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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e4600-2450-70ae-9558-10abafc57381,g:387cb489-b267-4c09-94d8-4504e7aebf7f-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:lyb="http://www.lyb.com/20260630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.lyb.com/20260630">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lyb-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lyb-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lyb-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lyb-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.lyb.com/role/Cover">
        <link:definition>0000001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofIncome" roleURI="http://www.lyb.com/role/ConsolidatedStatementsofIncome">
        <link:definition>9952151 - Statement - Consolidated Statements of Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.lyb.com/role/ConsolidatedStatementsofComprehensiveIncome">
        <link:definition>9952152 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.lyb.com/role/ConsolidatedBalanceSheets">
        <link:definition>9952153 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParentheticals" roleURI="http://www.lyb.com/role/ConsolidatedBalanceSheetsParentheticals">
        <link:definition>9952154 - Statement - Consolidated Balance Sheets (Parentheticals)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlows" roleURI="http://www.lyb.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>9952155 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofShareholdersEquity" roleURI="http://www.lyb.com/role/ConsolidatedStatementsofShareholdersEquity">
        <link:definition>9952156 - Statement - Consolidated Statements of Shareholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofShareholdersEquityParentheticals" roleURI="http://www.lyb.com/role/ConsolidatedStatementsofShareholdersEquityParentheticals">
        <link:definition>9952157 - Statement - Consolidated Statements of Shareholders' Equity (Parentheticals)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentation" roleURI="http://www.lyb.com/role/BasisofPresentation">
        <link:definition>9952158 - Disclosure - Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountingandReportingChanges" roleURI="http://www.lyb.com/role/AccountingandReportingChanges">
        <link:definition>9952159 - Disclosure - Accounting and Reporting Changes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperations" roleURI="http://www.lyb.com/role/DiscontinuedOperations">
        <link:definition>9952160 - Disclosure - Discontinued Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Revenues" roleURI="http://www.lyb.com/role/Revenues">
        <link:definition>9952161 - Disclosure - Revenues</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountsReceivable" roleURI="http://www.lyb.com/role/AccountsReceivable">
        <link:definition>9952162 - Disclosure - Accounts Receivable</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventories" roleURI="http://www.lyb.com/role/Inventories">
        <link:definition>9952163 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Debt" roleURI="http://www.lyb.com/role/Debt">
        <link:definition>9952164 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurements" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurements">
        <link:definition>9952165 - Disclosure - Financial Instruments and Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.lyb.com/role/IncomeTaxes">
        <link:definition>9952166 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.lyb.com/role/CommitmentsandContingencies">
        <link:definition>9952167 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterests" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterests">
        <link:definition>9952168 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PerShareData" roleURI="http://www.lyb.com/role/PerShareData">
        <link:definition>9952169 - Disclosure - Per Share Data</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandRelatedInformation" roleURI="http://www.lyb.com/role/SegmentandRelatedInformation">
        <link:definition>9952170 - Disclosure - Segment and Related Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountingandReportingChangesPolicies" roleURI="http://www.lyb.com/role/AccountingandReportingChangesPolicies">
        <link:definition>9955511 - Disclosure - Accounting and Reporting Changes (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperationsTables" roleURI="http://www.lyb.com/role/DiscontinuedOperationsTables">
        <link:definition>9955512 - Disclosure - Discontinued Operations (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesTables" roleURI="http://www.lyb.com/role/RevenuesTables">
        <link:definition>9955513 - Disclosure - Revenues (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesTables" roleURI="http://www.lyb.com/role/InventoriesTables">
        <link:definition>9955514 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtTables" roleURI="http://www.lyb.com/role/DebtTables">
        <link:definition>9955515 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsTables" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsTables">
        <link:definition>9955516 - Disclosure - Financial Instruments and Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsTables" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsTables">
        <link:definition>9955517 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PerShareDataTables" roleURI="http://www.lyb.com/role/PerShareDataTables">
        <link:definition>9955518 - Disclosure - Per Share Data (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandRelatedInformationTables" roleURI="http://www.lyb.com/role/SegmentandRelatedInformationTables">
        <link:definition>9955519 - Disclosure - Segment and Related Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DiscontinuedOperationsDetails" roleURI="http://www.lyb.com/role/DiscontinuedOperationsDetails">
        <link:definition>9955520 - Disclosure - Discontinued Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesNarrativeDetails" roleURI="http://www.lyb.com/role/RevenuesNarrativeDetails">
        <link:definition>9955521 - Disclosure - Revenues - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesKeyproductsDetails" roleURI="http://www.lyb.com/role/RevenuesKeyproductsDetails">
        <link:definition>9955522 - Disclosure - Revenues - Key products (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuesGeographiclocationsDetails" roleURI="http://www.lyb.com/role/RevenuesGeographiclocationsDetails">
        <link:definition>9955523 - Disclosure - Revenues - Geographic locations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountsReceivableNarrativeDetails" roleURI="http://www.lyb.com/role/AccountsReceivableNarrativeDetails">
        <link:definition>9955524 - Disclosure - Accounts Receivable - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesScheduleofComponentsDetails" roleURI="http://www.lyb.com/role/InventoriesScheduleofComponentsDetails">
        <link:definition>9955525 - Disclosure - Inventories - Schedule of Components (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtLongtermdebtDetails" roleURI="http://www.lyb.com/role/DebtLongtermdebtDetails">
        <link:definition>9955526 - Disclosure - Debt - Long-term debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtDescriptionoffairvalueadjustmentsforguaranteednotesDetails" roleURI="http://www.lyb.com/role/DebtDescriptionoffairvalueadjustmentsforguaranteednotesDetails">
        <link:definition>9955527 - Disclosure - Debt - Description of fair value adjustments for guaranteed notes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtDescriptionoflongtermdebtDetails" roleURI="http://www.lyb.com/role/DebtDescriptionoflongtermdebtDetails">
        <link:definition>9955528 - Disclosure - Debt - Description of long-term debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtDescriptionofshorttermdebtDetails" roleURI="http://www.lyb.com/role/DebtDescriptionofshorttermdebtDetails">
        <link:definition>9955529 - Disclosure - Debt - Description of short-term debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsSummaryofderivativeandnonderivativefinancialinstrumentsoutstandingmeasuredatfairvalueonarecurringbasisDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofderivativeandnonderivativefinancialinstrumentsoutstandingmeasuredatfairvalueonarecurringbasisDetails">
        <link:definition>9955530 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of derivative and non-derivative financial instruments outstanding measured at fair value on a recurring basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsSummaryofderivativeandnonderivativefinancialinstrumentsoutstandingmeasuredatfairvalueonarecurringbasisDetails_1" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofderivativeandnonderivativefinancialinstrumentsoutstandingmeasuredatfairvalueonarecurringbasisDetails_1">
        <link:definition>9955530 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of derivative and non-derivative financial instruments outstanding measured at fair value on a recurring basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsCarryingvalueandestimatedfairvalueofnonderivativefinancialinstrumentsDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsCarryingvalueandestimatedfairvalueofnonderivativefinancialinstrumentsDetails">
        <link:definition>9955531 - Disclosure - Financial Instruments and Fair Value Measurements - Carrying value and estimated fair value of non-derivative financial instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsSummaryofcommodityderivativesDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofcommodityderivativesDetails">
        <link:definition>9955532 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of commodity derivatives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsSummaryofinterestratehedgesDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofinterestratehedgesDetails">
        <link:definition>9955533 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of interest rate hedges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsSummaryofforeigncurrencyhedgesDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofforeigncurrencyhedgesDetails">
        <link:definition>9955534 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of foreign currency hedges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsPretaxeffectofderivativeinstrumentschargeddirectlytoincomeDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsPretaxeffectofderivativeinstrumentschargeddirectlytoincomeDetails">
        <link:definition>9955535 - Disclosure - Financial Instruments and Fair Value Measurements - Pretax effect of derivative instruments charged directly to income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsPretaxeffectofderivativeinstrumentschargeddirectlytoincomeDetails_1" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsPretaxeffectofderivativeinstrumentschargeddirectlytoincomeDetails_1">
        <link:definition>9955535 - Disclosure - Financial Instruments and Fair Value Measurements - Pretax effect of derivative instruments charged directly to income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsandFairValueMeasurementsSummaryofmarketablesecuritiesnarrativeDetails" roleURI="http://www.lyb.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofmarketablesecuritiesnarrativeDetails">
        <link:definition>9955536 - Disclosure - Financial Instruments and Fair Value Measurements - Summary of marketable securities narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesNarrativeDetails" roleURI="http://www.lyb.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>9955537 - Disclosure - Income Taxes - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesNarrativeDetails" roleURI="http://www.lyb.com/role/CommitmentsandContingenciesNarrativeDetails">
        <link:definition>9955538 - Disclosure - Commitments and Contingencies - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsDividenddistributionsDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsDividenddistributionsDetails">
        <link:definition>9955539 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Dividend distributions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsNarrativeDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsNarrativeDetails">
        <link:definition>9955540 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsSharerepurchaseauthorizationDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsSharerepurchaseauthorizationDetails">
        <link:definition>9955541 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Share repurchase authorization (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsOrdinarysharesDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsOrdinarysharesDetails">
        <link:definition>9955542 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Ordinary shares (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsTreasurysharesDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsTreasurysharesDetails">
        <link:definition>9955543 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Treasury shares (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsComponentsofaccumulatedothercomprehensiveincomelossDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsComponentsofaccumulatedothercomprehensiveincomelossDetails">
        <link:definition>9955544 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Components of accumulated other comprehensive income (loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsReclassificationoutofaccumulatedothercomprehensiveincomelossDetails" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsReclassificationoutofaccumulatedothercomprehensiveincomelossDetails">
        <link:definition>9955545 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Reclassification out of accumulated other comprehensive income (loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsReclassificationoutofaccumulatedothercomprehensiveincomelossDetails_1" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsReclassificationoutofaccumulatedothercomprehensiveincomelossDetails_1">
        <link:definition>9955545 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Reclassification out of accumulated other comprehensive income (loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareholdersEquityandRedeemableNoncontrollingInterestsReclassificationoutofaccumulatedothercomprehensiveincomelossDetails_2" roleURI="http://www.lyb.com/role/ShareholdersEquityandRedeemableNoncontrollingInterestsReclassificationoutofaccumulatedothercomprehensiveincomelossDetails_2">
        <link:definition>9955545 - Disclosure - Shareholders' Equity and Redeemable Non-controlling Interests - Reclassification out of accumulated other comprehensive income (loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PerShareDataEarningspersharebasicanddilutedDetails" roleURI="http://www.lyb.com/role/PerShareDataEarningspersharebasicanddilutedDetails">
        <link:definition>9955546 - Disclosure - Per Share Data - Earnings per share, basic and diluted (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandRelatedInformationSummarizedfinancialinformationDetails" roleURI="http://www.lyb.com/role/SegmentandRelatedInformationSummarizedfinancialinformationDetails">
        <link:definition>9955547 - Disclosure - Segment and Related Information - Summarized financial information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandRelatedInformationNarrativeDetails" roleURI="http://www.lyb.com/role/SegmentandRelatedInformationNarrativeDetails">
        <link:definition>9955548 - Disclosure - Segment and Related Information - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentandRelatedInformationReconciliationofEBITDAtoincomelossfromcontinuingoperationsbeforeincometaxesDetails" roleURI="http://www.lyb.com/role/SegmentandRelatedInformationReconciliationofEBITDAtoincomelossfromcontinuingoperationsbeforeincometaxesDetails">
        <link:definition>9955549 - Disclosure - Segment and Related Information - Reconciliation of EBITDA to income (loss) from continuing operations before income taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="lyb_DividendsRedeemableNonControllingInterestsCash" abstract="false" name="DividendsRedeemableNonControllingInterestsCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_NetIncomeAvailableToCompanyShareholders" abstract="false" name="NetIncomeAvailableToCompanyShareholders" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_RedeemableNonControllingInterestsDividendsPerShare" abstract="false" name="RedeemableNonControllingInterestsDividendsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="lyb_FinancialInstrumentsAndFairValueMeasurementsTextBlock" abstract="false" name="FinancialInstrumentsAndFairValueMeasurementsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_ShareholdersEquityAndRedeemableNonControllingInterestsAbstractAbstract" abstract="true" name="ShareholdersEquityAndRedeemableNonControllingInterestsAbstractAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_ShareholdersEquityAndRedeemableNoncontrollingInterestsDisclosureTextBlock" abstract="false" name="ShareholdersEquityAndRedeemableNoncontrollingInterestsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_ScheduleOfFinancialInstrumentsInStatementOfFinancialPositionFairValueTableTextBlock" abstract="false" name="ScheduleOfFinancialInstrumentsInStatementOfFinancialPositionFairValueTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_ScheduleOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsTableTextBlock" abstract="false" name="ScheduleOfCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_SummaryOfCommodityDerivativesTableTextBlock" abstract="false" name="SummaryOfCommodityDerivativesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_SummaryOfInterestRateDerivativesTableTextBlock" abstract="false" name="SummaryOfInterestRateDerivativesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_SummaryOfForeignCurrencyDerivativesTableTextBlock" abstract="false" name="SummaryOfForeignCurrencyDerivativesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lyb_DiscontinuedOperationsLineItems" abstract="true" name="DiscontinuedOperationsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_OlefinsAndCoProductsMember" abstract="true" name="OlefinsAndCoProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PolyethyleneMember" abstract="true" name="PolyethyleneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PolypropyleneMember" abstract="true" name="PolypropyleneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PoAndDerivativesMember" abstract="true" name="PoAndDerivativesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_OxyfuelsAndRelatedProductsMember" abstract="true" name="OxyfuelsAndRelatedProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_IntermediateChemicalsMember" abstract="true" name="IntermediateChemicalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_CompoundingandsolutionsMember" abstract="true" name="CompoundingandsolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_OtherProductsMember" abstract="true" name="OtherProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_NonReportableGeographicalComponentsMember" abstract="true" name="NonReportableGeographicalComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_SeniorNotesDue2055Member" abstract="true" name="SeniorNotesDue2055Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNoteDue2027Member" abstract="true" name="GuaranteedNoteDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2043Member" abstract="true" name="GuaranteedNotesDue2043Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2044Member" abstract="true" name="GuaranteedNotesDue2044Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2026Member" abstract="true" name="GuaranteedNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotes2Due2027Member" abstract="true" name="GuaranteedNotes2Due2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2031Member" abstract="true" name="GuaranteedNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_A3.375GuaranteedNotesDue2030Member" abstract="true" name="A3.375GuaranteedNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_A2.25GuaranteedNotesDue2030Member" abstract="true" name="A2.25GuaranteedNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_A5.125GuaranteedNotesDue2031Member" abstract="true" name="A5.125GuaranteedNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2033Member" abstract="true" name="GuaranteedNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2034Member" abstract="true" name="GuaranteedNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2035Member" abstract="true" name="GuaranteedNotesDue2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2036Member" abstract="true" name="GuaranteedNotesDue2036Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2040Member" abstract="true" name="GuaranteedNotesDue2040Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesdue2049Member" abstract="true" name="GuaranteedNotesdue2049Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2050Member" abstract="true" name="GuaranteedNotesDue2050Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2051Member" abstract="true" name="GuaranteedNotesDue2051Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_GuaranteedNotesDue2060Member" abstract="true" name="GuaranteedNotesDue2060Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_OtherLongTermDebtMember" abstract="true" name="OtherLongTermDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_SubsidiaryIssuerLYBInternationalFinanceBVMember" abstract="true" name="SubsidiaryIssuerLYBInternationalFinanceBVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_SubsidiaryIssuerLYBInternationalIIFinanceBVMember" abstract="true" name="SubsidiaryIssuerLYBInternationalIIFinanceBVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_SubsidiaryIssuerLYBInternationalIIIFinanceLLCMember" abstract="true" name="SubsidiaryIssuerLYBInternationalIIIFinanceLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_A125GuaranteedNotesDue2025Member" abstract="true" name="A125GuaranteedNotesDue2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_U.S.ReceivablesFacilityMember" abstract="true" name="U.S.ReceivablesFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PreciousMetalFinancingsMember" abstract="true" name="PreciousMetalFinancingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_DerivativeAndNonderivativeInstrumentsClassificationAxis" abstract="true" name="DerivativeAndNonderivativeInstrumentsClassificationAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lyb_ClassificationOfFinancialInstrumentsDomain" abstract="true" name="ClassificationOfFinancialInstrumentsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_NonDerivativeMember" abstract="true" name="NonDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_LiabilitiesCarryingValueDisclosure" abstract="false" name="LiabilitiesCarryingValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_EthaneCommodityDerivativeMember" abstract="true" name="EthaneCommodityDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PowerCommodityDerivativeMember" abstract="true" name="PowerCommodityDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_OtherCommoditiesCommodityDerivativeMember" abstract="true" name="OtherCommoditiesCommodityDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_EffectiveIncomeTaxRateReconciliationTaxBenefitTaxRefundClaimPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxBenefitTaxRefundClaimPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lyb_AccruedEnvironmentalLiabilityInLiabilitiesHeldForSaleNotPartOfDisposalGroup" abstract="false" name="AccruedEnvironmentalLiabilityInLiabilitiesHeldForSaleNotPartOfDisposalGroup" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_SiteContingencyAccruedLiabilities" abstract="false" name="SiteContingencyAccruedLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_IndemnificationArrangementPeriod" abstract="false" name="IndemnificationArrangementPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lyb_A2025ShareRepurchaseAuthorizationMember" abstract="true" name="A2025ShareRepurchaseAuthorizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_A2024ShareRepurchaseAuthorizationMember" abstract="true" name="A2024ShareRepurchaseAuthorizationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_IncreaseDecreaseinTreasuryStockRollForward" abstract="true" name="IncreaseDecreaseinTreasuryStockRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_AccumulatedDefinedBenefitPlansAdjustmentCurtailmentGainAttributableToParentMember" abstract="true" name="AccumulatedDefinedBenefitPlansAdjustmentCurtailmentGainAttributableToParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_AccumulatedDefinedBenefitPlansAdjustmentSettlementLossAttributableToParentMember" abstract="true" name="AccumulatedDefinedBenefitPlansAdjustmentSettlementLossAttributableToParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_EarningsPerShareBasicAndDilutedLineItems" abstract="true" name="EarningsPerShareBasicAndDilutedLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_DividendsOnRedeemableNonControllingInterests" abstract="false" name="DividendsOnRedeemableNonControllingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_OlefinsAndPolyolefinsAmericasMember" abstract="true" name="OlefinsAndPolyolefinsAmericasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_OlefinsAndPolyolefinsEuropeAsiaInternationalMember" abstract="true" name="OlefinsAndPolyolefinsEuropeAsiaInternationalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_IntermediatesAndDerivativesMember" abstract="true" name="IntermediatesAndDerivativesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_AdvancedPolymerSolutionsMember" abstract="true" name="AdvancedPolymerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_TechnologyMember" abstract="true" name="TechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_CorporateNonSegmentAndEliminationsMember" abstract="true" name="CorporateNonSegmentAndEliminationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_SegmentMeasureOfProfitabilityEarningsBeforeInterestTaxesDepreciationAndAmortization" abstract="false" name="SegmentMeasureOfProfitabilityEarningsBeforeInterestTaxesDepreciationAndAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_EuropeanAssetsMember" abstract="true" name="EuropeanAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_EuropeanPOJointVentureMember" abstract="true" name="EuropeanPOJointVentureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PolypropyleneUnitMember" abstract="true" name="PolypropyleneUnitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_PlasticWasteSortingFacilityMember" abstract="true" name="PlasticWasteSortingFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lyb_DisposalGroupIncludingDiscontinuedOperationCashContributedPriorToDisposal" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationCashContributedPriorToDisposal" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_ReconciliationOfEBITDAToIncomeFromContinuingOperationsBeforeIncomeTaxesAbstract" abstract="true" name="ReconciliationOfEBITDAToIncomeFromContinuingOperationsBeforeIncomeTaxesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_EarningsBeforeInterestTaxesDepreciationAndAmortizationAbstract" abstract="true" name="EarningsBeforeInterestTaxesDepreciationAndAmortizationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_EarningsBeforeInterestTaxesDepreciationAndAmortizationTotalReportableSegments" abstract="false" name="EarningsBeforeInterestTaxesDepreciationAndAmortizationTotalReportableSegments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_EarningsBeforeInterestTaxesDepreciationAndAmortizationOtherThanFromReportableSegments" abstract="false" name="EarningsBeforeInterestTaxesDepreciationAndAmortizationOtherThanFromReportableSegments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lyb_ReconciliationOfEBITDAToIncomeFromContinuingOperationsBeforeIncomeTaxesSubtractedAmountsAbstract" abstract="true" name="ReconciliationOfEBITDAToIncomeFromContinuingOperationsBeforeIncomeTaxesSubtractedAmountsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lyb_ReconciliationOfEBITDAToIncomeFromContinuingOperationsBeforeIncomeTaxesAddedAmountsAbstract" abstract="true" name="ReconciliationOfEBITDAToIncomeFromContinuingOperationsBeforeIncomeTaxesAddedAmountsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
</xs:schema>
