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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2017 Workiva-->
<!--r:2e7fc130-5b3e-4146-802d-a8cc5300b77a,g:30f5dd19-cecd-4987-bee9-b771f1d6cc02-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:band="http://www.bandwidth.com/20180930" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:link="http://www.xbrl.org/2003/linkbase" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.bandwidth.com/20180930">
  <xs:import namespace="http://fasb.org/srt/2018-01-31" schemaLocation="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2018-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.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/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.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/2017-01-31" schemaLocation="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2018-01-31" schemaLocation="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd"/>
  <xs:element id="band_StockPurchaseWarrantsIssuedandOutstandingMember" abstract="true" name="StockPurchaseWarrantsIssuedandOutstandingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_AnnualCompensationForService" abstract="false" name="AnnualCompensationForService" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_DomainNameandRelatedTrademarksDomain" abstract="true" name="DomainNameandRelatedTrademarksDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_TransitionServicesAgreementMember" abstract="true" name="TransitionServicesAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_AllowanceforDoubtfulAccountsReceivableWriteoffsRelatedtoSettlements" abstract="false" name="AllowanceforDoubtfulAccountsReceivableWriteoffsRelatedtoSettlements" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_CommonStockCapitalSharesReservedforFutureIssuancePercentIncrease" abstract="false" name="CommonStockCapitalSharesReservedforFutureIssuancePercentIncrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="band_BoardOfDirectorsMemberMember" abstract="true" name="BoardOfDirectorsMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_ScheduleOfAccruedExpenseAndOtherCurrentLiabilitiesTableTextBlock" abstract="false" name="ScheduleOfAccruedExpenseAndOtherCurrentLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="band_FinancialAssetsMember" abstract="true" name="FinancialAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_AuditCommitteeMemberMember" abstract="true" name="AuditCommitteeMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_FinancialAssetsGrossUnrealizedLoss" abstract="false" name="FinancialAssetsGrossUnrealizedLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_FinancialAssetsExcludingMarketableSecuritiesMember" abstract="true" name="FinancialAssetsExcludingMarketableSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_USReverseRepurchaseAgreementsMember" abstract="true" name="USReverseRepurchaseAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_DepreciationExpenseLineItems" abstract="true" name="DepreciationExpenseLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="band_A2010EquityCompensationPlanMember" abstract="true" name="A2010EquityCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_ReverseRepurchaseAgreementsCollateralizedByDepositsInFormOfGovernmentSecuritiesAndObligationsAsPercentageOfValues" abstract="false" name="ReverseRepurchaseAgreementsCollateralizedByDepositsInFormOfGovernmentSecuritiesAndObligationsAsPercentageOfValues" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="band_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsFairValueRange" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsFairValueRange" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="band_RepublicMember" abstract="true" name="RepublicMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_ComputerandOfficeEquipmentMember" abstract="true" name="ComputerandOfficeEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_DepreciationandAmortizationNetofAmortizationofDebtIssuanceCosts" abstract="false" name="DepreciationandAmortizationNetofAmortizationofDebtIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_DepreciationExpenseTable" abstract="true" name="DepreciationExpenseTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="band_BillingsDeemedNotProbableOfCollectionAndChargedToContraRevenueAccount" abstract="false" name="BillingsDeemedNotProbableOfCollectionAndChargedToContraRevenueAccount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_CompensationCommitteeMemberMember" abstract="true" name="CompensationCommitteeMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_StockOptionsIssuedandOutstandingMember" abstract="true" name="StockOptionsIssuedandOutstandingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_FinancialAssetsGrossUnrealizedGain" abstract="false" name="FinancialAssetsGrossUnrealizedGain" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_CommonStockVotingRightsVotesPerShare" abstract="false" name="CommonStockVotingRightsVotesPerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="band_AccountsReceivableExcludingCarrierAccessBillingCABMember" abstract="true" name="AccountsReceivableExcludingCarrierAccessBillingCABMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_OtherCommitmentTermofAgreement" abstract="false" name="OtherCommitmentTermofAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="band_FacilitiesSharingAgreementMember" abstract="true" name="FacilitiesSharingAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_A2017EquityCompensationPlanMember" abstract="true" name="A2017EquityCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_OtherCommitmentsFutureMinimumAnnualPayments" abstract="false" name="OtherCommitmentsFutureMinimumAnnualPayments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_CPaaSMember" abstract="true" name="CPaaSMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_TelecommunicationsEquipmentMember" abstract="true" name="TelecommunicationsEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_RaleighNCMember" abstract="true" name="RaleighNCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_TaxSharingAgreementMember" abstract="true" name="TaxSharingAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_FinancialStatementComponentsAbstract" abstract="true" name="FinancialStatementComponentsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="band_AccretionOfBondDiscount" abstract="false" name="AccretionOfBondDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_CashandCashEquivalentsGrossUnrealizedGain" abstract="false" name="CashandCashEquivalentsGrossUnrealizedGain" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_MasterServicesAgreementMember" abstract="true" name="MasterServicesAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_ScheduleOfDepreciationExpenseTableTextBlock" abstract="false" name="ScheduleOfDepreciationExpenseTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="band_DocumentandEntityInformationAbstract" abstract="true" name="DocumentandEntityInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="band_CashandCashEquivalentsGrossUnrealizedLoss" abstract="false" name="CashandCashEquivalentsGrossUnrealizedLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="band_CarrierAccessBillingMember" abstract="true" name="CarrierAccessBillingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="band_CustomerOneMember" abstract="true" name="CustomerOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <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="band-20180930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" 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="band-20180930_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="band-20180930_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="band-20180930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="DocumentandEntityInformation" roleURI="http://www.bandwidth.com/role/DocumentandEntityInformation">
        <link:definition>0001001 - Document - Document and Entity 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="CondensedConsolidatedBalanceSheets" roleURI="http://www.bandwidth.com/role/CondensedConsolidatedBalanceSheets">
        <link:definition>1001002 - Statement - Condensed 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="CondensedConsolidatedStatementsofOperationsandComprehensiveIncome" roleURI="http://www.bandwidth.com/role/CondensedConsolidatedStatementsofOperationsandComprehensiveIncome">
        <link:definition>1002003 - Statement - Condensed Consolidated Statements of Operations and 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="CondensedConsolidatedStatementsofCashFlows" roleURI="http://www.bandwidth.com/role/CondensedConsolidatedStatementsofCashFlows">
        <link:definition>1003004 - Statement - Condensed 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="OrganizationandDescriptionofBusiness" roleURI="http://www.bandwidth.com/role/OrganizationandDescriptionofBusiness">
        <link:definition>2101101 - Disclosure - Organization and Description of Business</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="OrganizationandDescriptionofBusinessDetails" roleURI="http://www.bandwidth.com/role/OrganizationandDescriptionofBusinessDetails">
        <link:definition>2402401 - Disclosure - Organization and Description of Business (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="SummaryofSignificantAccountingPolicies" roleURI="http://www.bandwidth.com/role/SummaryofSignificantAccountingPolicies">
        <link:definition>2103102 - Disclosure - Summary of Significant Accounting 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="SummaryofSignificantAccountingPoliciesPolicies" roleURI="http://www.bandwidth.com/role/SummaryofSignificantAccountingPoliciesPolicies">
        <link:definition>2204201 - Disclosure - Summary of Significant Accounting Policies (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="SummaryofSignificantAccountingPoliciesTables" roleURI="http://www.bandwidth.com/role/SummaryofSignificantAccountingPoliciesTables">
        <link:definition>2305301 - Disclosure - Summary of Significant Accounting Policies (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="SummaryofSignificantAccountingPoliciesReconciliationofCashCashEquivalentsandRestrictedCashDetails" roleURI="http://www.bandwidth.com/role/SummaryofSignificantAccountingPoliciesReconciliationofCashCashEquivalentsandRestrictedCashDetails">
        <link:definition>2406402 - Disclosure - Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (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="SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails">
        <link:definition>2407403 - Disclosure - Summary of Significant Accounting Policies - Additional 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="FairValueofFinancialInstruments" roleURI="http://www.bandwidth.com/role/FairValueofFinancialInstruments">
        <link:definition>2108103 - Disclosure - Fair Value of Financial Instruments</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="FairValueofFinancialInstrumentsTables" roleURI="http://www.bandwidth.com/role/FairValueofFinancialInstrumentsTables">
        <link:definition>2309302 - Disclosure - Fair Value of Financial Instruments (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="FairValueofFinancialInstrumentsAssetsMeasuredatFairValueDetails" roleURI="http://www.bandwidth.com/role/FairValueofFinancialInstrumentsAssetsMeasuredatFairValueDetails">
        <link:definition>2410404 - Disclosure - Fair Value of Financial Instruments - Assets Measured at Fair Value (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="FairValueofFinancialInstrumentsContractualMaturitiesofMarketableSecuritiesDetails" roleURI="http://www.bandwidth.com/role/FairValueofFinancialInstrumentsContractualMaturitiesofMarketableSecuritiesDetails">
        <link:definition>2411405 - Disclosure - Fair Value of Financial Instruments - Contractual Maturities of Marketable Securities (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="FinancialStatementComponents" roleURI="http://www.bandwidth.com/role/FinancialStatementComponents">
        <link:definition>2112104 - Disclosure - Financial Statement Components</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="FinancialStatementComponentsTables" roleURI="http://www.bandwidth.com/role/FinancialStatementComponentsTables">
        <link:definition>2313303 - Disclosure - Financial Statement Components (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="FinancialStatementComponentsAccountsReceivableNetofAllowanceforDoubtfulAccountsDetails" roleURI="http://www.bandwidth.com/role/FinancialStatementComponentsAccountsReceivableNetofAllowanceforDoubtfulAccountsDetails">
        <link:definition>2414406 - Disclosure - Financial Statement Components - Accounts Receivable, Net of Allowance for Doubtful Accounts (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="FinancialStatementComponentsAllowanceForDoubtfulAccountsDetails" roleURI="http://www.bandwidth.com/role/FinancialStatementComponentsAllowanceForDoubtfulAccountsDetails">
        <link:definition>2415407 - Disclosure - Financial Statement Components - Allowance For Doubtful Accounts (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="FinancialStatementComponentsAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/FinancialStatementComponentsAdditionalInformationDetails">
        <link:definition>2416408 - Disclosure - Financial Statement Components - Additional 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="FinancialStatementComponentsAccruedExpensesandOtherCurrentLiabilitiesDetails" roleURI="http://www.bandwidth.com/role/FinancialStatementComponentsAccruedExpensesandOtherCurrentLiabilitiesDetails">
        <link:definition>2417409 - Disclosure - Financial Statement Components - Accrued Expenses and Other Current Liabilities (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="PropertyandEquipment" roleURI="http://www.bandwidth.com/role/PropertyandEquipment">
        <link:definition>2118105 - Disclosure - Property and Equipment</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="PropertyandEquipmentTables" roleURI="http://www.bandwidth.com/role/PropertyandEquipmentTables">
        <link:definition>2319304 - Disclosure - Property and Equipment (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="PropertyandEquipmentSummaryofPropertyandEquipmentNetDetails" roleURI="http://www.bandwidth.com/role/PropertyandEquipmentSummaryofPropertyandEquipmentNetDetails">
        <link:definition>2420410 - Disclosure - Property and Equipment - Summary of Property and Equipment, Net (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="PropertyandEquipmentAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/PropertyandEquipmentAdditionalInformationDetails">
        <link:definition>2421411 - Disclosure - Property and Equipment - Additional 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="PropertyandEquipmentDepreciationExpenseDetails" roleURI="http://www.bandwidth.com/role/PropertyandEquipmentDepreciationExpenseDetails">
        <link:definition>2422412 - Disclosure - Property and Equipment - Depreciation Expense (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="IntangibleAssets" roleURI="http://www.bandwidth.com/role/IntangibleAssets">
        <link:definition>2123106 - Disclosure - Intangible Assets</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="IntangibleAssetsTables" roleURI="http://www.bandwidth.com/role/IntangibleAssetsTables">
        <link:definition>2324305 - Disclosure - Intangible Assets (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="IntangibleAssetsSummaryofIntangibleAssetsDetails" roleURI="http://www.bandwidth.com/role/IntangibleAssetsSummaryofIntangibleAssetsDetails">
        <link:definition>2425413 - Disclosure - Intangible Assets - Summary of Intangible Assets (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="IntangibleAssetsAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/IntangibleAssetsAdditionalInformationDetails">
        <link:definition>2426414 - Disclosure - Intangible Assets - Additional 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="IntangibleAssetsFutureEstimatedAmortizationExpenseDetails" roleURI="http://www.bandwidth.com/role/IntangibleAssetsFutureEstimatedAmortizationExpenseDetails">
        <link:definition>2427415 - Disclosure - Intangible Assets - Future Estimated Amortization Expense (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="Debt" roleURI="http://www.bandwidth.com/role/Debt">
        <link:definition>2128107 - 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="DebtTables" roleURI="http://www.bandwidth.com/role/DebtTables">
        <link:definition>2329306 - 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="DebtAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/DebtAdditionalInformationDetails">
        <link:definition>2430416 - Disclosure - Debt - Additional 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="DebtRemainingPaymentsdueonCapitalLeaseObligationsDetails" roleURI="http://www.bandwidth.com/role/DebtRemainingPaymentsdueonCapitalLeaseObligationsDetails">
        <link:definition>2431417 - Disclosure - Debt - Remaining Payments due on Capital Lease Obligations (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="DebtRemainingPaymentsdueonCapitalLeaseObligationsDetails_1" roleURI="http://www.bandwidth.com/role/DebtRemainingPaymentsdueonCapitalLeaseObligationsDetails_1">
        <link:definition>2431417 - Disclosure - Debt - Remaining Payments due on Capital Lease Obligations (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="SegmentandGeographicInformation" roleURI="http://www.bandwidth.com/role/SegmentandGeographicInformation">
        <link:definition>2132108 - Disclosure - Segment and Geographic 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="SegmentandGeographicInformationTables" roleURI="http://www.bandwidth.com/role/SegmentandGeographicInformationTables">
        <link:definition>2333307 - Disclosure - Segment and Geographic 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="SegmentandGeographicInformationReconciliationofSegmentProfitLossDetails" roleURI="http://www.bandwidth.com/role/SegmentandGeographicInformationReconciliationofSegmentProfitLossDetails">
        <link:definition>2434418 - Disclosure - Segment and Geographic Information - Reconciliation of Segment Profit (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="SegmentandGeographicInformationReconciliationofRevenuebyGeographicAreaDetails" roleURI="http://www.bandwidth.com/role/SegmentandGeographicInformationReconciliationofRevenuebyGeographicAreaDetails">
        <link:definition>2435419 - Disclosure - Segment and Geographic Information - Reconciliation of Revenue by Geographic Area (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="StockholdersEquity" roleURI="http://www.bandwidth.com/role/StockholdersEquity">
        <link:definition>2136109 - Disclosure - Stockholders' 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="StockholdersEquityTables" roleURI="http://www.bandwidth.com/role/StockholdersEquityTables">
        <link:definition>2337308 - Disclosure - Stockholders' Equity (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="StockholdersEquityAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/StockholdersEquityAdditionalInformationDetails">
        <link:definition>2438420 - Disclosure - Stockholders' Equity - Additional 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="StockholdersEquityReservedSharesofCommonStockforIssuanceDetails" roleURI="http://www.bandwidth.com/role/StockholdersEquityReservedSharesofCommonStockforIssuanceDetails">
        <link:definition>2439421 - Disclosure - Stockholders' Equity - Reserved Shares of Common Stock for Issuance (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="StockBasedCompensation" roleURI="http://www.bandwidth.com/role/StockBasedCompensation">
        <link:definition>2140110 - Disclosure - Stock Based Compensation</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="StockBasedCompensationTables" roleURI="http://www.bandwidth.com/role/StockBasedCompensationTables">
        <link:definition>2341309 - Disclosure - Stock Based Compensation (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="StockBasedCompensationAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/StockBasedCompensationAdditionalInformationDetails">
        <link:definition>2442422 - Disclosure - Stock Based Compensation - Additional 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="StockBasedCompensationFairValueofOptionsGrantedUsingtheBlackScholesPricingModelDetails" roleURI="http://www.bandwidth.com/role/StockBasedCompensationFairValueofOptionsGrantedUsingtheBlackScholesPricingModelDetails">
        <link:definition>2443423 - Disclosure - Stock Based Compensation - Fair Value of Options Granted Using the Black-Scholes Pricing Model (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="StockBasedCompensationStockOptionActivityDetails" roleURI="http://www.bandwidth.com/role/StockBasedCompensationStockOptionActivityDetails">
        <link:definition>2444424 - Disclosure - Stock Based Compensation - Stock Option Activity (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="StockBasedCompensationRestrictedStockUnitActivityDetails" roleURI="http://www.bandwidth.com/role/StockBasedCompensationRestrictedStockUnitActivityDetails">
        <link:definition>2445425 - Disclosure - Stock Based Compensation - Restricted Stock Unit Activity (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="StockBasedCompensationStockBasedCompensationExpenseDetails" roleURI="http://www.bandwidth.com/role/StockBasedCompensationStockBasedCompensationExpenseDetails">
        <link:definition>2446426 - Disclosure - Stock Based Compensation - Stock Based Compensation Expense (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="CommitmentsandContingencies" roleURI="http://www.bandwidth.com/role/CommitmentsandContingencies">
        <link:definition>2147111 - 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="CommitmentsandContingenciesTables" roleURI="http://www.bandwidth.com/role/CommitmentsandContingenciesTables">
        <link:definition>2348310 - Disclosure - Commitments and Contingencies (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="CommitmentsandContingenciesAdditionalInformationDetails" roleURI="http://www.bandwidth.com/role/CommitmentsandContingenciesAdditionalInformationDetails">
        <link:definition>2449427 - Disclosure - Commitments and Contingencies - Additional 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="CommitmentsandContingenciesFutureMinimumRentalPaymentsforOperatingLeasesDetails" roleURI="http://www.bandwidth.com/role/CommitmentsandContingenciesFutureMinimumRentalPaymentsforOperatingLeasesDetails">
        <link:definition>2450428 - Disclosure - Commitments and Contingencies - Future Minimum Rental Payments for Operating Leases (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="CommitmentsandContingenciesFutureMinimumLeaseReceiptsDetails" roleURI="http://www.bandwidth.com/role/CommitmentsandContingenciesFutureMinimumLeaseReceiptsDetails">
        <link:definition>2451429 - Disclosure - Commitments and Contingencies - Future Minimum Lease Receipts (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="EmployeeBenefitPlan" roleURI="http://www.bandwidth.com/role/EmployeeBenefitPlan">
        <link:definition>2152112 - Disclosure - Employee Benefit Plan</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="EmployeeBenefitPlanDetails" roleURI="http://www.bandwidth.com/role/EmployeeBenefitPlanDetails">
        <link:definition>2453430 - Disclosure - Employee Benefit Plan (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="IncomeTaxes" roleURI="http://www.bandwidth.com/role/IncomeTaxes">
        <link:definition>2154113 - 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="IncomeTaxesDetails" roleURI="http://www.bandwidth.com/role/IncomeTaxesDetails">
        <link:definition>2455431 - Disclosure - 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>
      <link:roleType id="RelatedParties" roleURI="http://www.bandwidth.com/role/RelatedParties">
        <link:definition>2156114 - Disclosure - Related Parties</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="RelatedPartiesDetails" roleURI="http://www.bandwidth.com/role/RelatedPartiesDetails">
        <link:definition>2457432 - Disclosure - Related Parties (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="BasicandDilutedIncomeperCommonShare" roleURI="http://www.bandwidth.com/role/BasicandDilutedIncomeperCommonShare">
        <link:definition>2158115 - Disclosure - Basic and Diluted Income per Common Share</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="BasicandDilutedIncomeperCommonShareTables" roleURI="http://www.bandwidth.com/role/BasicandDilutedIncomeperCommonShareTables">
        <link:definition>2359311 - Disclosure - Basic and Diluted Income per Common Share (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="BasicandDilutedIncomeperCommonShareComponentsofBasicandDilutedEarningsperShareDetails" roleURI="http://www.bandwidth.com/role/BasicandDilutedIncomeperCommonShareComponentsofBasicandDilutedEarningsperShareDetails">
        <link:definition>2460433 - Disclosure - Basic and Diluted Income per Common Share - Components of Basic and Diluted Earnings per Share (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="BasicandDilutedIncomeperCommonShareAntidilutiveSecuritiesExcludedfromtheComputationDetails" roleURI="http://www.bandwidth.com/role/BasicandDilutedIncomeperCommonShareAntidilutiveSecuritiesExcludedfromtheComputationDetails">
        <link:definition>2461434 - Disclosure - Basic and Diluted Income per Common Share - Antidilutive Securities Excluded from the Computation (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="SubsequentEvents" roleURI="http://www.bandwidth.com/role/SubsequentEvents">
        <link:definition>2162116 - Disclosure - Subsequent Events</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="SubsequentEventsDetails" roleURI="http://www.bandwidth.com/role/SubsequentEventsDetails">
        <link:definition>2463435 - Disclosure - Subsequent Events (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:schema>
