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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e3cb4-4766-7f6a-8ab6-22693a9a0371,g:f1a426ec-1565-472c-bf23-491057ad6344-->
<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://corporate.discovery.com/role/CoverPage" xlink:type="simple" xlink:href="disca-20260519.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://corporate.discovery.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019e3cb4-4767-7e1f-8f2b-2ca9340a9b7d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntitiesTable_019e3cb4-4767-7e1f-8f2b-2ca9340a9b7d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019e3cb4-4767-7297-9faa-4c028fb05543" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019e3cb4-4767-7e1f-8f2b-2ca9340a9b7d" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019e3cb4-4767-7297-9faa-4c028fb05543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7297-9faa-4c028fb05543_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e3cb4-4767-7297-9faa-4c028fb05543" xlink:to="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7297-9faa-4c028fb05543_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e3cb4-4767-7297-9faa-4c028fb05543" xlink:to="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019e3cb4-4767-723d-b659-b49ae3f51f15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:to="loc_us-gaap_CommonClassAMember_019e3cb4-4767-723d-b659-b49ae3f51f15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_disca_SeniorNotesDue20304.302Member_019e3cb4-4767-77e1-8cdc-a32f4de666f1" xlink:href="disca-20260519.xsd#disca_SeniorNotesDue20304.302Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:to="loc_disca_SeniorNotesDue20304.302Member_019e3cb4-4767-77e1-8cdc-a32f4de666f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_disca_SeniorNotesDue20304.302AMember_019e3cb4-4767-79b7-a9e1-531f70c72b17" xlink:href="disca-20260519.xsd#disca_SeniorNotesDue20304.302AMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:to="loc_disca_SeniorNotesDue20304.302AMember_019e3cb4-4767-79b7-a9e1-531f70c72b17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_disca_SeniorNotesDue20304.693Member_019e3cb4-4767-7cd6-89bc-393844a23892" xlink:href="disca-20260519.xsd#disca_SeniorNotesDue20304.693Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:to="loc_disca_SeniorNotesDue20304.693Member_019e3cb4-4767-7cd6-89bc-393844a23892" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_disca_SeniorNotesDue20304.693AMember_019e3cb4-4767-7d5e-b74d-564ac072ef68" xlink:href="disca-20260519.xsd#disca_SeniorNotesDue20304.693AMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e3cb4-4767-7374-8e48-ec6d0fd7ac67" xlink:to="loc_disca_SeniorNotesDue20304.693AMember_019e3cb4-4767-7d5e-b74d-564ac072ef68" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e3cb4-4767-7bbc-a00e-3cdc6092aea5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_DocumentType_019e3cb4-4767-7bbc-a00e-3cdc6092aea5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e3cb4-4767-7dec-a6ae-a1d3f4e8dced" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_DocumentPeriodEndDate_019e3cb4-4767-7dec-a6ae-a1d3f4e8dced" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e3cb4-4767-7ed0-ae7e-d9835758b814" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityRegistrantName_019e3cb4-4767-7ed0-ae7e-d9835758b814" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e3cb4-4767-7160-a242-bbb3e71e3530" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityFileNumber_019e3cb4-4767-7160-a242-bbb3e71e3530" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e3cb4-4767-7363-8b5a-9b07bb9c3f3b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e3cb4-4767-7363-8b5a-9b07bb9c3f3b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e3cb4-4767-7351-9048-b48e82e1fec1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e3cb4-4767-7351-9048-b48e82e1fec1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e3cb4-4767-729b-b49f-af6b2f08b948" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityAddressAddressLine1_019e3cb4-4767-729b-b49f-af6b2f08b948" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e3cb4-4767-720f-a689-a1299772637a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityAddressCityOrTown_019e3cb4-4767-720f-a689-a1299772637a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e3cb4-4767-7333-bd50-6c69ad8d91bd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityAddressStateOrProvince_019e3cb4-4767-7333-bd50-6c69ad8d91bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e3cb4-4767-752c-a83a-8ed1ffa3883f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityAddressPostalZipCode_019e3cb4-4767-752c-a83a-8ed1ffa3883f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e3cb4-4767-7898-8260-fdf6a0c70cd2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_CityAreaCode_019e3cb4-4767-7898-8260-fdf6a0c70cd2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e3cb4-4767-799d-8234-a3c7a9cf95b2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_LocalPhoneNumber_019e3cb4-4767-799d-8234-a3c7a9cf95b2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019e3cb4-4767-7721-b949-e6a53ecca6ed" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_WrittenCommunications_019e3cb4-4767-7721-b949-e6a53ecca6ed" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019e3cb4-4767-76f1-92bb-02906ad5740d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_SolicitingMaterial_019e3cb4-4767-76f1-92bb-02906ad5740d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019e3cb4-4767-71bd-8fac-2f3a1f6ce061" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_PreCommencementTenderOffer_019e3cb4-4767-71bd-8fac-2f3a1f6ce061" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019e3cb4-4767-78e5-a848-e3422ca2f7e6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019e3cb4-4767-78e5-a848-e3422ca2f7e6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e3cb4-4767-7906-a13f-d11e0e912a3e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_Security12bTitle_019e3cb4-4767-7906-a13f-d11e0e912a3e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e3cb4-4767-7af9-8ff3-a570e5dc6b73" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_TradingSymbol_019e3cb4-4767-7af9-8ff3-a570e5dc6b73" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e3cb4-4767-77bd-a19b-283128a9568f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_SecurityExchangeName_019e3cb4-4767-77bd-a19b-283128a9568f" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e3cb4-4767-7de0-812f-db396cc56ead" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e3cb4-4767-7de0-812f-db396cc56ead" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e3cb4-4767-7796-9526-704a04236556" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_EntityCentralIndexKey_019e3cb4-4767-7796-9526-704a04236556" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e3cb4-4767-7c6f-892f-0e73fa337ccd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e3cb4-4767-757d-96a0-99c02708e617" xlink:to="loc_dei_AmendmentFlag_019e3cb4-4767-7c6f-892f-0e73fa337ccd" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
