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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:8a35f08e-5b72-430c-b529-b95236d61de4,g:aa83ae3f-7851-4261-96da-87c2e8b8843b-->
<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://libertyglobal.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="lbtya-20230510.xsd#DocumentandEntityInformation"/>
  <link:definitionLink xlink:role="http://libertyglobal.com/role/DocumentandEntityInformation" xlink:type="extended" id="iaf54d049e54f4cbaa97d91c7eb2bdf49_DocumentandEntityInformation">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_55c6f72d-9f9c-4534-905b-070fb282ea60" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityCentralIndexKey_55c6f72d-9f9c-4534-905b-070fb282ea60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_1368199b-7530-44ca-96e1-087804fe0e05" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_AmendmentFlag_1368199b-7530-44ca-96e1-087804fe0e05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_be8e4865-4c94-4d42-920b-3cb26c028be7" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_DocumentType_be8e4865-4c94-4d42-920b-3cb26c028be7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_ac50c165-d4f3-40cf-8ff6-472ad6c1c437" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_DocumentPeriodEndDate_ac50c165-d4f3-40cf-8ff6-472ad6c1c437" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_1b8908a2-799e-49ec-889d-cf7dd899a1ae" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityRegistrantName_1b8908a2-799e-49ec-889d-cf7dd899a1ae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_8cfe3075-2a99-4c4c-bbcb-810987e85c63" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityIncorporationStateCountryCode_8cfe3075-2a99-4c4c-bbcb-810987e85c63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_7ac97ad5-ce05-4b3e-a528-f087ab86778b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityFileNumber_7ac97ad5-ce05-4b3e-a528-f087ab86778b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_e552034a-0f91-4a96-a713-1768c407eaf1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityTaxIdentificationNumber_e552034a-0f91-4a96-a713-1768c407eaf1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_0566d216-a878-41b7-a083-63812ed3cdf0" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityAddressAddressLine1_0566d216-a878-41b7-a083-63812ed3cdf0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_78bfd414-a35d-4aa2-8c3f-67f10898bfb8" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityAddressAddressLine2_78bfd414-a35d-4aa2-8c3f-67f10898bfb8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_28369e7e-9772-4af8-9dc9-57a67c6df5d4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityAddressCityOrTown_28369e7e-9772-4af8-9dc9-57a67c6df5d4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry_125ae535-578a-4018-a349-6ef2a4044475" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCountry"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityAddressCountry_125ae535-578a-4018-a349-6ef2a4044475" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_ddc6d18c-fb23-45c7-9ff7-93c8f329bec3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityAddressPostalZipCode_ddc6d18c-fb23-45c7-9ff7-93c8f329bec3" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CountryRegion_40389cb3-4082-441c-94e3-cbeaff20a47b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CountryRegion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_CountryRegion_40389cb3-4082-441c-94e3-cbeaff20a47b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_ba66d33f-ab4e-49a4-8b20-6366345979e0" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_CityAreaCode_ba66d33f-ab4e-49a4-8b20-6366345979e0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_e9e90fea-2754-453a-9635-a16533258233" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_LocalPhoneNumber_e9e90fea-2754-453a-9635-a16533258233" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_9a9bd60e-4ebd-40ae-8cc5-a79321a8b3e9" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_Security12bTitle_9a9bd60e-4ebd-40ae-8cc5-a79321a8b3e9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_0a0c0060-30cf-414f-9c8a-3cab89e9b7e9" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_TradingSymbol_0a0c0060-30cf-414f-9c8a-3cab89e9b7e9" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_91e5ae6f-c141-4087-950a-b9a685134feb" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_SecurityExchangeName_91e5ae6f-c141-4087-950a-b9a685134feb" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_510b225a-d0c8-48b4-977e-1136110b53e8" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_WrittenCommunications_510b225a-d0c8-48b4-977e-1136110b53e8" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_5bd66796-945c-46a2-b859-4f5f3bcb10cf" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_SolicitingMaterial_5bd66796-945c-46a2-b859-4f5f3bcb10cf" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_0c218eeb-f9b0-4cc8-8271-1d4e863bc1c5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_PreCommencementTenderOffer_0c218eeb-f9b0-4cc8-8271-1d4e863bc1c5" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_8544a341-8df8-4eca-93cd-c0ae3128ef94" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_8544a341-8df8-4eca-93cd-c0ae3128ef94" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_914917f7-e85f-4259-99dd-adaa0df1451a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntityEmergingGrowthCompany_914917f7-e85f-4259-99dd-adaa0df1451a" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_7edadc36-30a4-4426-802a-97c1604ae6ab" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_d6d81a9a-71a1-4804-8384-20a6f54de04a" xlink:to="loc_dei_EntitiesTable_7edadc36-30a4-4426-802a-97c1604ae6ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_47c3d5fc-4602-4b96-84b6-502cf5d00561" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_7edadc36-30a4-4426-802a-97c1604ae6ab" xlink:to="loc_us-gaap_StatementClassOfStockAxis_47c3d5fc-4602-4b96-84b6-502cf5d00561" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_47c3d5fc-4602-4b96-84b6-502cf5d00561_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_47c3d5fc-4602-4b96-84b6-502cf5d00561" xlink:to="loc_us-gaap_ClassOfStockDomain_47c3d5fc-4602-4b96-84b6-502cf5d00561_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3c41772b-41f1-4a88-85cd-14c9bdca3d54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_47c3d5fc-4602-4b96-84b6-502cf5d00561" xlink:to="loc_us-gaap_ClassOfStockDomain_3c41772b-41f1-4a88-85cd-14c9bdca3d54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_c1300d57-a5a5-4154-998f-5da0ecd544d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3c41772b-41f1-4a88-85cd-14c9bdca3d54" xlink:to="loc_us-gaap_CommonClassAMember_c1300d57-a5a5-4154-998f-5da0ecd544d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_285a827d-1f7c-4976-9ecf-76d4eb64c6cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3c41772b-41f1-4a88-85cd-14c9bdca3d54" xlink:to="loc_us-gaap_CommonClassBMember_285a827d-1f7c-4976-9ecf-76d4eb64c6cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassCMember_053c2db7-ef9e-4068-adda-0a0762ab4671" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonClassCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3c41772b-41f1-4a88-85cd-14c9bdca3d54" xlink:to="loc_us-gaap_CommonClassCMember_053c2db7-ef9e-4068-adda-0a0762ab4671" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
