f36-2018ae40c5c5" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-71f5-b19b-db1f589be869" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22b5-bcf3-7f7e-970b-725bc67911c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-741f-9f36-2018ae40c5c5" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019e22b5-bcf3-7f7e-970b-725bc67911c5" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofRollforwardofCreditLossAllowanceforMortgageLoansDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofRollforwardofCreditLossAllowanceforMortgageLoansDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofRollforwardofCreditLossAllowanceforMortgageLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-737b-be36-373bd2aa4a8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7b53-88d4-4cdfaa1a5a34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-737b-be36-373bd2aa4a8b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7b53-88d4-4cdfaa1a5a34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-70b0-99c0-70989ddf77e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7b53-88d4-4cdfaa1a5a34" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-70b0-99c0-70989ddf77e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-70b0-99c0-70989ddf77e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-70b0-99c0-70989ddf77e7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-70b0-99c0-70989ddf77e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7624-b238-b53a7de67d4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-70b0-99c0-70989ddf77e7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7624-b238-b53a7de67d4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019e22b5-bcf3-7194-a93b-a2f13ad2e206" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7624-b238-b53a7de67d4c" xlink:to="loc_us-gaap_MortgagesMember_019e22b5-bcf3-7194-a93b-a2f13ad2e206" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialLoanMember_019e22b5-bcf3-7cbf-96d3-13d62a643f8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7624-b238-b53a7de67d4c" xlink:to="loc_us-gaap_CommercialLoanMember_019e22b5-bcf3-7cbf-96d3-13d62a643f8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019e22b5-bcf3-7d0f-81b1-7ccb358f8daa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7624-b238-b53a7de67d4c" xlink:to="loc_us-gaap_ResidentialMortgageMember_019e22b5-bcf3-7d0f-81b1-7ccb358f8daa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-7c3c-9e14-3e76d5ee3e6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-737b-be36-373bd2aa4a8b" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-7c3c-9e14-3e76d5ee3e6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7df7-b7be-bcadd3de88b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-7c3c-9e14-3e76d5ee3e6e" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7df7-b7be-bcadd3de88b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_019e22b5-bcf3-7dd1-a877-37298bb33732" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-7c3c-9e14-3e76d5ee3e6e" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_019e22b5-bcf3-7dd1-a877-37298bb33732" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22b5-bcf3-7bd6-a3ed-275d566c5658" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-7c3c-9e14-3e76d5ee3e6e" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22b5-bcf3-7bd6-a3ed-275d566c5658" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7ac3-82f5-bda88d0fdb4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofBankLoansAmortizedCostbyCreditRatingandYearofOriginationDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofBankLoansAmortizedCostbyCreditRatingandYearofOriginationDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofBankLoansAmortizedCostbyCreditRatingandYearofOriginationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70f1-a649-535025cb7b5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7652-a60c-c01f49a5a304" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70f1-a649-535025cb7b5d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7652-a60c-c01f49a5a304" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoanAcquisitionPeriodAxis_019e22b5-bcf3-70b8-98ef-bb9f8bd1f649" xlink:href="all-20260630.xsd#all_BankLoanAcquisitionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7652-a60c-c01f49a5a304" xlink:to="loc_all_BankLoanAcquisitionPeriodAxis_019e22b5-bcf3-70b8-98ef-bb9f8bd1f649" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-70b8-98ef-bb9f8bd1f649_default" xlink:href="all-20260630.xsd#all_BankLoanAcquisitionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_all_BankLoanAcquisitionPeriodAxis_019e22b5-bcf3-70b8-98ef-bb9f8bd1f649" xlink:to="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-70b8-98ef-bb9f8bd1f649_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:href="all-20260630.xsd#all_BankLoanAcquisitionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_all_BankLoanAcquisitionPeriodAxis_019e22b5-bcf3-70b8-98ef-bb9f8bd1f649" xlink:to="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2021AndPriorMember_019e22b5-bcf3-7e0a-8819-bb5fb11fd583" xlink:href="all-20260630.xsd#all_Acquisition2021AndPriorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:to="loc_all_Acquisition2021AndPriorMember_019e22b5-bcf3-7e0a-8819-bb5fb11fd583" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2022Member_019e22b5-bcf3-7b40-b962-2acc7ba32afa" xlink:href="all-20260630.xsd#all_Acquisition2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:to="loc_all_Acquisition2022Member_019e22b5-bcf3-7b40-b962-2acc7ba32afa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2023Member_019e22b5-bcf3-70ca-aad9-1ce24ca624cd" xlink:href="all-20260630.xsd#all_Acquisition2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:to="loc_all_Acquisition2023Member_019e22b5-bcf3-70ca-aad9-1ce24ca624cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2024Member_019e22b5-bcf3-7507-9700-5870515bbab6" xlink:href="all-20260630.xsd#all_Acquisition2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:to="loc_all_Acquisition2024Member_019e22b5-bcf3-7507-9700-5870515bbab6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_Acquisition2025Member_019e22b5-bcf3-7f00-a3f9-c0b757f32ab6" xlink:href="all-20260630.xsd#all_Acquisition2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:to="loc_all_Acquisition2025Member_019e22b5-bcf3-7f00-a3f9-c0b757f32ab6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AcquisitionCurrentMember_019e22b5-bcf3-74da-ba5c-75741059adea" xlink:href="all-20260630.xsd#all_AcquisitionCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_BankLoanAcquisitionPeriodDomain_019e22b5-bcf3-7989-a10f-1a66db5c0e73" xlink:to="loc_all_AcquisitionCurrentMember_019e22b5-bcf3-74da-ba5c-75741059adea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7763-b296-2902a3093973" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CreditRatingStandardPoorsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7652-a60c-c01f49a5a304" xlink:to="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7763-b296-2902a3093973" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7763-b296-2902a3093973_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7763-b296-2902a3093973" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7763-b296-2902a3093973_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7763-b296-2902a3093973" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsARatingMember_019e22b5-bcf3-768d-9301-6a4ae69652d3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:to="loc_srt_StandardPoorsARatingMember_019e22b5-bcf3-768d-9301-6a4ae69652d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsBBBRatingMember_019e22b5-bcf3-7de9-a6fb-3a8a97d17dbe" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsBBBRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:to="loc_srt_StandardPoorsBBBRatingMember_019e22b5-bcf3-7de9-a6fb-3a8a97d17dbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsBBRatingMember_019e22b5-bcf3-78e7-abe2-9c9f3ad45da2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsBBRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:to="loc_srt_StandardPoorsBBRatingMember_019e22b5-bcf3-78e7-abe2-9c9f3ad45da2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsBRatingMember_019e22b5-bcf3-7e32-8235-163b09a628c5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsBRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:to="loc_srt_StandardPoorsBRatingMember_019e22b5-bcf3-7e32-8235-163b09a628c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsCCCMinusRatingMember_019e22b5-bcf3-7037-b158-74af6ec55ab7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsCCCMinusRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-70de-94b9-a840abde8a25" xlink:to="loc_srt_StandardPoorsCCCMinusRatingMember_019e22b5-bcf3-7037-b158-74af6ec55ab7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-74b8-a890-d66d86580375" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019e22b5-bcf3-7652-a60c-c01f49a5a304" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-74b8-a890-d66d86580375" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-74b8-a890-d66d86580375_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-74b8-a890-d66d86580375" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-74b8-a890-d66d86580375_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7b9c-9243-edf016d89b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-74b8-a890-d66d86580375" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7b9c-9243-edf016d89b1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoansMember_019e22b5-bcf3-75d0-80e2-2ae3154d0930" xlink:href="all-20260630.xsd#all_BankLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7b9c-9243-edf016d89b1c" xlink:to="loc_all_BankLoansMember_019e22b5-bcf3-75d0-80e2-2ae3154d0930" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22b5-bcf3-7869-8e87-29e996cf7467" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70f1-a649-535025cb7b5d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019e22b5-bcf3-7869-8e87-29e996cf7467" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForLoanAndLeaseLossesRealEstate_019e22b5-bcf3-78c0-b30c-07976a9e718b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForLoanAndLeaseLossesRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70f1-a649-535025cb7b5d" xlink:to="loc_us-gaap_AllowanceForLoanAndLeaseLossesRealEstate_019e22b5-bcf3-78c0-b30c-07976a9e718b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-721c-a71b-20c91885b693" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019e22b5-bcf3-70f1-a649-535025cb7b5d" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-721c-a71b-20c91885b693" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/InvestmentsScheduleofRollforwardofCreditLossAllowanceforBankLoansDetails" xlink:type="simple" xlink:href="all-20260630.xsd#InvestmentsScheduleofRollforwardofCreditLossAllowanceforBankLoansDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/InvestmentsScheduleofRollforwardofCreditLossAllowanceforBankLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-76e2-825d-e3243873d1ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7eca-bfbb-a284f7ea5baa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-76e2-825d-e3243873d1ed" xlink:to="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7eca-bfbb-a284f7ea5baa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75e9-b9ba-c99f69e210ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable_019e22b5-bcf3-7eca-bfbb-a284f7ea5baa" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75e9-b9ba-c99f69e210ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-75e9-b9ba-c99f69e210ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75e9-b9ba-c99f69e210ec" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-75e9-b9ba-c99f69e210ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7444-a6ad-fa80f5f13689" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75e9-b9ba-c99f69e210ec" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7444-a6ad-fa80f5f13689" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoansMember_019e22b5-bcf3-7637-bce4-27a207f2173c" xlink:href="all-20260630.xsd#all_BankLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7444-a6ad-fa80f5f13689" xlink:to="loc_all_BankLoansMember_019e22b5-bcf3-7637-bce4-27a207f2173c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-788c-8beb-c7c1284fa39a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems_019e22b5-bcf3-76e2-825d-e3243873d1ed" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-788c-8beb-c7c1284fa39a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7428-a258-671f3f14a7ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-788c-8beb-c7c1284fa39a" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-7428-a258-671f3f14a7ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_019e22b5-bcf3-7df6-b962-d6199c450675" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-788c-8beb-c7c1284fa39a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_019e22b5-bcf3-7df6-b962-d6199c450675" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22b5-bcf3-71ef-95f9-5faea9ed03cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward_019e22b5-bcf3-788c-8beb-c7c1284fa39a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019e22b5-bcf3-71ef-95f9-5faea9ed03cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019e22b5-bcf3-79c7-8f42-2d95c1c8979e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesNarrativeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e22b5-bcf3-7f50-95b6-0f6c3df54491" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:to="loc_srt_RangeAxis_019e22b5-bcf3-7f50-95b6-0f6c3df54491" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e22b5-bcf3-7f50-95b6-0f6c3df54491_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e22b5-bcf3-7f50-95b6-0f6c3df54491" xlink:to="loc_srt_RangeMember_019e22b5-bcf3-7f50-95b6-0f6c3df54491_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e22b5-bcf3-7936-b3df-76ca6067bc10" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e22b5-bcf3-7f50-95b6-0f6c3df54491" xlink:to="loc_srt_RangeMember_019e22b5-bcf3-7936-b3df-76ca6067bc10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e22b5-bcf3-7a82-bada-8b9f3cc93610" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e22b5-bcf3-7936-b3df-76ca6067bc10" xlink:to="loc_srt_MinimumMember_019e22b5-bcf3-7a82-bada-8b9f3cc93610" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e22b5-bcf3-7c51-8f0d-1ed23f88339d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e22b5-bcf3-7936-b3df-76ca6067bc10" xlink:to="loc_srt_MaximumMember_019e22b5-bcf3-7c51-8f0d-1ed23f88339d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7843-8597-617b3d8aaa05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7843-8597-617b3d8aaa05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7843-8597-617b3d8aaa05_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7843-8597-617b3d8aaa05" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7843-8597-617b3d8aaa05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b80-9433-af91eb95b621" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7843-8597-617b3d8aaa05" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b80-9433-af91eb95b621" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_019e22b5-bcf3-700d-a406-40f31e0bf769" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7b80-9433-af91eb95b621" xlink:to="loc_srt_PartnershipInterestMember_019e22b5-bcf3-700d-a406-40f31e0bf769" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-77a5-a292-9b89d6fa3e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-77a5-a292-9b89d6fa3e9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-77a5-a292-9b89d6fa3e9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-77a5-a292-9b89d6fa3e9d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-77a5-a292-9b89d6fa3e9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7d2f-8551-2255d0fa2be9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-77a5-a292-9b89d6fa3e9d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7d2f-8551-2255d0fa2be9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e22b5-bcf3-718f-9b80-ad68a9345022" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7d2f-8551-2255d0fa2be9" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e22b5-bcf3-718f-9b80-ad68a9345022" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7405-ac7a-445cfb204097" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7405-ac7a-445cfb204097" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7405-ac7a-445cfb204097_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7405-ac7a-445cfb204097" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7405-ac7a-445cfb204097_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7df7-a11e-0a92800d0def" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7405-ac7a-445cfb204097" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7df7-a11e-0a92800d0def" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019e22b5-bcf3-70b4-a076-68949769f799" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7df7-a11e-0a92800d0def" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019e22b5-bcf3-70b4-a076-68949769f799" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75d5-a73d-a507ecedf0ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-71e1-acdc-03fa6798dca4" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75d5-a73d-a507ecedf0ef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-75d5-a73d-a507ecedf0ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75d5-a73d-a507ecedf0ef" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-75d5-a73d-a507ecedf0ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7c3c-9b1a-0cf6d09fe1dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-75d5-a73d-a507ecedf0ef" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7c3c-9b1a-0cf6d09fe1dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FixedIncomeSecuritiesValuedBasedOnNonbindingBrokerQuotesMember_019e22b5-bcf3-7097-8b7f-7a00ca299f0f" xlink:href="all-20260630.xsd#all_FixedIncomeSecuritiesValuedBasedOnNonbindingBrokerQuotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7c3c-9b1a-0cf6d09fe1dd" xlink:to="loc_all_FixedIncomeSecuritiesValuedBasedOnNonbindingBrokerQuotesMember_019e22b5-bcf3-7097-8b7f-7a00ca299f0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_MunicipalNotRatedByThirdPartyCreditRatingAgenciesMember_019e22b5-bcf3-74c8-b27c-104fcfe7709a" xlink:href="all-20260630.xsd#all_MunicipalNotRatedByThirdPartyCreditRatingAgenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7c3c-9b1a-0cf6d09fe1dd" xlink:to="loc_all_MunicipalNotRatedByThirdPartyCreditRatingAgenciesMember_019e22b5-bcf3-74c8-b27c-104fcfe7709a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_InvestmentAssetsUsefulLife_019e22b5-bcf3-7535-997a-3e35cbbe5c5d" xlink:href="all-20260630.xsd#all_InvestmentAssetsUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:to="loc_all_InvestmentAssetsUsefulLife_019e22b5-bcf3-7535-997a-3e35cbbe5c5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CommitmentsToInvestInLimitedPartnershipInterests_019e22b5-bcf3-76d4-bf43-13145c48ad63" xlink:href="all-20260630.xsd#all_CommitmentsToInvestInLimitedPartnershipInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:to="loc_all_CommitmentsToInvestInLimitedPartnershipInterests_019e22b5-bcf3-76d4-bf43-13145c48ad63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7141-bd61-440f2771b2ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7141-bd61-440f2771b2ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DebtSecuritiesAvailableForSaleExcludingAccruedInterestThirdPartyDiscountedCashFlowModels_019e22b5-bcf3-77c0-bfb0-31cd332d166d" xlink:href="all-20260630.xsd#all_DebtSecuritiesAvailableForSaleExcludingAccruedInterestThirdPartyDiscountedCashFlowModels"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:to="loc_all_DebtSecuritiesAvailableForSaleExcludingAccruedInterestThirdPartyDiscountedCashFlowModels_019e22b5-bcf3-77c0-bfb0-31cd332d166d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019e22b5-bcf3-73cf-b236-47f639ac2b93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-78a7-99f5-2a0789aeb1b1" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019e22b5-bcf3-73cf-b236-47f639ac2b93" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofAssetsandLiabilitiesMeasuredatFairValueDetails" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesScheduleofAssetsandLiabilitiesMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofAssetsandLiabilitiesMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-755c-8a83-7bef07785b65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-755c-8a83-7bef07785b65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7b8c-9a56-24e8e89f0b41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-755c-8a83-7bef07785b65" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7b8c-9a56-24e8e89f0b41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b8c-9a56-24e8e89f0b41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7b8c-9a56-24e8e89f0b41" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b8c-9a56-24e8e89f0b41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b61-836a-4ab76accbc52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7b8c-9a56-24e8e89f0b41" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b61-836a-4ab76accbc52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e22b5-bcf3-7628-94b4-57a8d3f9fb5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b61-836a-4ab76accbc52" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e22b5-bcf3-7628-94b4-57a8d3f9fb5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e22b5-bcf3-7916-8584-bcb1209225bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b61-836a-4ab76accbc52" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e22b5-bcf3-7916-8584-bcb1209225bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e22b5-bcf3-7930-900d-288a910b80f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b61-836a-4ab76accbc52" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e22b5-bcf3-7930-900d-288a910b80f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e22b5-bcf3-7c1e-8883-486009faea2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7b61-836a-4ab76accbc52" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e22b5-bcf3-7c1e-8883-486009faea2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7a5a-b9cf-4a6ee9ebd773" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-755c-8a83-7bef07785b65" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7a5a-b9cf-4a6ee9ebd773" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7a5a-b9cf-4a6ee9ebd773_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7a5a-b9cf-4a6ee9ebd773" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-7a5a-b9cf-4a6ee9ebd773_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-75af-a1c8-8bf39acf5728" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019e22b5-bcf3-7a5a-b9cf-4a6ee9ebd773" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-75af-a1c8-8bf39acf5728" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019e22b5-bcf3-7a84-ab68-b62c4969564f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-75af-a1c8-8bf39acf5728" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019e22b5-bcf3-7a84-ab68-b62c4969564f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019e22b5-bcf3-7df1-8b2c-d9cc758784d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019e22b5-bcf3-75af-a1c8-8bf39acf5728" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_019e22b5-bcf3-7df1-8b2c-d9cc758784d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7afe-b36a-2201dc9d3981" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e22b5-bcf3-755c-8a83-7bef07785b65" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7afe-b36a-2201dc9d3981" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7afe-b36a-2201dc9d3981_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7afe-b36a-2201dc9d3981" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-7afe-b36a-2201dc9d3981_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019e22b5-bcf3-7afe-b36a-2201dc9d3981" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019e22b5-bcf3-7f88-8543-fbde563457a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019e22b5-bcf3-7f88-8543-fbde563457a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-783c-a5eb-f3f56ae77a5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-783c-a5eb-f3f56ae77a5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-7b71-b889-ce28ce31f88c" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPublicMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-7b71-b889-ce28ce31f88c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-74eb-8e10-ad7eb6f4ce04" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-74eb-8e10-ad7eb6f4ce04" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019e22b5-bcf3-7951-9dba-efcba82c0497" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019e22b5-bcf3-7951-9dba-efcba82c0497" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7168-a747-39f03181c890" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7168-a747-39f03181c890" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-701b-9cf4-df05c5395352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019e22b5-bcf3-71e4-8a8c-e54ecdae5368" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-701b-9cf4-df05c5395352" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7a63-8f11-ade557c0571b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bcf3-7a63-8f11-ade557c0571b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019e22b5-bcf3-7419-b5d1-e9ef23659fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019e22b5-bcf3-7419-b5d1-e9ef23659fa0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherShortTermInvestments_019e22b5-bcf3-7d81-be80-427c214c0d87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_OtherShortTermInvestments_019e22b5-bcf3-7d81-be80-427c214c0d87" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019e22b5-bcf3-7e6f-b66e-1f9ffab31873" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_OtherInvestments_019e22b5-bcf3-7e6f-b66e-1f9ffab31873" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherInvestmentsGrossAssetAndRightToReclaimCashOffset_019e22b5-bcf3-7a3f-874f-43d67da48095" xlink:href="all-20260630.xsd#all_OtherInvestmentsGrossAssetAndRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_all_OtherInvestmentsGrossAssetAndRightToReclaimCashOffset_019e22b5-bcf3-7a3f-874f-43d67da48095" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_019e22b5-bcf3-78b6-bac8-c7e9d0f9620f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_019e22b5-bcf3-78b6-bac8-c7e9d0f9620f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019e22b5-bcf3-757f-8b3d-6b70ae14a393" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019e22b5-bcf3-757f-8b3d-6b70ae14a393" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DerivativeAssetNetOfOffsetsAndSecuritiesCollateral_019e22b5-bcf3-7641-8b1c-4c62b454d609" xlink:href="all-20260630.xsd#all_DerivativeAssetNetOfOffsetsAndSecuritiesCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_all_DerivativeAssetNetOfOffsetsAndSecuritiesCollateral_019e22b5-bcf3-7641-8b1c-4c62b454d609" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019e22b5-bcf3-7d43-a227-82b68a870b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AlternativeInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_AlternativeInvestment_019e22b5-bcf3-7d43-a227-82b68a870b4f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019e22b5-bcf3-7f25-b1c8-bd927e88a079" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-7025-9e69-e2a76bef1f5d" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019e22b5-bcf3-7f25-b1c8-bd927e88a079" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e22b5-bcf3-7e63-9329-848740dc801f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e22b5-bcf3-7e63-9329-848740dc801f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019e22b5-bcf3-7233-ac35-06c7448160c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e22b5-bcf3-7e63-9329-848740dc801f" xlink:to="loc_us-gaap_OtherLiabilities_019e22b5-bcf3-7233-ac35-06c7448160c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherLiabilitiesCounterpartyNettingAndCollateralRightToReclaimCashOffset_019e22b5-bcf3-766e-9410-6a8f861e1cce" xlink:href="all-20260630.xsd#all_OtherLiabilitiesCounterpartyNettingAndCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e22b5-bcf3-7e63-9329-848740dc801f" xlink:to="loc_all_OtherLiabilitiesCounterpartyNettingAndCollateralRightToReclaimCashOffset_019e22b5-bcf3-766e-9410-6a8f861e1cce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DerivativeLiabilityCounterpartyNettingAndCollateralRightToReclaimCashOffset_019e22b5-bcf3-7b84-bdef-a88cca0bf660" xlink:href="all-20260630.xsd#all_DerivativeLiabilityCounterpartyNettingAndCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e22b5-bcf3-7e63-9329-848740dc801f" xlink:to="loc_all_DerivativeLiabilityCounterpartyNettingAndCollateralRightToReclaimCashOffset_019e22b5-bcf3-7b84-bdef-a88cca0bf660" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019e22b5-bcf3-7292-9167-2ae502a345b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019e22b5-bcf3-7e63-9329-848740dc801f" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019e22b5-bcf3-7292-9167-2ae502a345b5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PreferredStockMeasuredAtCost_019e22b5-bcf3-769b-a6b7-cf080e89d388" xlink:href="all-20260630.xsd#all_PreferredStockMeasuredAtCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_all_PreferredStockMeasuredAtCost_019e22b5-bcf3-769b-a6b7-cf080e89d388" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019e22b5-bcf3-783d-86b6-f306b4ed1a16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_us-gaap_EquityMethodInvestments_019e22b5-bcf3-783d-86b6-f306b4ed1a16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCost_019e22b5-bcf3-7e42-8744-fa383d9c9087" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCost_019e22b5-bcf3-7e42-8744-fa383d9c9087" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestInLimitedPartnerships_019e22b5-bcf3-7c5c-8790-5f36bbeb6414" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestInLimitedPartnerships"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e22b5-bcf3-7007-a097-413a95bba975" xlink:to="loc_us-gaap_MinorityInterestInLimitedPartnerships_019e22b5-bcf3-7c5c-8790-5f36bbeb6414" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofRollforwardofLevel3AssetsandLiabilitiesHeldatFairValueDetails" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesScheduleofRollforwardofLevel3AssetsandLiabilitiesHeldatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofRollforwardofLevel3AssetsandLiabilitiesHeldatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e22b5-bcf3-72ca-b723-0f1fd55ea066" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e22b5-bcf3-72ca-b723-0f1fd55ea066" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-7816-91d5-9076534951f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-7816-91d5-9076534951f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-71f3-97d5-50669b86f408" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPublicMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-71f3-97d5-50669b86f408" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-7c63-8bd5-a91768dcc224" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-7c63-8bd5-a91768dcc224" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7216-beb6-1bf7c48cc02b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7216-beb6-1bf7c48cc02b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-758d-99bd-7a990e568e63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-758d-99bd-7a990e568e63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-74d6-a00c-12c4da99b34a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-74d6-a00c-12c4da99b34a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7120-b061-4b77bf5c7b63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7120-b061-4b77bf5c7b63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherInvestmentAssetsMember_019e22c2-b2a4-7c3b-b355-c2c44d1e5be1" xlink:href="all-20260630.xsd#all_OtherInvestmentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_all_OtherInvestmentAssetsMember_019e22c2-b2a4-7c3b-b355-c2c44d1e5be1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherAssetClassMember_019e22c2-6feb-798a-bff5-77a764343515" xlink:href="all-20260630.xsd#all_OtherAssetClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_all_OtherAssetClassMember_019e22c2-6feb-798a-bff5-77a764343515" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AssetsHeldForSaleMember_019e22b5-bcf3-7b8e-b18c-01798adbf2bd" xlink:href="all-20260630.xsd#all_AssetsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_all_AssetsHeldForSaleMember_019e22b5-bcf3-7b8e-b18c-01798adbf2bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-731e-8ff5-2a3149977b59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-731e-8ff5-2a3149977b59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-7911-bfe4-51f73caeb9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-7911-bfe4-51f73caeb9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherLiabilityClassMember_019e22c4-3c62-76e7-b32f-ee1d01dc7283" xlink:href="all-20260630.xsd#all_OtherLiabilityClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-7911-bfe4-51f73caeb9f3" xlink:to="loc_all_OtherLiabilityClassMember_019e22c4-3c62-76e7-b32f-ee1d01dc7283" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bcf3-70b8-92fc-4d5ed512889f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bcf3-70b8-92fc-4d5ed512889f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e22b5-bcf3-72ca-b723-0f1fd55ea066" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e22b5-bcf3-7203-a113-d2368a99d1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e22b5-bcf3-7203-a113-d2368a99d1cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019e22b5-bcf3-7c8d-9c11-bced85e10f88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019e22b5-bcf3-7c8d-9c11-bced85e10f88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019e22b5-bcf3-78f1-b1ce-c7f17643fff5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019e22b5-bcf3-78f1-b1ce-c7f17643fff5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019e22b5-bcf3-7938-8f6f-c75215f2a1fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019e22b5-bcf3-7938-8f6f-c75215f2a1fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019e22b5-bcf3-77c7-bb6d-0baba97f1a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019e22b5-bcf3-77c7-bb6d-0baba97f1a4e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019e22b5-bcf3-7fb1-aaab-d464529b810a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019e22b5-bcf3-7fb1-aaab-d464529b810a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019e22b5-bcf3-71cd-914c-a025bc7cf35b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019e22b5-bcf3-71cd-914c-a025bc7cf35b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019e22b5-bcf3-7044-81f0-dd159b149810" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019e22b5-bcf3-7044-81f0-dd159b149810" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e22b5-bcf3-7782-8317-403cec82b669" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019e22b5-bcf3-72ec-a02d-3cc53beb7cea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019e22b5-bcf3-72ec-a02d-3cc53beb7cea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019e22b5-bcf3-7597-bbf0-a50b2cc5e209" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019e22b5-bcf3-7597-bbf0-a50b2cc5e209" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019e22b5-bcf3-7f27-b2c9-9b92f4f9ebad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019e22b5-bcf3-7f27-b2c9-9b92f4f9ebad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019e22b5-bcf3-7007-a291-2846ce23f59a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019e22b5-bcf3-7007-a291-2846ce23f59a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019e22b5-bcf3-75c3-8628-0815f256dd98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019e22b5-bcf3-75c3-8628-0815f256dd98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019e22b5-bcf3-7087-969b-d16d1f6f7660" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019e22b5-bcf3-7087-969b-d16d1f6f7660" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019e22b5-bcf3-73e1-960d-5a961b300381" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019e22b5-bcf3-73e1-960d-5a961b300381" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019e22b5-bcf3-78fd-9c3e-52b788bfba0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019e22b5-bcf3-78fd-9c3e-52b788bfba0f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019e22b5-bcf3-7d7e-8160-d1746df55d22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetLiabilityGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-7726-b4fc-cb7ac7d731bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetLiabilityGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-7726-b4fc-cb7ac7d731bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings_019e22b5-bcf3-74d8-b04e-4871510703ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings_019e22b5-bcf3-74d8-b04e-4871510703ec" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofRollforwardofLevel3AssetsandLiabilitiesHeldatFairValueDetails_1" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesScheduleofRollforwardofLevel3AssetsandLiabilitiesHeldatFairValueDetails_1"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofRollforwardofLevel3AssetsandLiabilitiesHeldatFairValueDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e22b5-bcf3-72ca-b723-0f1fd55ea066" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e22b5-bcf3-72ca-b723-0f1fd55ea066" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-76ce-84d8-d1bc5c3d1266" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-7816-91d5-9076534951f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019e22b5-bcf3-7816-91d5-9076534951f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-71f3-97d5-50669b86f408" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPublicMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-71f3-97d5-50669b86f408" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-7c63-8bd5-a91768dcc224" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-7c63-8bd5-a91768dcc224" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7216-beb6-1bf7c48cc02b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019e22b5-bcf3-7216-beb6-1bf7c48cc02b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-758d-99bd-7a990e568e63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-71ae-851e-abfa9dba71b3" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_019e22b5-bcf3-758d-99bd-7a990e568e63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-74d6-a00c-12c4da99b34a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-74d6-a00c-12c4da99b34a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7120-b061-4b77bf5c7b63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019e22b5-bcf3-7120-b061-4b77bf5c7b63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherInvestmentAssetsMember_019e22c2-b2a4-7c3b-b355-c2c44d1e5be1" xlink:href="all-20260630.xsd#all_OtherInvestmentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_all_OtherInvestmentAssetsMember_019e22c2-b2a4-7c3b-b355-c2c44d1e5be1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherAssetClassMember_019e22c2-6feb-798a-bff5-77a764343515" xlink:href="all-20260630.xsd#all_OtherAssetClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_all_OtherAssetClassMember_019e22c2-6feb-798a-bff5-77a764343515" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AssetsHeldForSaleMember_019e22b5-bcf3-7b8e-b18c-01798adbf2bd" xlink:href="all-20260630.xsd#all_AssetsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7284-8fea-bcfc79db8dc8" xlink:to="loc_all_AssetsHeldForSaleMember_019e22b5-bcf3-7b8e-b18c-01798adbf2bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019e22b5-bcf3-7d13-b8be-e51910e8aa3c" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-731e-8ff5-2a3149977b59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-731e-8ff5-2a3149977b59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-7911-bfe4-51f73caeb9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22b5-bcf3-731e-8ff5-2a3149977b59" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-7911-bfe4-51f73caeb9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherLiabilityClassMember_019e22c4-3c62-76e7-b32f-ee1d01dc7283" xlink:href="all-20260630.xsd#all_OtherLiabilityClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22b5-bcf3-7911-bfe4-51f73caeb9f3" xlink:to="loc_all_OtherLiabilityClassMember_019e22c4-3c62-76e7-b32f-ee1d01dc7283" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019e22b5-bcf3-72ca-b723-0f1fd55ea066" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e22b5-bcf3-7203-a113-d2368a99d1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e22b5-bcf3-7203-a113-d2368a99d1cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019e22b5-bcf3-7c8d-9c11-bced85e10f88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019e22b5-bcf3-7c8d-9c11-bced85e10f88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019e22b5-bcf3-78f1-b1ce-c7f17643fff5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019e22b5-bcf3-78f1-b1ce-c7f17643fff5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019e22b5-bcf3-7938-8f6f-c75215f2a1fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019e22b5-bcf3-7938-8f6f-c75215f2a1fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019e22b5-bcf3-77c7-bb6d-0baba97f1a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019e22b5-bcf3-77c7-bb6d-0baba97f1a4e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019e22b5-bcf3-7fb1-aaab-d464529b810a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019e22b5-bcf3-7fb1-aaab-d464529b810a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019e22b5-bcf3-71cd-914c-a025bc7cf35b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019e22b5-bcf3-71cd-914c-a025bc7cf35b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019e22b5-bcf3-7044-81f0-dd159b149810" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019e22b5-bcf3-753d-a8d0-bc587863845b" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019e22b5-bcf3-7044-81f0-dd159b149810" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019e22b5-bcf3-7782-8317-403cec82b669" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019e22b5-bcf3-72ec-a02d-3cc53beb7cea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019e22b5-bcf3-72ec-a02d-3cc53beb7cea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019e22b5-bcf3-7597-bbf0-a50b2cc5e209" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019e22b5-bcf3-7597-bbf0-a50b2cc5e209" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019e22b5-bcf3-7f27-b2c9-9b92f4f9ebad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019e22b5-bcf3-7f27-b2c9-9b92f4f9ebad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019e22b5-bcf3-7007-a291-2846ce23f59a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019e22b5-bcf3-7007-a291-2846ce23f59a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019e22b5-bcf3-75c3-8628-0815f256dd98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019e22b5-bcf3-75c3-8628-0815f256dd98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019e22b5-bcf3-7087-969b-d16d1f6f7660" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019e22b5-bcf3-7087-969b-d16d1f6f7660" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019e22b5-bcf3-73e1-960d-5a961b300381" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019e22b5-bcf3-73e1-960d-5a961b300381" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019e22b5-bcf3-78fd-9c3e-52b788bfba0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7f06-a617-b812d494f310" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019e22b5-bcf3-78fd-9c3e-52b788bfba0f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019e22b5-bcf3-7d7e-8160-d1746df55d22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019e22b5-bcf3-7840-87b1-7a5ee8acb591" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetLiabilityGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-7726-b4fc-cb7ac7d731bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetLiabilityGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-7726-b4fc-cb7ac7d731bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings_019e22b5-bcf3-74d8-b04e-4871510703ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract_019e22b5-bcf3-7ced-b7c6-6412970dd58b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings_019e22b5-bcf3-74d8-b04e-4871510703ec" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofValuationChangesIncludedinNetIncomeandOCIforLevel3AssetsandLiabilitiesHeldDetails" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesScheduleofValuationChangesIncludedinNetIncomeandOCIforLevel3AssetsandLiabilitiesHeldDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofValuationChangesIncludedinNetIncomeandOCIforLevel3AssetsandLiabilitiesHeldDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:href="all-20260630.xsd#all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:href="all-20260630.xsd#all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-73f0-be40-e6f823628e9b" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPublicMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:to="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-73f0-be40-e6f823628e9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-71c2-8a1b-c7ea7b6f9954" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:to="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-71c2-8a1b-c7ea7b6f9954" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7dcf-84d2-bfb47e3c2f19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7dcf-84d2-bfb47e3c2f19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherAssetClassMember_019e22c0-9715-7219-953b-ffbc6ed49b8a" xlink:href="all-20260630.xsd#all_OtherAssetClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_all_OtherAssetClassMember_019e22c0-9715-7219-953b-ffbc6ed49b8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019f636b-be2a-723e-a366-3ec9f54e95aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019f636b-be2a-723e-a366-3ec9f54e95aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bcf3-7c9b-86db-5bb97c3240e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bcf3-7c9b-86db-5bb97c3240e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7526-869d-44237ed1bb3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7526-869d-44237ed1bb3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7f84-b5b6-a2a2cc37a974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7f84-b5b6-a2a2cc37a974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherLiabilityClassMember_019e22c0-fdb9-7751-ac97-30921207dacc" xlink:href="all-20260630.xsd#all_OtherLiabilityClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7f84-b5b6-a2a2cc37a974" xlink:to="loc_all_OtherLiabilityClassMember_019e22c0-fdb9-7751-ac97-30921207dacc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7676-9178-8eb07ac5abe4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7676-9178-8eb07ac5abe4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7fde-a5cb-a66150d717bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7fde-a5cb-a66150d717bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019f7148-6400-7837-be04-7ad9c18f2a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7fde-a5cb-a66150d717bd" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019f7148-6400-7837-be04-7ad9c18f2a9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-70f7-a264-b53efaf496c4" xlink:href="all-20260630.xsd#all_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-70f7-a264-b53efaf496c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e3b1f-ae80-7f90-a03e-1b60672cf04f" xlink:href="all-20260630.xsd#all_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e3b1f-ae80-7f90-a03e-1b60672cf04f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019e22b5-bcf3-755e-811a-91669c1d8153" xlink:href="all-20260630.xsd#all_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019e22b5-bcf3-755e-811a-91669c1d8153" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-72bd-be79-4c5d5387f1df" xlink:href="all-20260630.xsd#all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-72bd-be79-4c5d5387f1df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-739b-978e-0128cd7448b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-739b-978e-0128cd7448b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019e22b5-bcf3-7908-b916-0e4b8c3b3f17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019e22b5-bcf3-7908-b916-0e4b8c3b3f17" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_019e22b5-bcf3-75ae-b15c-f980b8fb59cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_019e22b5-bcf3-75ae-b15c-f980b8fb59cc" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofValuationChangesIncludedinNetIncomeandOCIforLevel3AssetsandLiabilitiesHeldDetails_1" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesScheduleofValuationChangesIncludedinNetIncomeandOCIforLevel3AssetsandLiabilitiesHeldDetails_1"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofValuationChangesIncludedinNetIncomeandOCIforLevel3AssetsandLiabilitiesHeldDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:href="all-20260630.xsd#all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:href="all-20260630.xsd#all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019e22b5-bcf3-7e5b-bfbd-69903d57bfd3" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-73f0-be40-e6f823628e9b" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPublicMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:to="loc_all_CorporateDebtSecuritiesPublicMember_019e22b5-bcf3-73f0-be40-e6f823628e9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-71c2-8a1b-c7ea7b6f9954" xlink:href="all-20260630.xsd#all_CorporateDebtSecuritiesPrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FixedIncomeSecuritiesMember_019e22b5-bcf3-7c19-8cae-5ed17027c9f3" xlink:to="loc_all_CorporateDebtSecuritiesPrivatePlacementMember_019e22b5-bcf3-71c2-8a1b-c7ea7b6f9954" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7dcf-84d2-bfb47e3c2f19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_us-gaap_EquitySecuritiesMember_019e22b5-bcf3-7dcf-84d2-bfb47e3c2f19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherAssetClassMember_019e22c0-9715-7219-953b-ffbc6ed49b8a" xlink:href="all-20260630.xsd#all_OtherAssetClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_all_OtherAssetClassMember_019e22c0-9715-7219-953b-ffbc6ed49b8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019f636b-be2a-723e-a366-3ec9f54e95aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019e22b5-bcf3-76a5-bee3-afba81b30b0d" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019f636b-be2a-723e-a366-3ec9f54e95aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7526-869d-44237ed1bb3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7526-869d-44237ed1bb3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7f84-b5b6-a2a2cc37a974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019e22c0-fdb9-7526-869d-44237ed1bb3c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7f84-b5b6-a2a2cc37a974" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OtherLiabilityClassMember_019e22c0-fdb9-7751-ac97-30921207dacc" xlink:href="all-20260630.xsd#all_OtherLiabilityClassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019e22c0-fdb9-7f84-b5b6-a2a2cc37a974" xlink:to="loc_all_OtherLiabilityClassMember_019e22c0-fdb9-7751-ac97-30921207dacc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossTable_019e22b5-bcf3-706c-af4a-fd852642a0df" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7676-9178-8eb07ac5abe4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7676-9178-8eb07ac5abe4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7fde-a5cb-a66150d717bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019f7148-49ac-7676-9178-8eb07ac5abe4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7fde-a5cb-a66150d717bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019f7148-6400-7837-be04-7ad9c18f2a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019f7148-49ac-7fde-a5cb-a66150d717bd" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019f7148-6400-7837-be04-7ad9c18f2a9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-70f7-a264-b53efaf496c4" xlink:href="all-20260630.xsd#all_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-70f7-a264-b53efaf496c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e3b1f-ae80-7f90-a03e-1b60672cf04f" xlink:href="all-20260630.xsd#all_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e3b1f-ae80-7f90-a03e-1b60672cf04f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019e22b5-bcf3-755e-811a-91669c1d8153" xlink:href="all-20260630.xsd#all_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag_019e22b5-bcf3-755e-811a-91669c1d8153" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-72bd-be79-4c5d5387f1df" xlink:href="all-20260630.xsd#all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings_019e22b5-bcf3-72bd-be79-4c5d5387f1df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-739b-978e-0128cd7448b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList_019e22b5-bcf3-739b-978e-0128cd7448b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019e22b5-bcf3-7908-b916-0e4b8c3b3f17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019e22b5-bcf3-7908-b916-0e4b8c3b3f17" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_019e22b5-bcf3-75ae-b15c-f980b8fb59cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputsGainLossLineItems_019e22b5-bcf3-790d-adbe-be47e1788f0e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_019e22b5-bcf3-75ae-b15c-f980b8fb59cc" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofFinancialInstrumentsNotCarriedatFairValueDetails" xlink:type="simple" xlink:href="all-20260630.xsd#FairValueofAssetsandLiabilitiesScheduleofFinancialInstrumentsNotCarriedatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/FairValueofAssetsandLiabilitiesScheduleofFinancialInstrumentsNotCarriedatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e22b5-bcf3-7357-af7d-48f81d56f1de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e22b5-bcf3-7e0a-9d08-84fff4c19640" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e22b5-bcf3-7357-af7d-48f81d56f1de" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e22b5-bcf3-7e0a-9d08-84fff4c19640" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7862-b47c-8226366f4f65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e22b5-bcf3-7e0a-9d08-84fff4c19640" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7862-b47c-8226366f4f65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7862-b47c-8226366f4f65_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7862-b47c-8226366f4f65" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7862-b47c-8226366f4f65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7e2e-9128-f95cc035d430" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e22b5-bcf3-7862-b47c-8226366f4f65" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7e2e-9128-f95cc035d430" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e22b5-bcf3-7ba2-b89e-f5b3f1992b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7e2e-9128-f95cc035d430" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e22b5-bcf3-7ba2-b89e-f5b3f1992b8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e22b5-bcf3-7e48-a674-1aa58dc6ee98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e22b5-bcf3-7e2e-9128-f95cc035d430" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e22b5-bcf3-7e48-a674-1aa58dc6ee98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019e22b5-bcf3-777b-8be3-a3d986550ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e22b5-bcf3-7e0a-9d08-84fff4c19640" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019e22b5-bcf3-777b-8be3-a3d986550ccd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e22b5-bcf3-777b-8be3-a3d986550ccd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e22b5-bcf3-777b-8be3-a3d986550ccd" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e22b5-bcf3-777b-8be3-a3d986550ccd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e22b5-bcf3-76be-b7b8-76a50db7f3a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e22b5-bcf3-777b-8be3-a3d986550ccd" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e22b5-bcf3-76be-b7b8-76a50db7f3a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e22b5-bcf3-7906-bfbc-91d8aa4f40c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e22b5-bcf3-76be-b7b8-76a50db7f3a8" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e22b5-bcf3-7906-bfbc-91d8aa4f40c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e22b5-bcf3-76f3-873a-e921485967d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e22b5-bcf3-7906-bfbc-91d8aa4f40c3" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e22b5-bcf3-76f3-873a-e921485967d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e22b5-bcf3-7a5d-952b-9bb2e5c0ccdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e22b5-bcf3-7906-bfbc-91d8aa4f40c3" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e22b5-bcf3-7a5d-952b-9bb2e5c0ccdf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e22b5-bcf3-7a17-9cee-f316022fc2be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e22b5-bcf3-7357-af7d-48f81d56f1de" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e22b5-bcf3-7a17-9cee-f316022fc2be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-7c01-845e-da153aa42fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e22b5-bcf3-7a17-9cee-f316022fc2be" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019e22b5-bcf3-7c01-845e-da153aa42fbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BankLoansCategorizedUnderOtherInvestments_019e22b5-bcf3-7aca-a713-b157637a9708" xlink:href="all-20260630.xsd#all_BankLoansCategorizedUnderOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019e22b5-bcf3-7a17-9cee-f316022fc2be" xlink:to="loc_all_BankLoansCategorizedUnderOtherInvestments_019e22b5-bcf3-7aca-a713-b157637a9708" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e22b5-bcf3-75a3-b573-3d10c45f0607" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e22b5-bcf3-7357-af7d-48f81d56f1de" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e22b5-bcf3-75a3-b573-3d10c45f0607" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e22b5-bcf3-701e-90b2-5eaa704921c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e22b5-bcf3-75a3-b573-3d10c45f0607" xlink:to="loc_us-gaap_LongTermDebt_019e22b5-bcf3-701e-90b2-5eaa704921c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives_019e22b5-bcf3-7d64-b033-993163fb8a9b" xlink:href="all-20260630.xsd#all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019e22b5-bcf3-75a3-b573-3d10c45f0607" xlink:to="loc_all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives_019e22b5-bcf3-7d64-b033-993163fb8a9b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofVolumeandFairValuePositionsofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="all-20260630.xsd#DerivativeFinancialInstrumentsScheduleofVolumeandFairValuePositionsofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofVolumeandFairValuePositionsofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e22b5-bcf3-73b9-befe-560b675ba1ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e22b5-bcf3-73b9-befe-560b675ba1ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-7b6d-9a0a-efa3d590de64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e22b5-bcf3-73b9-befe-560b675ba1ac" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-7b6d-9a0a-efa3d590de64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b6d-9a0a-efa3d590de64_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-7b6d-9a0a-efa3d590de64" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b6d-9a0a-efa3d590de64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-7b6d-9a0a-efa3d590de64" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_019e22b5-bcf3-7341-861a-7cc7b1eb5382" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_us-gaap_InterestRateCapMember_019e22b5-bcf3-7341-861a-7cc7b1eb5382" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019e22b5-bcf3-7ddb-a77a-5bbc27845628" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_us-gaap_InterestRateSwapMember_019e22b5-bcf3-7ddb-a77a-5bbc27845628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_InterestRateFinancialFuturesContractsMember_019e22b5-bcf3-772d-a5c7-48a48698d79d" xlink:href="all-20260630.xsd#all_InterestRateFinancialFuturesContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_all_InterestRateFinancialFuturesContractsMember_019e22b5-bcf3-772d-a5c7-48a48698d79d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_EquityAndIndexContractsOptionsAndWarrantsMember_019e22b5-bcf3-7a87-9b08-73ae326d2a2b" xlink:href="all-20260630.xsd#all_EquityAndIndexContractsOptionsAndWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_all_EquityAndIndexContractsOptionsAndWarrantsMember_019e22b5-bcf3-7a87-9b08-73ae326d2a2b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_EquityAndIndexContractsOptionsMember_019e22b5-bcf3-7efc-a097-5e0fcc6c592f" xlink:href="all-20260630.xsd#all_EquityAndIndexContractsOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_all_EquityAndIndexContractsOptionsMember_019e22b5-bcf3-7efc-a097-5e0fcc6c592f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_EquityAndIndexContractsFinancialFuturesContractsMember_019e22b5-bcf3-734d-a983-d58165c0adf3" xlink:href="all-20260630.xsd#all_EquityAndIndexContractsFinancialFuturesContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_all_EquityAndIndexContractsFinancialFuturesContractsMember_019e22b5-bcf3-734d-a983-d58165c0adf3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ForeignCurrencyForwardsMember_019e22b5-bcf3-7532-97f2-fcf7b0ba59a5" xlink:href="all-20260630.xsd#all_ForeignCurrencyForwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_all_ForeignCurrencyForwardsMember_019e22b5-bcf3-7532-97f2-fcf7b0ba59a5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ContingentConsiderationDerivativeMember_019e22b5-bcf3-76db-80b3-691aa32469c3" xlink:href="all-20260630.xsd#all_ContingentConsiderationDerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_all_ContingentConsiderationDerivativeMember_019e22b5-bcf3-76db-80b3-691aa32469c3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapSellingProtectionMember_019e22b5-bcf3-769f-9543-2f1052cc383e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDefaultSwapSellingProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7b19-8bd9-249f34342060" xlink:to="loc_us-gaap_CreditDefaultSwapSellingProtectionMember_019e22b5-bcf3-769f-9543-2f1052cc383e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e22b5-bcf3-7f79-8b27-367a7adff79e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e22b5-bcf3-73b9-befe-560b675ba1ac" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e22b5-bcf3-7f79-8b27-367a7adff79e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e22b5-bcf3-7f79-8b27-367a7adff79e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e22b5-bcf3-7f79-8b27-367a7adff79e" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e22b5-bcf3-7f79-8b27-367a7adff79e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e22b5-bcf3-75e0-a826-27341b0e8946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e22b5-bcf3-7f79-8b27-367a7adff79e" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e22b5-bcf3-75e0-a826-27341b0e8946" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019e22b5-bcf3-7e2f-ad28-ff6b0f4e0899" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e22b5-bcf3-75e0-a826-27341b0e8946" xlink:to="loc_us-gaap_NondesignatedMember_019e22b5-bcf3-7e2f-ad28-ff6b0f4e0899" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_019e22b5-bcf3-7762-9b65-03203d5872fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_019e22b5-bcf3-7762-9b65-03203d5872fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotionalAmount_019e22b5-bcf3-79bc-97e2-3e86ea8796c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeLiabilityNotionalAmount_019e22b5-bcf3-79bc-97e2-3e86ea8796c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e22b5-bcf3-7501-bf1a-593d0d244e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e22b5-bcf3-7501-bf1a-593d0d244e1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNumberOfInstrumentsHeld_019e22b5-bcf3-7175-9a3f-977b1a26b8cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeAssetNumberOfInstrumentsHeld_019e22b5-bcf3-7175-9a3f-977b1a26b8cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld_019e22b5-bcf3-73cb-8f84-3dd3923b90ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld_019e22b5-bcf3-73cb-8f84-3dd3923b90ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019e22b5-bcf3-7f5e-a22d-2aa0a9f3b10d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019e22b5-bcf3-7f5e-a22d-2aa0a9f3b10d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e22b5-bcf3-7798-9166-dba4e1417e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeAssets_019e22b5-bcf3-7798-9166-dba4e1417e36" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019e22b5-bcf3-727f-b89f-ae7c2fbba26a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeLiabilities_019e22b5-bcf3-727f-b89f-ae7c2fbba26a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019e22b5-bcf3-7284-afc5-22f601e5ec7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_019e22b5-bcf3-7284-afc5-22f601e5ec7f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e22b5-bcf3-724d-994e-0f9bf0a6d5aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e22b5-bcf3-724d-994e-0f9bf0a6d5aa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019e22b5-bcf3-7497-b658-9ae0173bb054" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019e22b5-bcf3-7497-b658-9ae0173bb054" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019e22b5-bcf3-7f77-bb21-160a24950820" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019e22b5-bcf3-7f77-bb21-160a24950820" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e22b5-bcf3-7f76-9606-0ef0c8213293" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e22b5-bcf3-7212-a3fc-5053f3a432ef" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e22b5-bcf3-7f76-9606-0ef0c8213293" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofGrossandNetAmountsforOTCDerivativesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#DerivativeFinancialInstrumentsScheduleofGrossandNetAmountsforOTCDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofGrossandNetAmountsforOTCDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_all_OffsettingAssetsAndLiabilitiesLineItems_019e22b5-bcf3-7d87-9fe7-7018ab418081" xlink:href="all-20260630.xsd#all_OffsettingAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_OffsettingAssetsAndLiabilitiesTable_019e22b5-bcf3-7253-8833-e77a7b1eda6a" xlink:href="all-20260630.xsd#all_OffsettingAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_all_OffsettingAssetsAndLiabilitiesLineItems_019e22b5-bcf3-7d87-9fe7-7018ab418081" xlink:to="loc_all_OffsettingAssetsAndLiabilitiesTable_019e22b5-bcf3-7253-8833-e77a7b1eda6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionMarketMethodAxis_019f70dc-6dd4-7eae-99f2-f7842bce5750" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransactionMarketMethodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_OffsettingAssetsAndLiabilitiesTable_019e22b5-bcf3-7253-8833-e77a7b1eda6a" xlink:to="loc_us-gaap_TransactionMarketMethodAxis_019f70dc-6dd4-7eae-99f2-f7842bce5750" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionMarketMethodDomain_019f70dc-6dd4-7eae-99f2-f7842bce5750_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransactionMarketMethodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionMarketMethodAxis_019f70dc-6dd4-7eae-99f2-f7842bce5750" xlink:to="loc_us-gaap_TransactionMarketMethodDomain_019f70dc-6dd4-7eae-99f2-f7842bce5750_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionMarketMethodDomain_019f70dc-6dd4-7f0d-830e-65bfb9be4e04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransactionMarketMethodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionMarketMethodAxis_019f70dc-6dd4-7eae-99f2-f7842bce5750" xlink:to="loc_us-gaap_TransactionMarketMethodDomain_019f70dc-6dd4-7f0d-830e-65bfb9be4e04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OverTheCounterMember_019e22b5-bcf3-70cd-81b4-dcb5824abb31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OverTheCounterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionMarketMethodDomain_019f70dc-6dd4-7f0d-830e-65bfb9be4e04" xlink:to="loc_us-gaap_OverTheCounterMember_019e22b5-bcf3-70cd-81b4-dcb5824abb31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_OffsettingAssetsAndLiabilitiesLineItems_019e22b5-bcf3-7d87-9fe7-7018ab418081" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e22b5-bcf3-768c-8086-8b28f27aa78f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e22b5-bcf3-768c-8086-8b28f27aa78f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019e22b5-bcf3-769c-b586-4070be3f645f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019e22b5-bcf3-769c-b586-4070be3f645f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DerivativeAssetSubjectToMasterNettingArrangementCollateralObligationToReturnCashOffsetAgainstDerivativeAssetNet_019e22b5-bcf3-728b-9d27-2e76ca85ad0d" xlink:href="all-20260630.xsd#all_DerivativeAssetSubjectToMasterNettingArrangementCollateralObligationToReturnCashOffsetAgainstDerivativeAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:to="loc_all_DerivativeAssetSubjectToMasterNettingArrangementCollateralObligationToReturnCashOffsetAgainstDerivativeAssetNet_019e22b5-bcf3-728b-9d27-2e76ca85ad0d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e22b5-bcf3-7a56-9f39-5b8d7b92acb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:to="loc_us-gaap_DerivativeAssets_019e22b5-bcf3-7a56-9f39-5b8d7b92acb2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_019e22b5-bcf3-709f-b971-e497aec6a5f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralObligationToReturnSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_019e22b5-bcf3-709f-b971-e497aec6a5f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019e22b5-bcf3-72ca-a5e5-40203aa2f6f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e22b5-bcf3-7890-a506-a4a3ecd1b4b5" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019e22b5-bcf3-72ca-a5e5-40203aa2f6f9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_OffsettingAssetsAndLiabilitiesLineItems_019e22b5-bcf3-7d87-9fe7-7018ab418081" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e22b5-bcf3-793a-8c88-a53021c400e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e22b5-bcf3-793a-8c88-a53021c400e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019e22b5-bcf3-71c6-859b-f8969813672c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019e22b5-bcf3-71c6-859b-f8969813672c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_019e22b5-bcf3-7765-8311-0317a6d428e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_019e22b5-bcf3-7765-8311-0317a6d428e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019e22b5-bcf3-7cf3-9d7a-d0cce7392308" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:to="loc_us-gaap_DerivativeLiabilities_019e22b5-bcf3-7cf3-9d7a-d0cce7392308" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_019e22b5-bcf3-7d55-9aa4-21e2f8bcf53b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralRightToReclaimSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_019e22b5-bcf3-7d55-9aa4-21e2f8bcf53b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_019e22b5-bcf3-7af2-be7a-1ab5cd260a01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e22b5-bcf3-7fe5-886b-9aeee5304e74" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_019e22b5-bcf3-7af2-be7a-1ab5cd260a01" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofGainsLossesfromValuationandSettlementsReportedonDerivativesNotDesignatedasAccountingHedgesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#DerivativeFinancialInstrumentsScheduleofGainsLossesfromValuationandSettlementsReportedonDerivativesNotDesignatedasAccountingHedgesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofGainsLossesfromValuationandSettlementsReportedonDerivativesNotDesignatedasAccountingHedgesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e22b5-bcf3-7c3d-be6b-51472e32a6cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e22b5-bcf3-7c3d-be6b-51472e32a6cf" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-75d0-a5ab-ae6fea63feec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-75d0-a5ab-ae6fea63feec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e22b5-bcf3-76cb-8a64-8119c2b24327" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_us-gaap_InterestRateContractMember_019e22b5-bcf3-76cb-8a64-8119c2b24327" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_EquityAndIndexContractMember_019e22b5-bcf3-7c47-a273-b90aef8d6e72" xlink:href="all-20260630.xsd#all_EquityAndIndexContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_all_EquityAndIndexContractMember_019e22b5-bcf3-7c47-a273-b90aef8d6e72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ContingentConsiderationDerivativeMember_019e22b5-bcf3-7d71-b90e-b0d750a8df14" xlink:href="all-20260630.xsd#all_ContingentConsiderationDerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_all_ContingentConsiderationDerivativeMember_019e22b5-bcf3-7d71-b90e-b0d750a8df14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e22b5-bcf3-7bd7-bd9f-a1b34b4242eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e22b5-bcf3-7bd7-bd9f-a1b34b4242eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_019e22b5-bcf3-7962-9cc7-f8d9513bee75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_us-gaap_CreditDefaultSwapMember_019e22b5-bcf3-7962-9cc7-f8d9513bee75" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bcf3-70b1-93ca-1dc1d708b311" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bcf3-70b1-93ca-1dc1d708b311" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e22b5-bcf3-7b57-b411-43100848e123" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e22b5-bcf3-7c3d-be6b-51472e32a6cf" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e22b5-bcf3-7b57-b411-43100848e123" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofGainsLossesfromValuationandSettlementsReportedonDerivativesNotDesignatedasAccountingHedgesDetails_1" xlink:type="simple" xlink:href="all-20260630.xsd#DerivativeFinancialInstrumentsScheduleofGainsLossesfromValuationandSettlementsReportedonDerivativesNotDesignatedasAccountingHedgesDetails_1"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofGainsLossesfromValuationandSettlementsReportedonDerivativesNotDesignatedasAccountingHedgesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e22b5-bcf3-7c3d-be6b-51472e32a6cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e22b5-bcf3-7c3d-be6b-51472e32a6cf" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e22b5-bcf3-7f20-8fa6-14efc62aeb61" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-75d0-a5ab-ae6fea63feec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-75d0-a5ab-ae6fea63feec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e22b5-bcf3-75d0-a5ab-ae6fea63feec" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e22b5-bcf3-76cb-8a64-8119c2b24327" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_us-gaap_InterestRateContractMember_019e22b5-bcf3-76cb-8a64-8119c2b24327" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_EquityAndIndexContractMember_019e22b5-bcf3-7c47-a273-b90aef8d6e72" xlink:href="all-20260630.xsd#all_EquityAndIndexContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_all_EquityAndIndexContractMember_019e22b5-bcf3-7c47-a273-b90aef8d6e72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ContingentConsiderationDerivativeMember_019e22b5-bcf3-7d71-b90e-b0d750a8df14" xlink:href="all-20260630.xsd#all_ContingentConsiderationDerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_all_ContingentConsiderationDerivativeMember_019e22b5-bcf3-7d71-b90e-b0d750a8df14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e22b5-bcf3-7bd7-bd9f-a1b34b4242eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e22b5-bcf3-7bd7-bd9f-a1b34b4242eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_019e22b5-bcf3-7962-9cc7-f8d9513bee75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e22b5-bcf3-7085-b184-64e5f8dbf743" xlink:to="loc_us-gaap_CreditDefaultSwapMember_019e22b5-bcf3-7962-9cc7-f8d9513bee75" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e22b5-bcf3-7b57-b411-43100848e123" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e22b5-bcf3-7c3d-be6b-51472e32a6cf" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e22b5-bcf3-7b57-b411-43100848e123" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/DerivativeFinancialInstrumentsandOffbalanceSheetFinancialInstrumentsScheduleofOTCDerivativesCounterpartyCreditExposurebyCounterpartyCreditRatingDetails" xlink:type="simple" xlink:href="all-20260630.xsd#DerivativeFinancialInstrumentsandOffbalanceSheetFinancialInstrumentsScheduleofOTCDerivativesCounterpartyCreditExposurebyCounterpartyCreditRatingDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/DerivativeFinancialInstrumentsandOffbalanceSheetFinancialInstrumentsScheduleofOTCDerivativesCounterpartyCreditExposurebyCounterpartyCreditRatingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesLineItems_019e22b5-bcf3-7818-a7ad-0e970e98542e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDerivativesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCreditDerivativesTable_019e22b5-bcf3-7f53-848d-63671f1440d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCreditDerivativesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CreditDerivativesLineItems_019e22b5-bcf3-7818-a7ad-0e970e98542e" xlink:to="loc_us-gaap_ScheduleOfCreditDerivativesTable_019e22b5-bcf3-7f53-848d-63671f1440d3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7048-b465-0b6a307fbf55" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CreditRatingStandardPoorsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCreditDerivativesTable_019e22b5-bcf3-7f53-848d-63671f1440d3" xlink:to="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7048-b465-0b6a307fbf55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7048-b465-0b6a307fbf55_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7048-b465-0b6a307fbf55" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7048-b465-0b6a307fbf55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7668-9abb-975734e7b482" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-7048-b465-0b6a307fbf55" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7668-9abb-975734e7b482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAAMinusRatingMember_019e22b5-bcf3-7c18-a168-89f9718fa29a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsAAMinusRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7668-9abb-975734e7b482" xlink:to="loc_srt_StandardPoorsAAMinusRatingMember_019e22b5-bcf3-7c18-a168-89f9718fa29a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAPlusRatingMember_019e22b5-bcf3-7292-8f7a-06165913e0c3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsAPlusRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7668-9abb-975734e7b482" xlink:to="loc_srt_StandardPoorsAPlusRatingMember_019e22b5-bcf3-7292-8f7a-06165913e0c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NumberOfCounterparties_019e22b5-bcf3-77ff-b91e-35aae049c478" xlink:href="all-20260630.xsd#all_NumberOfCounterparties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesLineItems_019e22b5-bcf3-7818-a7ad-0e970e98542e" xlink:to="loc_all_NumberOfCounterparties_019e22b5-bcf3-77ff-b91e-35aae049c478" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NotionalAmountOfCounterpartyCreditExposure_019e22b5-bcf3-715c-9dce-7dbee35c9957" xlink:href="all-20260630.xsd#all_NotionalAmountOfCounterpartyCreditExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesLineItems_019e22b5-bcf3-7818-a7ad-0e970e98542e" xlink:to="loc_all_NotionalAmountOfCounterpartyCreditExposure_019e22b5-bcf3-715c-9dce-7dbee35c9957" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CounterpartyCreditExposure_019e22b5-bcf3-7d87-880a-4f8db2ba258d" xlink:href="all-20260630.xsd#all_CounterpartyCreditExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesLineItems_019e22b5-bcf3-7818-a7ad-0e970e98542e" xlink:to="loc_all_CounterpartyCreditExposure_019e22b5-bcf3-7d87-880a-4f8db2ba258d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CreditDerivativeExposureNetOfCollateral_019e22b5-bcf3-71de-8e26-27eeaa42a9a0" xlink:href="all-20260630.xsd#all_CreditDerivativeExposureNetOfCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesLineItems_019e22b5-bcf3-7818-a7ad-0e970e98542e" xlink:to="loc_all_CreditDerivativeExposureNetOfCollateral_019e22b5-bcf3-71de-8e26-27eeaa42a9a0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofCDSNotionalAmountsbyCreditRatingAndFairValueofProtectionSoldDetails" xlink:type="simple" xlink:href="all-20260630.xsd#DerivativeFinancialInstrumentsScheduleofCDSNotionalAmountsbyCreditRatingAndFairValueofProtectionSoldDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/DerivativeFinancialInstrumentsScheduleofCDSNotionalAmountsbyCreditRatingAndFairValueofProtectionSoldDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e22b5-bcf3-7fb7-8f0e-f3a8fc8dfe0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e22b5-bcf3-777f-baac-d3b661047570" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e22b5-bcf3-7fb7-8f0e-f3a8fc8dfe0a" xlink:to="loc_us-gaap_DerivativeTable_019e22b5-bcf3-777f-baac-d3b661047570" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-76f9-8801-47f5bec760bb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CreditRatingStandardPoorsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e22b5-bcf3-777f-baac-d3b661047570" xlink:to="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-76f9-8801-47f5bec760bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-76f9-8801-47f5bec760bb_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-76f9-8801-47f5bec760bb" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-76f9-8801-47f5bec760bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExternalCreditRatingStandardPoorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CreditRatingStandardPoorsAxis_019e22b5-bcf3-76f9-8801-47f5bec760bb" xlink:to="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAAARatingMember_019e22b5-bcf3-7df4-8840-33851eb22a64" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsAAARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:to="loc_srt_StandardPoorsAAARatingMember_019e22b5-bcf3-7df4-8840-33851eb22a64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsAARatingMember_019e22b5-bcf3-7197-8ef3-c541bda7ac9f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsAARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:to="loc_srt_StandardPoorsAARatingMember_019e22b5-bcf3-7197-8ef3-c541bda7ac9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsARatingMember_019e22b5-bcf3-7ab9-b153-85e2e4f3cdd0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsARatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:to="loc_srt_StandardPoorsARatingMember_019e22b5-bcf3-7ab9-b153-85e2e4f3cdd0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StandardPoorsBBBRatingMember_019e22b5-bcf3-7ae0-82fb-349eb960ef43" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StandardPoorsBBBRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:to="loc_srt_StandardPoorsBBBRatingMember_019e22b5-bcf3-7ae0-82fb-349eb960ef43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_StandardPoorsBBAndLowerRatingMember_019e22b5-bcf3-7f08-ac27-4d7dce38715f" xlink:href="all-20260630.xsd#all_StandardPoorsBBAndLowerRatingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ExternalCreditRatingStandardPoorsMember_019e22b5-bcf3-7527-9090-0fda672b5d38" xlink:to="loc_all_StandardPoorsBBAndLowerRatingMember_019e22b5-bcf3-7f08-ac27-4d7dce38715f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesByContractTypeAxis_019e22b5-bcf3-75da-bffa-835abe88740c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDerivativesByContractTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e22b5-bcf3-777f-baac-d3b661047570" xlink:to="loc_us-gaap_CreditDerivativesByContractTypeAxis_019e22b5-bcf3-75da-bffa-835abe88740c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesContractTypeDomain_019e22b5-bcf3-75da-bffa-835abe88740c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDerivativesContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditDerivativesByContractTypeAxis_019e22b5-bcf3-75da-bffa-835abe88740c" xlink:to="loc_us-gaap_CreditDerivativesContractTypeDomain_019e22b5-bcf3-75da-bffa-835abe88740c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesContractTypeDomain_019e22b5-bcf3-7c1f-b8f1-44a33eb05268" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDerivativesContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditDerivativesByContractTypeAxis_019e22b5-bcf3-75da-bffa-835abe88740c" xlink:to="loc_us-gaap_CreditDerivativesContractTypeDomain_019e22b5-bcf3-7c1f-b8f1-44a33eb05268" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_019e22b5-bcf3-7700-ba05-143f213daa5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesContractTypeDomain_019e22b5-bcf3-7c1f-b8f1-44a33eb05268" xlink:to="loc_us-gaap_CreditDefaultSwapMember_019e22b5-bcf3-7700-ba05-143f213daa5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e22b5-bcf3-74a9-a5cf-884639b4ebdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e22b5-bcf3-7fb7-8f0e-f3a8fc8dfe0a" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e22b5-bcf3-74a9-a5cf-884639b4ebdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskDerivativesAtFairValueNet_019e22b5-bcf3-798a-aa06-77a21240cb31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditRiskDerivativesAtFairValueNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e22b5-bcf3-7fb7-8f0e-f3a8fc8dfe0a" xlink:to="loc_us-gaap_CreditRiskDerivativesAtFairValueNet_019e22b5-bcf3-798a-aa06-77a21240cb31" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/VariableInterestEntitiesNarrativeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#VariableInterestEntitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/VariableInterestEntitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-71fd-8b9e-7bf6aa4eb2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019e22b5-bdbd-799e-94e9-6ee529a9aba1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-71fd-8b9e-7bf6aa4eb2bc" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019e22b5-bdbd-799e-94e9-6ee529a9aba1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7264-bfdb-891738d66876" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019e22b5-bdbd-799e-94e9-6ee529a9aba1" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7264-bfdb-891738d66876" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7264-bfdb-891738d66876_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7264-bfdb-891738d66876" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7264-bfdb-891738d66876_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7f52-a6be-42bd3371b2a0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7264-bfdb-891738d66876" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7f52-a6be-42bd3371b2a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019e22b5-bdbd-7b51-8c78-a4b29db8703d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7f52-a6be-42bd3371b2a0" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019e22b5-bdbd-7b51-8c78-a4b29db8703d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_019e22b5-bdbd-7710-8bfb-359ab53ecd08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-71fd-8b9e-7bf6aa4eb2bc" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_019e22b5-bdbd-7710-8bfb-359ab53ecd08" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/VariableInterestEntitiesScheduleofAssetsandLiabilitiesofReciprocalExchangesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#VariableInterestEntitiesScheduleofAssetsandLiabilitiesofReciprocalExchangesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/VariableInterestEntitiesScheduleofAssetsandLiabilitiesofReciprocalExchangesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-7f14-b6b8-1960730f998a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019e22b5-bdbd-72fc-b73c-af5b75ebe639" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-7f14-b6b8-1960730f998a" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019e22b5-bdbd-72fc-b73c-af5b75ebe639" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7981-9084-552fc3bb42f8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019e22b5-bdbd-72fc-b73c-af5b75ebe639" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7981-9084-552fc3bb42f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7981-9084-552fc3bb42f8_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7981-9084-552fc3bb42f8" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-7981-9084-552fc3bb42f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-762c-8600-b262c809c24e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019e22b5-bdbd-7981-9084-552fc3bb42f8" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-762c-8600-b262c809c24e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019e22b5-bdbd-702b-936e-c006956b2102" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019e22b5-bdbd-762c-8600-b262c809c24e" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019e22b5-bdbd-702b-936e-c006956b2102" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-7f14-b6b8-1960730f998a" xlink:to="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bdbd-7248-9f73-b599bac05eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019e22b5-bdbd-7248-9f73-b599bac05eb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherShortTermInvestments_019e22b5-bdbd-76cf-baf2-3ed2301e0e80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:to="loc_us-gaap_OtherShortTermInvestments_019e22b5-bdbd-76cf-baf2-3ed2301e0e80" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ReinsuranceAndIndemnificationRecoverablesNet_019e22b5-bdbd-7a57-a489-1a7a3b259254" xlink:href="all-20260630.xsd#all_ReinsuranceAndIndemnificationRecoverablesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:to="loc_all_ReinsuranceAndIndemnificationRecoverablesNet_019e22b5-bdbd-7a57-a489-1a7a3b259254" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019f5c31-4534-7708-beb6-5aece992c09e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:to="loc_us-gaap_OtherAssets_019f5c31-4534-7708-beb6-5aece992c09e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e22b5-bdbd-7a00-8bae-9d087718e6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e22b5-bdbd-79b8-9cc5-d7fae7597dd1" xlink:to="loc_us-gaap_Assets_019e22b5-bdbd-7a00-8bae-9d087718e6d0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019e22b5-bdbd-78d3-af93-ea26e8f4425d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019e22b5-bdbd-7f14-b6b8-1960730f998a" xlink:to="loc_us-gaap_LiabilitiesAbstract_019e22b5-bdbd-78d3-af93-ea26e8f4425d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7c90-ac7d-995ec5abb618" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e22b5-bdbd-78d3-af93-ea26e8f4425d" xlink:to="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7c90-ac7d-995ec5abb618" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_019e22b5-bdbd-76a4-bb76-208935e5ed69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e22b5-bdbd-78d3-af93-ea26e8f4425d" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_019e22b5-bdbd-76a4-bb76-208935e5ed69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e22b5-bdbd-7b41-aa79-8ab8ffec7b7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019e22b5-bdbd-78d3-af93-ea26e8f4425d" xlink:to="loc_us-gaap_Liabilities_019e22b5-bdbd-7b41-aa79-8ab8ffec7b7d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseScheduleofRollforwardoftheReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseScheduleofRollforwardoftheReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseScheduleofRollforwardoftheReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-78cb-9c67-5755a0f7809c" xlink:href="all-20260630.xsd#all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-785f-8f74-d0b8fa559708" xlink:href="all-20260630.xsd#all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-78cb-9c67-5755a0f7809c" xlink:to="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-785f-8f74-d0b8fa559708" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7c1d-a589-753ef83e3f6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-785f-8f74-d0b8fa559708" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7c1d-a589-753ef83e3f6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7c1d-a589-753ef83e3f6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7c1d-a589-753ef83e3f6c" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7c1d-a589-753ef83e3f6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7768-8965-faa46b4591af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7c1d-a589-753ef83e3f6c" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7768-8965-faa46b4591af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyAndCasualtyMember_019e22b5-bdbd-74ef-a030-7c3300754927" xlink:href="all-20260630.xsd#all_PropertyAndCasualtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7768-8965-faa46b4591af" xlink:to="loc_all_PropertyAndCasualtyMember_019e22b5-bdbd-74ef-a030-7c3300754927" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7db8-9606-8f97147b877f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-78cb-9c67-5755a0f7809c" xlink:to="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7db8-9606-8f97147b877f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019e22b5-bdbd-7da3-8f8b-0023282afbd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-78cb-9c67-5755a0f7809c" xlink:to="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019e22b5-bdbd-7da3-8f8b-0023282afbd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetRollForward_019e22b5-bdbd-7298-ac21-7e7d94ba31c4" xlink:href="all-20260630.xsd#all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-78cb-9c67-5755a0f7809c" xlink:to="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetRollForward_019e22b5-bdbd-7298-ac21-7e7d94ba31c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet_019e22b5-bdbd-7742-8b56-eeabf13244e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetRollForward_019e22b5-bdbd-7298-ac21-7e7d94ba31c4" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet_019e22b5-bdbd-7742-8b56-eeabf13244e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_019e22b5-bdbd-733e-a014-621b66fc446b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetRollForward_019e22b5-bdbd-7298-ac21-7e7d94ba31c4" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_019e22b5-bdbd-733e-a014-621b66fc446b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7e74-91f3-9916c9ded52f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_019e22b5-bdbd-733e-a014-621b66fc446b" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7e74-91f3-9916c9ded52f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7ab8-a6db-199327dbf3a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_019e22b5-bdbd-733e-a014-621b66fc446b" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7ab8-a6db-199327dbf3a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019e22b5-bdbd-76cc-be84-de0c48c830c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_019e22b5-bdbd-733e-a014-621b66fc446b" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019e22b5-bdbd-76cc-be84-de0c48c830c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_019e22b5-bdbd-78d6-81da-1306a2a4fab7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetRollForward_019e22b5-bdbd-7298-ac21-7e7d94ba31c4" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_019e22b5-bdbd-78d6-81da-1306a2a4fab7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_019e22b5-bdbd-7fc1-bb70-b402ac80dcd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_019e22b5-bdbd-78d6-81da-1306a2a4fab7" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_019e22b5-bdbd-7fc1-bb70-b402ac80dcd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_019e22b5-bdbd-7f0e-b390-95bc6a5edb40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_019e22b5-bdbd-78d6-81da-1306a2a4fab7" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_019e22b5-bdbd-7f0e-b390-95bc6a5edb40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_019e22b5-bdbd-7b72-aca4-9a051ffbd3c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForLossesAndLossAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_019e22b5-bdbd-78d6-81da-1306a2a4fab7" xlink:to="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_019e22b5-bdbd-7b72-aca4-9a051ffbd3c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet_019e22b5-bdbd-7c49-94c5-c783dac35b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019e22b5-bdbd-7e0c-8fc3-daa0b26471ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-736c-bf0b-a95846303262" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseNarrativeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7134-93d8-3715ee4f2e87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7a54-a939-44789c99bfa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7134-93d8-3715ee4f2e87" xlink:to="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7a54-a939-44789c99bfa8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-772f-9f24-d967b06e753d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7a54-a939-44789c99bfa8" xlink:to="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-772f-9f24-d967b06e753d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-772f-9f24-d967b06e753d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-772f-9f24-d967b06e753d" xlink:to="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-772f-9f24-d967b06e753d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-794f-a139-eded9aa56674" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-772f-9f24-d967b06e753d" xlink:to="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-794f-a139-eded9aa56674" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastropheMember_019e22b5-bdbd-75a1-a711-e7d35895d8f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastropheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-794f-a139-eded9aa56674" xlink:to="loc_us-gaap_CatastropheMember_019e22b5-bdbd-75a1-a711-e7d35895d8f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7a5f-bd5a-3dce62074327" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7a54-a939-44789c99bfa8" xlink:to="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7a5f-bd5a-3dce62074327" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7a5f-bd5a-3dce62074327_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7a5f-bd5a-3dce62074327" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7a5f-bd5a-3dce62074327_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7ec0-9d68-083c03271539" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7a5f-bd5a-3dce62074327" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7ec0-9d68-083c03271539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PersonalAutoInjuryCoverageMember_019e22b5-bdbd-7016-803b-4f048ec144f9" xlink:href="all-20260630.xsd#all_PersonalAutoInjuryCoverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7ec0-9d68-083c03271539" xlink:to="loc_all_PersonalAutoInjuryCoverageMember_019e22b5-bdbd-7016-803b-4f048ec144f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PersonalOtherAutoCoveragesMember_019e22b5-bdbd-73cd-869f-838e2a07b9b6" xlink:href="all-20260630.xsd#all_PersonalOtherAutoCoveragesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7ec0-9d68-083c03271539" xlink:to="loc_all_PersonalOtherAutoCoveragesMember_019e22b5-bdbd-73cd-869f-838e2a07b9b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-731b-b9c3-2f48753a42ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7a54-a939-44789c99bfa8" xlink:to="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-731b-b9c3-2f48753a42ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-731b-b9c3-2f48753a42ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-731b-b9c3-2f48753a42ff" xlink:to="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-731b-b9c3-2f48753a42ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-774d-b07a-9477454d7c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-731b-b9c3-2f48753a42ff" xlink:to="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-774d-b07a-9477454d7c1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_FavorableSeverityDevelopmentMember_019e22b5-bdbd-780d-b68a-bee8870df641" xlink:href="all-20260630.xsd#all_FavorableSeverityDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-774d-b07a-9477454d7c1d" xlink:to="loc_all_FavorableSeverityDevelopmentMember_019e22b5-bdbd-780d-b68a-bee8870df641" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearAxis_019e22b5-bdbd-7e0f-921d-170a371d82f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortdurationInsuranceContractsAccidentYearAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7a54-a939-44789c99bfa8" xlink:to="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearAxis_019e22b5-bdbd-7e0f-921d-170a371d82f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearDomain_019e22b5-bdbd-7e0f-921d-170a371d82f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortdurationInsuranceContractsAccidentYearDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearAxis_019e22b5-bdbd-7e0f-921d-170a371d82f4" xlink:to="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearDomain_019e22b5-bdbd-7e0f-921d-170a371d82f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearDomain_019e22b5-bdbd-7dd8-9a6d-141ff022f2be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortdurationInsuranceContractsAccidentYearDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearAxis_019e22b5-bdbd-7e0f-921d-170a371d82f4" xlink:to="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearDomain_019e22b5-bdbd-7dd8-9a6d-141ff022f2be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortDurationInsuranceContractAccidentYear2025Member_019f6e4d-a585-71b2-aad7-aca181587353" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortDurationInsuranceContractAccidentYear2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearDomain_019e22b5-bdbd-7dd8-9a6d-141ff022f2be" xlink:to="loc_us-gaap_ShortDurationInsuranceContractAccidentYear2025Member_019f6e4d-a585-71b2-aad7-aca181587353" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ShortDurationInsuranceContractAccidentYear2023And2024Member_019e22b5-bdbd-7ad7-9c82-9a80a0b98e98" xlink:href="all-20260630.xsd#all_ShortDurationInsuranceContractAccidentYear2023And2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortdurationInsuranceContractsAccidentYearDomain_019e22b5-bdbd-7dd8-9a6d-141ff022f2be" xlink:to="loc_all_ShortDurationInsuranceContractAccidentYear2023And2024Member_019e22b5-bdbd-7ad7-9c82-9a80a0b98e98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019e22b5-bdbd-73a6-b691-aca6fec5c726" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7134-93d8-3715ee4f2e87" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_019e22b5-bdbd-73a6-b691-aca6fec5c726" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7544-88fc-bac9ec36d325" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7134-93d8-3715ee4f2e87" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-7544-88fc-bac9ec36d325" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PriorYearClaimsAndClaimsAdjustmentExpensePercentage_019e22b5-bdbd-7e73-b33c-7bfca27c58cf" xlink:href="all-20260630.xsd#all_PriorYearClaimsAndClaimsAdjustmentExpensePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7134-93d8-3715ee4f2e87" xlink:to="loc_all_PriorYearClaimsAndClaimsAdjustmentExpensePercentage_019e22b5-bdbd-7e73-b33c-7bfca27c58cf" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseScheduleofPriorYearReserveReEstimatesIncludedinClaimsandClaimsExpenseDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseScheduleofPriorYearReserveReEstimatesIncludedinClaimsandClaimsExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReserveforPropertyandCasualtyInsuranceClaimsandClaimsExpenseScheduleofPriorYearReserveReEstimatesIncludedinClaimsandClaimsExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7e3f-95f0-cee420194a67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7042-b13e-894b234c6142" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7e3f-95f0-cee420194a67" xlink:to="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7042-b13e-894b234c6142" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7444-b670-8c224c530927" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7042-b13e-894b234c6142" xlink:to="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7444-b670-8c224c530927" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7444-b670-8c224c530927_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7444-b670-8c224c530927" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7444-b670-8c224c530927_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-7444-b670-8c224c530927" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AutoMember_019e22b5-bdbd-7b3d-9447-689cb2a4eac0" xlink:href="all-20260630.xsd#all_AutoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:to="loc_all_AutoMember_019e22b5-bdbd-7b3d-9447-689cb2a4eac0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_HomeOwnersMember_019e22b5-bdbd-74ea-82ab-96cff47b02d6" xlink:href="all-20260630.xsd#all_HomeOwnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:to="loc_all_HomeOwnersMember_019e22b5-bdbd-74ea-82ab-96cff47b02d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_SpecialtyLinesMember_019f88ca-08a2-7eef-af55-d8ce009c55cb" xlink:href="all-20260630.xsd#all_SpecialtyLinesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:to="loc_all_SpecialtyLinesMember_019f88ca-08a2-7eef-af55-d8ce009c55cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember_019e22b5-bdbd-7d9e-9fcc-e3b81eaf4bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:to="loc_us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember_019e22b5-bdbd-7d9e-9fcc-e3b81eaf4bc8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_BrokeredSolutionsAndCollateralProtectionMember_019f88ca-660f-7f27-aab1-98e58ff88ef8" xlink:href="all-20260630.xsd#all_BrokeredSolutionsAndCollateralProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:to="loc_all_BrokeredSolutionsAndCollateralProtectionMember_019f88ca-660f-7f27-aab1-98e58ff88ef8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_RunOffPropertyLiabilityMember_019e22b5-bdbd-7da7-b1e6-af999fad28ff" xlink:href="all-20260630.xsd#all_RunOffPropertyLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7d50-9090-9afe8b4b656d" xlink:to="loc_all_RunOffPropertyLiabilityMember_019e22b5-bdbd-7da7-b1e6-af999fad28ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-725d-8c39-1fb0ae3d78d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7042-b13e-894b234c6142" xlink:to="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-725d-8c39-1fb0ae3d78d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-725d-8c39-1fb0ae3d78d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-725d-8c39-1fb0ae3d78d1" xlink:to="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-725d-8c39-1fb0ae3d78d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-7fc7-88fd-8c0f3221f835" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NoncatastrophicEventAxis_019e22b5-bdbd-725d-8c39-1fb0ae3d78d1" xlink:to="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-7fc7-88fd-8c0f3221f835" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NonCatastropheReestimatesMember_019e22b5-bdbd-749f-a8c7-abbf0d2b3041" xlink:href="all-20260630.xsd#all_NonCatastropheReestimatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncatastrophicEventDomain_019e22b5-bdbd-7fc7-88fd-8c0f3221f835" xlink:to="loc_all_NonCatastropheReestimatesMember_019e22b5-bdbd-749f-a8c7-abbf0d2b3041" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-7aa5-96e0-9b1377dd097e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseTable_019e22b5-bdbd-7042-b13e-894b234c6142" xlink:to="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-7aa5-96e0-9b1377dd097e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-7aa5-96e0-9b1377dd097e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-7aa5-96e0-9b1377dd097e" xlink:to="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-7aa5-96e0-9b1377dd097e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-7208-9bef-e05a991cce0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastrophicEventDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis_019e22b5-bdbd-7aa5-96e0-9b1377dd097e" xlink:to="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-7208-9bef-e05a991cce0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CatastropheMember_019e22b5-bdbd-7f84-9250-84a804710626" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CatastropheMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-7208-9bef-e05a991cce0f" xlink:to="loc_us-gaap_CatastropheMember_019e22b5-bdbd-7f84-9250-84a804710626" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_NationwideReinsuranceProgramMember_019e22b5-bdbd-7932-b38e-788754ce3524" xlink:href="all-20260630.xsd#all_NationwideReinsuranceProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CatastrophicEventDomain_019e22b5-bdbd-7208-9bef-e05a991cce0f" xlink:to="loc_all_NationwideReinsuranceProgramMember_019e22b5-bdbd-7932-b38e-788754ce3524" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-703c-9326-14d54cc8724d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems_019e22b5-bdbd-7e3f-95f0-cee420194a67" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_019e22b5-bdbd-703c-9326-14d54cc8724d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyPremiumsEarnedandAccidentandHealthInsurancePremiumsandContractChargesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyPremiumsEarnedandAccidentandHealthInsurancePremiumsandContractChargesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyPremiumsEarnedandAccidentandHealthInsurancePremiumsandContractChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7506-989a-771f8f46b8f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-7dc9-b378-630d04a071f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7506-989a-771f8f46b8f7" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-7dc9-b378-630d04a071f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-744f-adb7-9f71fa6d63b9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-7dc9-b378-630d04a071f0" xlink:to="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-744f-adb7-9f71fa6d63b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-744f-adb7-9f71fa6d63b9_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-744f-adb7-9f71fa6d63b9" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-744f-adb7-9f71fa6d63b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7640-a593-c3ad53a93baa" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e22b5-bdbd-744f-adb7-9f71fa6d63b9" xlink:to="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7640-a593-c3ad53a93baa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember_019e22b5-bdbd-786f-9037-f33110c78a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7640-a593-c3ad53a93baa" xlink:to="loc_us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember_019e22b5-bdbd-786f-9037-f33110c78a4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccidentAndHealthInsuranceSegmentMember_019e22b5-bdbd-7710-a05f-9e1713b3270d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccidentAndHealthInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e22b5-bdbd-7640-a593-c3ad53a93baa" xlink:to="loc_us-gaap_AccidentAndHealthInsuranceSegmentMember_019e22b5-bdbd-7710-a05f-9e1713b3270d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededPremiumsEarned_019e22b5-bdbd-76d6-a4a0-ec8f15bb6a95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CededPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7506-989a-771f8f46b8f7" xlink:to="loc_us-gaap_CededPremiumsEarned_019e22b5-bdbd-76d6-a4a0-ec8f15bb6a95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_CededPremiumsAndContractCharges_019e22b5-bdbd-7801-ab42-b097ca532455" xlink:href="all-20260630.xsd#all_CededPremiumsAndContractCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7506-989a-771f8f46b8f7" xlink:to="loc_all_CededPremiumsAndContractCharges_019e22b5-bdbd-7801-ab42-b097ca532455" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyInsuranceClaimsandClaimsExpenseandAccidentHealthandOtherPolicyBenefitsDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyInsuranceClaimsandClaimsExpenseandAccidentHealthandOtherPolicyBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyInsuranceClaimsandClaimsExpenseandAccidentHealthandOtherPolicyBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7fbf-8f2a-484750c79266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-792d-8000-868519d6c2fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7fbf-8f2a-484750c79266" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-792d-8000-868519d6c2fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bdbd-7b4c-89da-daaf6fc4a457" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-792d-8000-868519d6c2fc" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e22b5-bdbd-7b4c-89da-daaf6fc4a457" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ReinsuranceClaimsBenefitsCededAbstract_019e22b5-bdbd-7917-b7f8-58b622ad1c08" xlink:href="all-20260630.xsd#all_ReinsuranceClaimsBenefitsCededAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7fbf-8f2a-484750c79266" xlink:to="loc_all_ReinsuranceClaimsBenefitsCededAbstract_019e22b5-bdbd-7917-b7f8-58b622ad1c08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ReinsuranceCededAmount_019e22b5-bdbd-72b8-a4c2-1c756b17e5d1" xlink:href="all-20260630.xsd#all_ReinsuranceCededAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_ReinsuranceClaimsBenefitsCededAbstract_019e22b5-bdbd-7917-b7f8-58b622ad1c08" xlink:to="loc_all_ReinsuranceCededAmount_019e22b5-bdbd-72b8-a4c2-1c756b17e5d1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyInsuranceClaimsandClaimsExpenseandAccidentHealthandOtherPolicyBenefitsDetails_1" xlink:type="simple" xlink:href="all-20260630.xsd#ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyInsuranceClaimsandClaimsExpenseandAccidentHealthandOtherPolicyBenefitsDetails_1"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofEffectsofReinsuranceCededandIndemnificationProgramsonPropertyandCasualtyInsuranceClaimsandClaimsExpenseandAccidentHealthandOtherPolicyBenefitsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7fbf-8f2a-484750c79266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-792d-8000-868519d6c2fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7fbf-8f2a-484750c79266" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-792d-8000-868519d6c2fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ReinsuranceClaimsBenefitsCededAbstract_019e22b5-bdbd-7917-b7f8-58b622ad1c08" xlink:href="all-20260630.xsd#all_ReinsuranceClaimsBenefitsCededAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7fbf-8f2a-484750c79266" xlink:to="loc_all_ReinsuranceClaimsBenefitsCededAbstract_019e22b5-bdbd-7917-b7f8-58b622ad1c08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ReinsuranceCededAmount_019e22b5-bdbd-72b8-a4c2-1c756b17e5d1" xlink:href="all-20260630.xsd#all_ReinsuranceCededAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_all_ReinsuranceClaimsBenefitsCededAbstract_019e22b5-bdbd-7917-b7f8-58b622ad1c08" xlink:to="loc_all_ReinsuranceCededAmount_019e22b5-bdbd-72b8-a4c2-1c756b17e5d1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofReinsuranceandIndemnificationRecoverablesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReinsuranceandIndemnificationScheduleofReinsuranceandIndemnificationRecoverablesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofReinsuranceandIndemnificationRecoverablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-738b-87ba-e657ad11cc4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-74c3-8108-dcd0f65117bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-738b-87ba-e657ad11cc4d" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-74c3-8108-dcd0f65117bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7d66-84b2-57234894fa7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-74c3-8108-dcd0f65117bd" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7d66-84b2-57234894fa7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7d66-84b2-57234894fa7d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7d66-84b2-57234894fa7d" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7d66-84b2-57234894fa7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bdbd-706d-bfe4-f0c5f223366d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7d66-84b2-57234894fa7d" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bdbd-706d-bfe4-f0c5f223366d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyAndCasualtyMember_019e22b5-bdbd-736f-9a3a-024e3882c007" xlink:href="all-20260630.xsd#all_PropertyAndCasualtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bdbd-706d-bfe4-f0c5f223366d" xlink:to="loc_all_PropertyAndCasualtyMember_019e22b5-bdbd-736f-9a3a-024e3882c007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AllstateAccidentAndHealthMember_019e22b5-bdbd-75aa-834d-9bd7f5ba2065" xlink:href="all-20260630.xsd#all_AllstateAccidentAndHealthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bdbd-706d-bfe4-f0c5f223366d" xlink:to="loc_all_AllstateAccidentAndHealthMember_019e22b5-bdbd-75aa-834d-9bd7f5ba2065" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesOnPaidLosses_019e22b5-bdbd-7fa5-b641-dccbb7ca8418" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverablesOnPaidLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-738b-87ba-e657ad11cc4d" xlink:to="loc_us-gaap_ReinsuranceRecoverablesOnPaidLosses_019e22b5-bdbd-7fa5-b641-dccbb7ca8418" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019e22b5-bdbd-7c6c-8496-e9bd72e71dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-738b-87ba-e657ad11cc4d" xlink:to="loc_us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments_019e22b5-bdbd-7c6c-8496-e9bd72e71dc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_ReinsuranceAndIndemnificationRecoverablesNet_019e22b5-bdbd-719b-aaef-6d3a742d0aba" xlink:href="all-20260630.xsd#all_ReinsuranceAndIndemnificationRecoverablesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-738b-87ba-e657ad11cc4d" xlink:to="loc_all_ReinsuranceAndIndemnificationRecoverablesNet_019e22b5-bdbd-719b-aaef-6d3a742d0aba" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofRollforwardofCreditLossAllowanceforReinsuranceRecoverablesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#ReinsuranceandIndemnificationScheduleofRollforwardofCreditLossAllowanceforReinsuranceRecoverablesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/ReinsuranceandIndemnificationScheduleofRollforwardofCreditLossAllowanceforReinsuranceRecoverablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7cad-97cb-9ffa612bcc7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-73e2-adf4-377c2851ae21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7cad-97cb-9ffa612bcc7b" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-73e2-adf4-377c2851ae21" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7dd6-bd55-85689caf4444" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019e22b5-bdbd-73e2-adf4-377c2851ae21" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7dd6-bd55-85689caf4444" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7dd6-bd55-85689caf4444_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7dd6-bd55-85689caf4444" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bdbd-7dd6-bd55-85689caf4444_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e22b5-bdbd-74e7-b0dd-a599e55b08b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e22b5-bdbd-7dd6-bd55-85689caf4444" xlink:to="loc_us-gaap_SegmentDomain_019e22b5-bdbd-74e7-b0dd-a599e55b08b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PropertyAndCasualtyMember_019e22b5-bdbd-76fe-8f42-1f88ee6c782f" xlink:href="all-20260630.xsd#all_PropertyAndCasualtyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e22b5-bdbd-74e7-b0dd-a599e55b08b4" xlink:to="loc_all_PropertyAndCasualtyMember_019e22b5-bdbd-76fe-8f42-1f88ee6c782f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward_019e22b5-bdbd-7885-b2cc-d2146d2b2864" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019e22b5-bdbd-7cad-97cb-9ffa612bcc7b" xlink:to="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward_019e22b5-bdbd-7885-b2cc-d2146d2b2864" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesAllowance_019e22b5-bdbd-7c03-b265-1bd719629f9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverablesAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward_019e22b5-bdbd-7885-b2cc-d2146d2b2864" xlink:to="loc_us-gaap_ReinsuranceRecoverablesAllowance_019e22b5-bdbd-7c03-b265-1bd719629f9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossPeriodIncreaseDecrease_019e22b5-bdbd-7693-89e6-88ddd9df19d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableAllowanceForCreditLossPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward_019e22b5-bdbd-7885-b2cc-d2146d2b2864" xlink:to="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossPeriodIncreaseDecrease_019e22b5-bdbd-7693-89e6-88ddd9df19d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceLossOnUncollectibleAccountsInPeriodAmount_019e22b5-bdbd-7261-b525-7ec178a54fd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceLossOnUncollectibleAccountsInPeriodAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward_019e22b5-bdbd-7885-b2cc-d2146d2b2864" xlink:to="loc_us-gaap_ReinsuranceLossOnUncollectibleAccountsInPeriodAmount_019e22b5-bdbd-7261-b525-7ec178a54fd7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesAllowance_019e22b5-bdbd-73fa-8c59-da15810adbab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverablesAllowance"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/CompanyRestructuringNarrativeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#CompanyRestructuringNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/CompanyRestructuringNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-7529-b275-167cdd83c735" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e22b5-bdbd-760e-869e-aada504181d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-7529-b275-167cdd83c735" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e22b5-bdbd-760e-869e-aada504181d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7f68-829b-4b42ea833f3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e22b5-bdbd-760e-869e-aada504181d4" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7f68-829b-4b42ea833f3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-7f68-829b-4b42ea833f3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7f68-829b-4b42ea833f3a" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-7f68-829b-4b42ea833f3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-76d4-9d8d-8ab0d83a392c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7f68-829b-4b42ea833f3a" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-76d4-9d8d-8ab0d83a392c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_019e22b5-bdbd-76f7-b493-6b222433256d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-76d4-9d8d-8ab0d83a392c" xlink:to="loc_us-gaap_EmployeeSeveranceMember_019e22b5-bdbd-76f7-b493-6b222433256d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_019f6373-6b69-7389-b10f-cfc6471eef7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-76d4-9d8d-8ab0d83a392c" xlink:to="loc_us-gaap_FacilityClosingMember_019f6373-6b69-7389-b10f-cfc6471eef7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e22b5-bdbd-7b7f-9e56-603a5f608eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-7529-b275-167cdd83c735" xlink:to="loc_us-gaap_RestructuringCharges_019e22b5-bdbd-7b7f-9e56-603a5f608eb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_019e22b5-bdbd-73ad-a3e7-578e0b5c1d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-7529-b275-167cdd83c735" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_019e22b5-bdbd-73ad-a3e7-578e0b5c1d2c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/CompanyRestructuringScheduleofRestructuringActivityDetails" xlink:type="simple" xlink:href="all-20260630.xsd#CompanyRestructuringScheduleofRestructuringActivityDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/CompanyRestructuringScheduleofRestructuringActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-706e-9f5f-debdbbdcb970" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e22b5-bdbd-761a-aee8-2f51cbb70458" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-706e-9f5f-debdbbdcb970" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e22b5-bdbd-761a-aee8-2f51cbb70458" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7bb7-b19b-8be52b451ddd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e22b5-bdbd-761a-aee8-2f51cbb70458" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7bb7-b19b-8be52b451ddd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-7bb7-b19b-8be52b451ddd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7bb7-b19b-8be52b451ddd" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-7bb7-b19b-8be52b451ddd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-74c8-995a-4bfdc9a91527" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_019e22b5-bdbd-7bb7-b19b-8be52b451ddd" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-74c8-995a-4bfdc9a91527" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_019e22b5-bdbd-7452-aaed-cf11fae8e639" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-74c8-995a-4bfdc9a91527" xlink:to="loc_us-gaap_EmployeeSeveranceMember_019e22b5-bdbd-7452-aaed-cf11fae8e639" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_019e22b5-bdbd-7e38-b55a-ae1313e230d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_019e22b5-bdbd-74c8-995a-4bfdc9a91527" xlink:to="loc_us-gaap_FacilityClosingMember_019e22b5-bdbd-7e38-b55a-ae1313e230d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_019e22b5-bdbd-79aa-88cf-7ce5b6fc7ee2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e22b5-bdbd-706e-9f5f-debdbbdcb970" xlink:to="loc_us-gaap_RestructuringReserveRollForward_019e22b5-bdbd-79aa-88cf-7ce5b6fc7ee2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019e22b5-bdbd-7ba2-9232-8819c3ae92ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e22b5-bdbd-79aa-88cf-7ce5b6fc7ee2" xlink:to="loc_us-gaap_RestructuringReserve_019e22b5-bdbd-7ba2-9232-8819c3ae92ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_019e22b5-bdbd-75b4-b0a9-6ebfe7ef0911" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInRestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e22b5-bdbd-79aa-88cf-7ce5b6fc7ee2" xlink:to="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_019e22b5-bdbd-75b4-b0a9-6ebfe7ef0911" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_019e22b5-bdbd-7acd-8881-e3c50b324e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserveAccrualAdjustment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e22b5-bdbd-79aa-88cf-7ce5b6fc7ee2" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_019e22b5-bdbd-7acd-8881-e3c50b324e3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_PaymentsForRestructuringAndOtherNonCashCharges_019e22b5-bdbd-726a-b715-d8313ff3c3d8" xlink:href="all-20260630.xsd#all_PaymentsForRestructuringAndOtherNonCashCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_019e22b5-bdbd-79aa-88cf-7ce5b6fc7ee2" xlink:to="loc_all_PaymentsForRestructuringAndOtherNonCashCharges_019e22b5-bdbd-726a-b715-d8313ff3c3d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_019e22b5-bdbd-70ed-861e-0874cacf2537" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/GuaranteesandContingentLiabilitiesDetails" xlink:type="simple" xlink:href="all-20260630.xsd#GuaranteesandContingentLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/GuaranteesandContingentLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsLineItems_019e22b5-bdbd-743f-ba7a-6b875fe9d234" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_019e22b5-bdbd-7b90-8921-2e2d98417f75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGuaranteeObligationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_019e22b5-bdbd-743f-ba7a-6b875fe9d234" xlink:to="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_019e22b5-bdbd-7b90-8921-2e2d98417f75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e22b5-bdbd-7a35-8081-4e2b189c3649" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_019e22b5-bdbd-7b90-8921-2e2d98417f75" xlink:to="loc_srt_RangeAxis_019e22b5-bdbd-7a35-8081-4e2b189c3649" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e22b5-bdbd-7a35-8081-4e2b189c3649_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e22b5-bdbd-7a35-8081-4e2b189c3649" xlink:to="loc_srt_RangeMember_019e22b5-bdbd-7a35-8081-4e2b189c3649_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e22b5-bdbd-7ffa-aa26-4715fc7e54c7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e22b5-bdbd-7a35-8081-4e2b189c3649" xlink:to="loc_srt_RangeMember_019e22b5-bdbd-7ffa-aa26-4715fc7e54c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e22b5-bdbd-7c2f-8a6a-2f9c4acba246" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e22b5-bdbd-7ffa-aa26-4715fc7e54c7" xlink:to="loc_srt_MinimumMember_019e22b5-bdbd-7c2f-8a6a-2f9c4acba246" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e22b5-bdbd-7edf-bb3f-2dae15e042b3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e22b5-bdbd-7ffa-aa26-4715fc7e54c7" xlink:to="loc_srt_MaximumMember_019e22b5-bdbd-7edf-bb3f-2dae15e042b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_LossContingencyReasonablyPossibleAdditionalLossesPretaxEstimate_019e22b5-bdbd-7a3f-9e3b-31fb8d7fdfaf" xlink:href="all-20260630.xsd#all_LossContingencyReasonablyPossibleAdditionalLossesPretaxEstimate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_019e22b5-bdbd-743f-ba7a-6b875fe9d234" xlink:to="loc_all_LossContingencyReasonablyPossibleAdditionalLossesPretaxEstimate_019e22b5-bdbd-7a3f-9e3b-31fb8d7fdfaf" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/BenefitPlansScheduleofComponentsofNetCostBenefitforPensionandOtherPostretirementPlansDetails" xlink:type="simple" xlink:href="all-20260630.xsd#BenefitPlansScheduleofComponentsofNetCostBenefitforPensionandOtherPostretirementPlansDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/BenefitPlansScheduleofComponentsofNetCostBenefitforPensionandOtherPostretirementPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e22b5-bdbd-7d89-8771-447fd3d88260" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e22b5-bdbd-7d89-8771-447fd3d88260" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-79b2-a662-7ee42f2d3cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e22b5-bdbd-7d89-8771-447fd3d88260" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-79b2-a662-7ee42f2d3cc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-79b2-a662-7ee42f2d3cc1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-79b2-a662-7ee42f2d3cc1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-79b2-a662-7ee42f2d3cc1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-765d-9a90-a307b6555e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-79b2-a662-7ee42f2d3cc1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-765d-9a90-a307b6555e7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e22b5-bdbd-728a-8622-861cc27db55e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-765d-9a90-a307b6555e7c" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e22b5-bdbd-728a-8622-861cc27db55e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e22b5-bdbd-7108-bf4b-aab103680412" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-765d-9a90-a307b6555e7c" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e22b5-bdbd-7108-bf4b-aab103680412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DefinedBenefitPlanServiceCostNet_019e22b5-bdbd-7214-9c16-436038240dea" xlink:href="all-20260630.xsd#all_DefinedBenefitPlanServiceCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_all_DefinedBenefitPlanServiceCostNet_019e22b5-bdbd-7214-9c16-436038240dea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_019e22b5-bdbd-76ca-80f4-5a7496dbe3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_019e22b5-bdbd-76ca-80f4-5a7496dbe3c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019e22b5-bdbd-7476-8b9e-e779277437e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019e22b5-bdbd-7476-8b9e-e779277437e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_019e22b5-bdbd-7b54-a469-51f36c6b1a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_019e22b5-bdbd-7b54-a469-51f36c6b1a6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DefinedBenefitPlanOtherOperatingCostsAndExpenses_019e22b5-bdbd-7b54-8a5a-c19011417b52" xlink:href="all-20260630.xsd#all_DefinedBenefitPlanOtherOperatingCostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_all_DefinedBenefitPlanOtherOperatingCostsAndExpenses_019e22b5-bdbd-7b54-8a5a-c19011417b52" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_019e22b5-bdbd-7cb2-9b63-eaf47fd6269c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_019e22b5-bdbd-7cb2-9b63-eaf47fd6269c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_DefinedBenefitPlanNetPeriodicBenefitCostCreditRemeasurementOfPlanAssets_019e22b5-bdbd-77d8-8e16-2c677a5752ed" xlink:href="all-20260630.xsd#all_DefinedBenefitPlanNetPeriodicBenefitCostCreditRemeasurementOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_all_DefinedBenefitPlanNetPeriodicBenefitCostCreditRemeasurementOfPlanAssets_019e22b5-bdbd-77d8-8e16-2c677a5752ed" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bdbd-72f2-b834-a7e5159f3aee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bdbd-72f2-b834-a7e5159f3aee" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019e22b5-bdbd-7b1e-aef9-732817ec5c87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7d69-8f96-fa40821ba91c" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019e22b5-bdbd-7b1e-aef9-732817ec5c87" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/BenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="all-20260630.xsd#BenefitPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/BenefitPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7cee-af17-1632b13f84f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e22b5-bdbd-72fe-bc05-3514ef97e867" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7cee-af17-1632b13f84f6" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e22b5-bdbd-72fe-bc05-3514ef97e867" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-7ff3-9618-e064fd8fcc07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e22b5-bdbd-72fe-bc05-3514ef97e867" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-7ff3-9618-e064fd8fcc07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-7ff3-9618-e064fd8fcc07_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-7ff3-9618-e064fd8fcc07" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-7ff3-9618-e064fd8fcc07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-7f74-9020-5cd59756590f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e22b5-bdbd-7ff3-9618-e064fd8fcc07" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-7f74-9020-5cd59756590f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e22b5-bdbd-7c89-9944-dfc28d474f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e22b5-bdbd-7f74-9020-5cd59756590f" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e22b5-bdbd-7c89-9944-dfc28d474f3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bdbd-7260-92cd-7f7d7632dc95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7cee-af17-1632b13f84f6" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_019e22b5-bdbd-7260-92cd-7f7d7632dc95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_019e22b5-bdbd-71fa-b13a-559378fc863f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e22b5-bdbd-7cee-af17-1632b13f84f6" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_019e22b5-bdbd-71fa-b13a-559378fc863f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.allstate.com/role/OtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="all-20260630.xsd#OtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.allstate.com/role/OtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bdbd-733a-8097-48cf2a493ed8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e22b5-bdbd-7369-a33a-e31bb44501eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bdbd-733a-8097-48cf2a493ed8" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e22b5-bdbd-7369-a33a-e31bb44501eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bdbd-711e-a081-d08e89b689d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e22b5-bdbd-7369-a33a-e31bb44501eb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bdbd-711e-a081-d08e89b689d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-711e-a081-d08e89b689d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bdbd-711e-a081-d08e89b689d0" xlink:to="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-711e-a081-d08e89b689d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-7400-b5fb-128d47c8bfb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e22b5-bdbd-711e-a081-d08e89b689d0" xlink:to="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-7400-b5fb-128d47c8bfb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e22b5-bdbd-78c0-a0bd-8656254debdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-7400-b5fb-128d47c8bfb0" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019e22b5-bdbd-78c0-a0bd-8656254debdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e22b5-bdbd-7e08-bd2a-db5d5f77b9d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-7400-b5fb-128d47c8bfb0" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e22b5-bdbd-7e08-bd2a-db5d5f77b9d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e22b5-bdbd-77bb-b139-cea5aa870f03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-7400-b5fb-128d47c8bfb0" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e22b5-bdbd-77bb-b139-cea5aa870f03" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_all_AccumulatedFuturePolicyBenefitAdjustmentDiscountRateParentMember_019e22b5-bdbd-7fae-971b-45abfeb8efd1" xlink:href="all-20260630.xsd#all_AccumulatedFuturePolicyBenefitAdjustmentDiscountRateParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e22b5-bdbd-7400-b5fb-128d47c8bfb0" xlink:to="loc_all_AccumulatedFuturePolicyBenefitAdjustmentDiscountRateParentMember_019e22b5-bdbd-7fae-971b-45abfeb8efd1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_019e22b5-bdbd-74b4-a2b7-0a83b8a4cdef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bdbd-733a-8097-48cf2a493ed8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_019e22b5-bdbd-74b4-a2b7-0a83b8a4cdef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019e22b5-bdbd-74d0-b4f0-5643ab4c4f34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_019e22b5-bdbd-74b4-a2b7-0a83b8a4cdef" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019e22b5-bdbd-74d0-b4f0-5643ab4c4f34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019e22b5-bdbd-73a3-95e7-93934ddc3946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_019e22b5-bdbd-74b4-a2b7-0a83b8a4cdef" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019e22b5-bdbd-73a3-95e7-93934ddc3946" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019e22b5-bdbd-7374-b60b-0c0cc097ead6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_019e22b5-bdbd-74b4-a2b7-0a83b8a4cdef" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019e22b5-bdbd-7374-b60b-0c0cc097ead6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_019e22b5-bdbd-7253-a9d1-f3839f9aafe0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bdbd-733a-8097-48cf2a493ed8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_019e22b5-bdbd-7253-a9d1-f3839f9aafe0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_019e22b5-bdbd-78ce-856c-2cd66773a2c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_019e22b5-bdbd-7253-a9d1-f3839f9aafe0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_019e22b5-bdbd-78ce-856c-2cd66773a2c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e22b5-bdbd-7c31-abc0-2d96b30def85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_019e22b5-bdbd-7253-a9d1-f3839f9aafe0" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e22b5-bdbd-7c31-abc0-2d96b30def85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_019e22b5-bdbd-75f8-b1a5-799c93eb2fe7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_019e22b5-bdbd-7253-a9d1-f3839f9aafe0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_019e22b5-bdbd-75f8-b1a5-799c93eb2fe7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e22b5-bdbd-7374-ad43-898778bfbc64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e22b5-bdbd-733a-8097-48cf2a493ed8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e22b5-bdbd-7374-ad43-898778bfbc64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e22b5-bdbd-7f95-a248-32d94f5950b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e22b5-bdbd-7374-ad43-898778bfbc64" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e22b5-bdbd-7f95-a248-32d94f5950b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019e22b5-bdbd-7619-8a08-b1fe87fff00a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e22b5-bdbd-7374-ad43-898778bfbc64" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019e22b5-bdbd-7619-8a08-b1fe87fff00a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e22b5-bdbd-7b5b-b803-5a25b4a30326" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e22b5-bdbd-7374-ad43-898778bfbc64" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e22b5-bdbd-7b5b-b803-5a25b4a30326" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses" xlink:type="arc" order="691"/>
  </link:definitionLink>
</link:linkbase>
