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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:32c268fc-8fc3-424b-9976-130c4535eea9,g:eea5cc17-4b82-47b0-994e-e1fee8a9b407-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:blkb="http://www.blackbaud.com/20200930" 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" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.blackbaud.com/20200930">
  <xs:import namespace="http://fasb.org/srt/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2020-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.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.sec.gov/country/2020-01-31" schemaLocation="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.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="blkb-20200930_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="blkb-20200930_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="blkb-20200930_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="blkb-20200930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Document" roleURI="http://www.blackbaud.com/role/Document">
        <link:definition>0001001 - Document - Document</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.blackbaud.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="CondensedConsolidatedBalanceSheetsParenthetical" roleURI="http://www.blackbaud.com/role/CondensedConsolidatedBalanceSheetsParenthetical">
        <link:definition>1002003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</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="CondensedConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofComprehensiveIncome">
        <link:definition>1003004 - Statement - Condensed 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="CondensedConsolidatedStatementsofCashFlows" roleURI="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofCashFlows">
        <link:definition>1004005 - 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="CondensedConsolidatedStatementsofStockholdersEquity" roleURI="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofStockholdersEquity">
        <link:definition>1005006 - Statement - Condensed Consolidated Statements of 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="CondensedConsolidatedStatementsofStockholdersEquityParenthetical" roleURI="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofStockholdersEquityParenthetical">
        <link:definition>1006007 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)</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="Organization" roleURI="http://www.blackbaud.com/role/Organization">
        <link:definition>2101101 - Disclosure - Organization</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.blackbaud.com/role/BasisofPresentation">
        <link:definition>2102102 - 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="BasisofPresentationPolicy" roleURI="http://www.blackbaud.com/role/BasisofPresentationPolicy">
        <link:definition>2203201 - Disclosure - Basis of Presentation (Policy)</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="BasisofPresentationBasisofPresentationTables" roleURI="http://www.blackbaud.com/role/BasisofPresentationBasisofPresentationTables">
        <link:definition>2304301 - Disclosure - Basis of Presentation Basis of Presentation (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="BasisofPresentationDetails" roleURI="http://www.blackbaud.com/role/BasisofPresentationDetails">
        <link:definition>2405401 - Disclosure - Basis of Presentation (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="BasisofPresentationBasisofPresentationChangesinAllowanceforCreditLossesandSalesReturnsDetails" roleURI="http://www.blackbaud.com/role/BasisofPresentationBasisofPresentationChangesinAllowanceforCreditLossesandSalesReturnsDetails">
        <link:definition>2406402 - Disclosure - Basis of Presentation Basis of Presentation (Changes in Allowance for Credit Losses and Sales Returns) (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="GoodwillandOtherIntangibleAssets" roleURI="http://www.blackbaud.com/role/GoodwillandOtherIntangibleAssets">
        <link:definition>2107103 - Disclosure - Goodwill and Other 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="GoodwillandOtherIntangibleAssetsTables" roleURI="http://www.blackbaud.com/role/GoodwillandOtherIntangibleAssetsTables">
        <link:definition>2308302 - Disclosure - Goodwill and Other 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="GoodwillandOtherIntangibleAssetsChangeinGoodwillDetails" roleURI="http://www.blackbaud.com/role/GoodwillandOtherIntangibleAssetsChangeinGoodwillDetails">
        <link:definition>2409403 - Disclosure - Goodwill and Other Intangible Assets (Change in Goodwill) (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="EarningsPerShare" roleURI="http://www.blackbaud.com/role/EarningsPerShare">
        <link:definition>2110104 - Disclosure - Earnings Per 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="EarningsPerShareTables" roleURI="http://www.blackbaud.com/role/EarningsPerShareTables">
        <link:definition>2311303 - Disclosure - Earnings Per 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="EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails" roleURI="http://www.blackbaud.com/role/EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails">
        <link:definition>2412404 - Disclosure - Earnings Per Share (Computation 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="FairValueMeasurements" roleURI="http://www.blackbaud.com/role/FairValueMeasurements">
        <link:definition>2113105 - Disclosure - 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="FairValueMeasurementsTables" roleURI="http://www.blackbaud.com/role/FairValueMeasurementsTables">
        <link:definition>2314304 - Disclosure - 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="FairValueMeasurementsFairValueMeasurementsDetails" roleURI="http://www.blackbaud.com/role/FairValueMeasurementsFairValueMeasurementsDetails">
        <link:definition>2415405 - Disclosure - Fair Value Measurements Fair Value Measurements (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="FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" roleURI="http://www.blackbaud.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails">
        <link:definition>2416406 - Disclosure - Fair Value Measurements (Assets and Liabilities 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="PropertyandEquipment" roleURI="http://www.blackbaud.com/role/PropertyandEquipment">
        <link:definition>2117106 - 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="PropertyPlantandEquipmentTables" roleURI="http://www.blackbaud.com/role/PropertyPlantandEquipmentTables">
        <link:definition>2318305 - Disclosure - Property, Plant, 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="PropertyandEquipmentDetails" roleURI="http://www.blackbaud.com/role/PropertyandEquipmentDetails">
        <link:definition>2419407 - Disclosure - Property and Equipment (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="PropertyandEquipmentScheduleofPropertyandEquipmentDetails" roleURI="http://www.blackbaud.com/role/PropertyandEquipmentScheduleofPropertyandEquipmentDetails">
        <link:definition>2420408 - Disclosure - Property and Equipment (Schedule of Property and Equipment) (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="ConsolidatedFinancialStatementDetails" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetails">
        <link:definition>2121107 - Disclosure - Consolidated Financial Statement 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="ConsolidatedFinancialStatementDetailsTables" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsTables">
        <link:definition>2322306 - Disclosure - Consolidated Financial Statement Details (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="ConsolidatedFinancialStatementDetailsComponentsofRestrictedCashDetails" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsComponentsofRestrictedCashDetails">
        <link:definition>2423409 - Disclosure - Consolidated Financial Statement Details (Components of 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="ConsolidatedFinancialStatementDetailsComponentsofPrepaidExpensesandOtherAssetsDetails" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsComponentsofPrepaidExpensesandOtherAssetsDetails">
        <link:definition>2424410 - Disclosure - Consolidated Financial Statement Details (Components of Prepaid Expenses and Other 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="ConsolidatedFinancialStatementDetailsComponentsofPrepaidExpensesandOtherAssetsDetails_1" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsComponentsofPrepaidExpensesandOtherAssetsDetails_1">
        <link:definition>2424410 - Disclosure - Consolidated Financial Statement Details (Components of Prepaid Expenses and Other 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="ConsolidatedFinancialStatementDetailsComponentsofAccruedExpensesandOtherLiabilitiesDetails" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsComponentsofAccruedExpensesandOtherLiabilitiesDetails">
        <link:definition>2425411 - Disclosure - Consolidated Financial Statement Details (Components of Accrued Expenses and Other 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="ConsolidatedFinancialStatementDetailsComponentsofAccruedExpensesandOtherLiabilitiesDetails_1" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsComponentsofAccruedExpensesandOtherLiabilitiesDetails_1">
        <link:definition>2425411 - Disclosure - Consolidated Financial Statement Details (Components of Accrued Expenses and Other 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="ConsolidatedFinancialStatementDetailsComponentsofOtherIncomeandExpenseDetails" roleURI="http://www.blackbaud.com/role/ConsolidatedFinancialStatementDetailsComponentsofOtherIncomeandExpenseDetails">
        <link:definition>2426412 - Disclosure - Consolidated Financial Statement Details (Components of Other Income and 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.blackbaud.com/role/Debt">
        <link:definition>2127108 - 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.blackbaud.com/role/DebtTables">
        <link:definition>2328307 - 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="DebtDetails" roleURI="http://www.blackbaud.com/role/DebtDetails">
        <link:definition>2429413 - Disclosure - 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="DebtSummaryofDebtDetails" roleURI="http://www.blackbaud.com/role/DebtSummaryofDebtDetails">
        <link:definition>2430414 - Disclosure - Debt (Summary of 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="DebtAnnualMaturitiesRelatedtoCreditFacilityDetails" roleURI="http://www.blackbaud.com/role/DebtAnnualMaturitiesRelatedtoCreditFacilityDetails">
        <link:definition>2431415 - Disclosure - Debt (Annual Maturities Related to Credit Facility) (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="DerivativeInstruments" roleURI="http://www.blackbaud.com/role/DerivativeInstruments">
        <link:definition>2132109 - Disclosure - Derivative 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="DerivativeInstrumentsTables" roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsTables">
        <link:definition>2333308 - Disclosure - Derivative 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="DerivativeInstrumentsDetails" roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsDetails">
        <link:definition>2434416 - Disclosure - Derivative 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="DerivativeInstrumentsDerivativeInstrumentsScheduleofInterestRateSwapsDetails" roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsDerivativeInstrumentsScheduleofInterestRateSwapsDetails">
        <link:definition>2435417 - Disclosure - Derivative Instruments Derivative Instruments (Schedule of Interest Rate Swaps) (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="DerivativeInstrumentsFairValueofDerivativeInstrumentsDetails" roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsFairValueofDerivativeInstrumentsDetails">
        <link:definition>2436418 - Disclosure - Derivative Instruments (Fair Value of Derivative 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="DerivativeInstrumentsEffectsofDerivativeInstrumentsinCashFlowHedgingRelationshipsDetails" roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsEffectsofDerivativeInstrumentsinCashFlowHedgingRelationshipsDetails">
        <link:definition>2437419 - Disclosure - Derivative Instruments (Effects of Derivative Instruments in Cash Flow Hedging Relationships) (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.blackbaud.com/role/CommitmentsandContingencies">
        <link:definition>2138110 - 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.blackbaud.com/role/CommitmentsandContingenciesTables">
        <link:definition>2339309 - 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="CommitmentsandContingenciesDetails" roleURI="http://www.blackbaud.com/role/CommitmentsandContingenciesDetails">
        <link:definition>2440420 - Disclosure - Commitments and Contingencies (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="CommitmentsandContingenciesComponentsofLeaseExpenseDetails" roleURI="http://www.blackbaud.com/role/CommitmentsandContingenciesComponentsofLeaseExpenseDetails">
        <link:definition>2441421 - Disclosure - Commitments and Contingencies (Components of Lease 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="CommitmentsandContingenciesScheduleofMaturitiesofOperatingLeaseLiabilitiesDetails" roleURI="http://www.blackbaud.com/role/CommitmentsandContingenciesScheduleofMaturitiesofOperatingLeaseLiabilitiesDetails">
        <link:definition>2442422 - Disclosure - Commitments and Contingencies (Schedule of Maturities of Operating Lease 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="IncomeTaxes" roleURI="http://www.blackbaud.com/role/IncomeTaxes">
        <link:definition>2143111 - 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="IncomeTaxesTables" roleURI="http://www.blackbaud.com/role/IncomeTaxesTables">
        <link:definition>2344310 - Disclosure - Income Taxes (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="IncomeTaxesScheduleofEffectiveIncomeTaxRatesDetails" roleURI="http://www.blackbaud.com/role/IncomeTaxesScheduleofEffectiveIncomeTaxRatesDetails">
        <link:definition>2445423 - Disclosure - Income Taxes (Schedule of Effective Income Tax Rates) (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.blackbaud.com/role/StockBasedCompensation">
        <link:definition>2146112 - 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.blackbaud.com/role/StockBasedCompensationTables">
        <link:definition>2347311 - 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="StockBasedCompensationSummaryofStockBasedCompensationExpenseDetails" roleURI="http://www.blackbaud.com/role/StockBasedCompensationSummaryofStockBasedCompensationExpenseDetails">
        <link:definition>2448424 - Disclosure - Stock-Based Compensation (Summary of 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="StockholdersEquity" roleURI="http://www.blackbaud.com/role/StockholdersEquity">
        <link:definition>2149113 - 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.blackbaud.com/role/StockholdersEquityTables">
        <link:definition>2350312 - 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="StockholdersEquityDetails" roleURI="http://www.blackbaud.com/role/StockholdersEquityDetails">
        <link:definition>2451425 - Disclosure - Stockholders' Equity (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="StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails" roleURI="http://www.blackbaud.com/role/StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails">
        <link:definition>1407426 - Statement - Stockholders' Equity (Changes in Accumulated Other Comprehensive Loss by Component) (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="RevenueRecognition" roleURI="http://www.blackbaud.com/role/RevenueRecognition">
        <link:definition>2152114 - Disclosure - Revenue Recognition</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="RevenueRecognitionTables" roleURI="http://www.blackbaud.com/role/RevenueRecognitionTables">
        <link:definition>2353313 - Disclosure - Revenue Recognition (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="RevenueRecognitionDetails" roleURI="http://www.blackbaud.com/role/RevenueRecognitionDetails">
        <link:definition>2454427 - Disclosure - Revenue Recognition (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="RevenueRecognitionDetails_1" roleURI="http://www.blackbaud.com/role/RevenueRecognitionDetails_1">
        <link:definition>2454427 - Disclosure - Revenue Recognition (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="RevenueRecognitionContractBalancesDetails" roleURI="http://www.blackbaud.com/role/RevenueRecognitionContractBalancesDetails">
        <link:definition>2455428 - Disclosure - Revenue Recognition (Contract Balances) (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="RevenueRecognitionDisaggregationofRevenuebyGeographyDetails" roleURI="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRevenuebyGeographyDetails">
        <link:definition>2456429 - Disclosure - Revenue Recognition (Disaggregation of Revenue by Geography) (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="RevenueRecognitionDisaggregationofRevenuebyMarketGroupDetails" roleURI="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRevenuebyMarketGroupDetails">
        <link:definition>2457430 - Disclosure - Revenue Recognition (Disaggregation of Revenue by Market Group) (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="Restructuring" roleURI="http://www.blackbaud.com/role/Restructuring">
        <link:definition>2158115 - Disclosure - Restructuring</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="RestructuringDetails" roleURI="http://www.blackbaud.com/role/RestructuringDetails">
        <link:definition>2459431 - Disclosure - Restructuring (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.blackbaud.com/role/SubsequentEvents">
        <link:definition>2160116 - 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.blackbaud.com/role/SubsequentEventsDetails">
        <link:definition>2461432 - 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:element id="blkb_SecurityIncidentExpense" abstract="false" name="SecurityIncidentExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_DueToCustomersCurrent" abstract="false" name="DueToCustomersCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_OtherComprehensiveIncomeLossNetOfTaxAttributableToParentBeforeReclassifications" abstract="false" name="OtherComprehensiveIncomeLossNetOfTaxAttributableToParentBeforeReclassifications" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLossToEarnings" abstract="false" name="AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLossToEarnings" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_TaxesPrepaidAndReceivableCurrentAndLongTerm" abstract="false" name="TaxesPrepaidAndReceivableCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_InternationalMarketsGroupMember" abstract="true" name="InternationalMarketsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_AccruedCustomerCreditBalancesCurrentAndLongTerm" abstract="false" name="AccruedCustomerCreditBalancesCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_IncreaseDecreaseAccruedExpensesAndOtherLiabilities" abstract="false" name="IncreaseDecreaseAccruedExpensesAndOtherLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_NetLeverageRatio" abstract="false" name="NetLeverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="blkb_PrepaidSoftwareMaintenanceCurrentAndLongTerm" abstract="false" name="PrepaidSoftwareMaintenanceCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentNumberOfCustomerClaims" abstract="false" name="SecurityIncidentNumberOfCustomerClaims" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="blkb_SecurityIncidentAccruedInsuranceRecoveries" abstract="false" name="SecurityIncidentAccruedInsuranceRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AccumulatedOtherComprehensiveIncomeRollForward" abstract="true" name="AccumulatedOtherComprehensiveIncomeRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_AccruedExpensesAndOtherLiabilitiesTextBlock" abstract="false" name="AccruedExpensesAndOtherLiabilitiesTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="blkb_July2017SwapMember" abstract="true" name="July2017SwapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_AllowanceforReturnsMember" abstract="true" name="AllowanceforReturnsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_OperatingLeaseLeaseNotYetCommencedExpense" abstract="false" name="OperatingLeaseLeaseNotYetCommencedExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_BaseSalaryRequirementforOneTimeBonus" abstract="false" name="BaseSalaryRequirementforOneTimeBonus" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_RecurringMember" abstract="true" name="RecurringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_February2018SwapMember" abstract="true" name="February2018SwapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_AccruedexpensesandothercurrentliabilitiesMember" abstract="true" name="AccruedexpensesandothercurrentliabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_PRSUMember" abstract="true" name="PRSUMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_Blkb_BuildingSystemsMemberMember" abstract="true" name="Blkb_BuildingSystemsMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_SecurityIncidentNumberOfStateAttorneysGeneral" abstract="false" name="SecurityIncidentNumberOfStateAttorneysGeneral" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="blkb_UnrecognizedTaxBenefitCurrentandLongterm" abstract="false" name="UnrecognizedTaxBenefitCurrentandLongterm" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentNumberOfConsumerClassActionCases" abstract="false" name="SecurityIncidentNumberOfConsumerClassActionCases" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="blkb_ChangeInCustomerFundsReceivable" abstract="false" name="ChangeInCustomerFundsReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_LineOfCreditFacilityVariableInterestRate" abstract="false" name="LineOfCreditFacilityVariableInterestRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="blkb_ScheduleOfEffectiveIncomeTaxRateTableTextBlock" abstract="false" name="ScheduleOfEffectiveIncomeTaxRateTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="blkb_COVID19Member" abstract="true" name="COVID19Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_AnnualDividendperShareApproved" abstract="false" name="AnnualDividendperShareApproved" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="blkb_NonoperatingIncomeExpenseExcludingInterestExpense" abstract="false" name="NonoperatingIncomeExpenseExcludingInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_GlobalHQMember" abstract="true" name="GlobalHQMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_GeneralMarketsGroupMember" abstract="true" name="GeneralMarketsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_ExerciseOfStockOptionsAndStockAppreciationRightsShares" abstract="false" name="ExerciseOfStockOptionsAndStockAppreciationRightsShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="blkb_USStatesMember" abstract="true" name="USStatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights" abstract="false" name="SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="blkb_AccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="AccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SeniorSecuredNoteSeriesA1Member" abstract="true" name="SeniorSecuredNoteSeriesA1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_PrepaidInsuranceCurrentandLongterm" abstract="false" name="PrepaidInsuranceCurrentandLongterm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_June2019SwapMember" abstract="true" name="June2019SwapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_ScheduleOfPrepaidExpensesAndOtherAssetsCurrentTableTextBlock" abstract="false" name="ScheduleOfPrepaidExpensesAndOtherAssetsCurrentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="blkb_PrepaidSoftwareMaintenanceCurrent" abstract="false" name="PrepaidSoftwareMaintenanceCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SeniorSecuredNoteSeriesA2Member" abstract="true" name="SeniorSecuredNoteSeriesA2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_ScheduleOfRestrictedCashTableTextBlock" abstract="false" name="ScheduleOfRestrictedCashTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="blkb_OthercountriesMember" abstract="true" name="OthercountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_CostOfRecurringMember" abstract="true" name="CostOfRecurringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_ExerciseOfStockOptionsAndStockAppreciationRightsValue" abstract="false" name="ExerciseOfStockOptionsAndStockAppreciationRightsValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantDateFairValue" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantDateFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AccruedCommissionsAndSalariesCurrentAndLongTerm" abstract="false" name="AccruedCommissionsAndSalariesCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_ThirdpartyTechnologyMember" abstract="true" name="ThirdpartyTechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount" abstract="false" name="LineofCreditFacilityAvailableIncreaseCapacityAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_EnterpriseMarketsGroupMember" abstract="true" name="EnterpriseMarketsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="blkb_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted" abstract="false" name="LongtermPurchaseCommitmentRemainingMinimumAmountCommitted" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SwinglineloansMember" abstract="true" name="SwinglineloansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
</xs:schema>
