<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xmlns="http://www.sec.gov/edgar/ncen" xmlns:com="http://www.sec.gov/edgar/common">
  <schemaVersion>X0201</schemaVersion>
  <headerData>
    <submissionType>N-CEN</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <issuerCredentials>
          <cik>0001265389</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
        <fileNumber>811-21460</fileNumber>
      </filer>
      <flags>
        <returnCopyFlag>true</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
        <confirmingCopyFlag>false</confirmingCopyFlag>
      </flags>
      <investmentCompanyType>N-1A</investmentCompanyType>
    </filerInfo>
    <seriesClass>
      <reportSeriesClass>
        <rptSeriesClassInfo>
          <seriesId>S000010084</seriesId>
          <includeAllClassesFlag>true</includeAllClassesFlag>
        </rptSeriesClassInfo>
      </reportSeriesClass>
    </seriesClass>
  </headerData>
  <formData>
    <generalInfo reportEndingPeriod="2019-11-30" isReportPeriodLt12="N"/>
    <registrantInfo>
      <registrantFullName>Pioneer Series Trust II</registrantFullName>
      <investmentCompFileNo>811-21460</investmentCompFileNo>
      <registrantCik>0001265389</registrantCik>
      <registrantLei>549300457JBM10EZI688</registrantLei>
      <registrantstreet1>60 State Street</registrantstreet1>
      <registrantcity>Boston</registrantcity>
      <registrantzipCode>02109-1820</registrantzipCode>
      <registrantstate>US-MA</registrantstate>
      <registrantcountry>US</registrantcountry>
      <registrantphoneNumber>617-422-4947</registrantphoneNumber>
      <websites>
        <website webpage="www.amundipioneer.com/us"/>
      </websites>
      <locationBooksRecords>
        <locationBooksRecord>
          <officeName>Brown Brothers Harriman &amp; Co.</officeName>
          <officeAddress1>50 Post Office Sq.</officeAddress1>
          <officeCity>Boston</officeCity>
          <officeStateCountry officeCountry="US" officeState="US-MA"/>
          <officeRecordsZipCode>02110-1543</officeRecordsZipCode>
          <officePhone>617-772-1818</officePhone>
          <booksRecordsDesc>Books and records</booksRecordsDesc>
        </locationBooksRecord>
      </locationBooksRecords>
      <isRegistrantFirstFiling>N</isRegistrantFirstFiling>
      <isRegistrantLastFiling>N</isRegistrantLastFiling>
      <registrantFamilyInvComp isRegistrantFamilyInvComp="Y" familyInvCompFullName="The Pioneer Funds"/>
      <registrantClassificationType>N-1A</registrantClassificationType>
      <totalSeries>1</totalSeries>
      <isSecuritiesActRegistration>Y</isSecuritiesActRegistration>
      <directors>
        <director>
          <directorName>Diane Durnin</directorName>
          <crdNumber>004798101</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Marguerite A. Piret</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="811-05399"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Lorraine H. Monchak</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>David R. Bock</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Kenneth J. Taubes</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>Y</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>John E. Baumgardner Jr.</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Margaret B.W. Graham</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Benjamin M. Friedman</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Lisa M. Jones</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>Y</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Fred J. Ricciardi</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
        <director>
          <directorName>Thomas J. Perna</directorName>
          <crdNumber>N/A</crdNumber>
          <isDirectorInterestedPerson>N</isDirectorInterestedPerson>
          <fileNumbers>
            <fileNumberInfo fileNumber="N/A"/>
          </fileNumbers>
        </director>
      </directors>
      <chiefComplianceOfficers>
        <chiefComplianceOfficer>
          <ccoName>John Malone</ccoName>
          <crdNumber>002314031</crdNumber>
          <ccoStreet1>60 State Street</ccoStreet1>
          <ccoCity>Boston</ccoCity>
          <ccoStateCountry ccoCountry="US" ccoState="US-MA"/>
          <ccoZipCode>02109-1820</ccoZipCode>
          <ccoPhone>XXXXXX</ccoPhone>
          <isCcoChangedSinceLastFiling>N</isCcoChangedSinceLastFiling>
          <ccoEmployers>
            <ccoEmployer ccoEmployerName="N/A" ccoEmployerId="N/A"/>
          </ccoEmployers>
        </chiefComplianceOfficer>
      </chiefComplianceOfficers>
      <isRegistrantSubmittedMatter>N</isRegistrantSubmittedMatter>
      <isPreviousLegalProceeding>N</isPreviousLegalProceeding>
      <isPreviousProceedingTerminated>N</isPreviousProceedingTerminated>
      <isClaimFiled>N</isClaimFiled>
      <coveredByInsurancePolicy isCoveredByInsurancePolicy="Y" isClaimFiledDuringPeriod="N"/>
      <isFinancialSupportDuringPeriod>N</isFinancialSupportDuringPeriod>
      <isExemptionFromAct>N</isExemptionFromAct>
      <principalUnderwriters>
        <principalUnderwriter>
          <principalUnderwriterName>AMUNDI PIONEER DISTRIBUTOR, INC.</principalUnderwriterName>
          <principalUnderwriterFileNumber>8-41256</principalUnderwriterFileNumber>
          <principalUnderwriterCrdNumber>000024497</principalUnderwriterCrdNumber>
          <principalUnderwriterLei>549300OSI141GCUW7776</principalUnderwriterLei>
          <principalUnderWriterStateCountry principalUnderWriterCountry="US" principalUnderWriterState="US-MA"/>
          <isPrincipalUnderwriterAffiliatedWithRegistrant>Y</isPrincipalUnderwriterAffiliatedWithRegistrant>
        </principalUnderwriter>
      </principalUnderwriters>
      <isUnderwriterHiredOrTerminated>N</isUnderwriterHiredOrTerminated>
      <publicAccountants>
        <publicAccountant>
          <publicAccountantName>ERNST &amp; YOUNG LLP</publicAccountantName>
          <pcaobNumber>42</pcaobNumber>
          <publicAccountantLei>222100D7D98APMA9KM73</publicAccountantLei>
          <publicAccountantStateCountry publicAccountantCountry="US" publicAccountantState="US-MA"/>
        </publicAccountant>
      </publicAccountants>
      <isPublicAccountantChanged>N</isPublicAccountantChanged>
      <isMaterialWeakness>N</isMaterialWeakness>
      <isOpinionOffered>N</isOpinionOffered>
      <isMaterialChange>N</isMaterialChange>
      <isAccountingPrincipleChange>N</isAccountingPrincipleChange>
      <isPaymentErrorInNetAssetValue>N</isPaymentErrorInNetAssetValue>
      <isPaymentDividend>N</isPaymentDividend>
    </registrantInfo>
    <managementInvestmentQuestionSeriesInfo>
      <managementInvestmentQuestion>
        <mgmtInvFundName>Pioneer Select Mid Cap Growth Fund</mgmtInvFundName>
        <mgmtInvSeriesId>S000010084</mgmtInvSeriesId>
        <mgmtInvLei>5493003EFC54UVE6AT14</mgmtInvLei>
        <isFirstFilingByFund>N</isFirstFilingByFund>
        <numAuthorizedClass>5</numAuthorizedClass>
        <numAddedClass>0</numAddedClass>
        <numTerminatedClass>0</numTerminatedClass>
        <sharesOutstandings>
          <sharesOutstanding sharesOutstandingClassName="Pioneer Select Mid Cap Growth Fund: Class Y" sharesOutstandingClassId="C000027933" sharesOutstandingTickerSymbol="GROYX"/>
          <sharesOutstanding sharesOutstandingClassName="Pioneer Select Mid Cap Growth Fund: Class A" sharesOutstandingClassId="C000027930" sharesOutstandingTickerSymbol="PGOFX"/>
          <sharesOutstanding sharesOutstandingClassName="Pioneer Select Mid Cap Growth Fund: Class R" sharesOutstandingClassId="C000079046" sharesOutstandingTickerSymbol="PGRRX"/>
          <sharesOutstanding sharesOutstandingClassName="Pioneer Select Mid Cap Growth Fund: Class C" sharesOutstandingClassId="C000027932" sharesOutstandingTickerSymbol="GOFCX"/>
          <sharesOutstanding sharesOutstandingClassName="Pioneer Select Mid Cap Growth Fund: Class K" sharesOutstandingClassId="C000152821" sharesOutstandingTickerSymbol="PSMKX"/>
        </sharesOutstandings>
        <fundType>N/A</fundType>
        <isNonDiversifiedCompany>N</isNonDiversifiedCompany>
        <isForeignSubsidiary>N</isForeignSubsidiary>
        <isFundSecuritiesLending>N</isFundSecuritiesLending>
        <didFundLendSecurities>N</didFundLendSecurities>
        <paymentToAgentManagerType>N/A</paymentToAgentManagerType>
        <avgPortfolioSecuritiesValue>0.00000000</avgPortfolioSecuritiesValue>
        <netIncomeSecuritiesLending>0.00000000</netIncomeSecuritiesLending>
        <relyOnRuleType>N/A</relyOnRuleType>
        <isExpenseLimitationInPlace>N</isExpenseLimitationInPlace>
        <isExpenseReducedOrWaived>N</isExpenseReducedOrWaived>
        <isFeesWaivedRecoupable>N</isFeesWaivedRecoupable>
        <isExpenseWaivedRecoupable>N</isExpenseWaivedRecoupable>
        <investmentAdvisers>
          <investmentAdviser>
            <investmentAdviserName>AMUNDI PIONEER ASSET MANAGEMENT, INC</investmentAdviserName>
            <investmentAdviserFileNo>801-8255</investmentAdviserFileNo>
            <investmentAdviserCrdNo>000107719</investmentAdviserCrdNo>
            <investmentAdviserLei>GVETZ2DEF39OCQ4SSX41</investmentAdviserLei>
            <investmentAdviserStateCountry investmentAdviserState="US-MA" investmentAdviserCountry="US"/>
            <isInvestmentAdviserHired>N</isInvestmentAdviserHired>
          </investmentAdviser>
        </investmentAdvisers>
        <transferAgents>
          <transferAgent>
            <transferAgentName>DST Asset Manager Solutions, Inc.</transferAgentName>
            <transferAgentFileNo>84-00896</transferAgentFileNo>
            <transferAgentLei>N/A</transferAgentLei>
            <transferAgentStateCountry transferAgentState="US-MA" transferAgentCountry="US"/>
            <isTransferAgentAffiliated>N</isTransferAgentAffiliated>
            <isTransferAgentSubAgent>N</isTransferAgentSubAgent>
          </transferAgent>
        </transferAgents>
        <isTransferAgentHiredOrTerminated>N</isTransferAgentHiredOrTerminated>
        <pricingServices>
          <pricingService>
            <pricingServiceName>Intercontinental Exchange, Inc.</pricingServiceName>
            <pricingServiceLei>5493000F4ZO33MV32P92</pricingServiceLei>
            <pricingServiceStateCountry pricingServiceState="US-GA" pricingServiceCountry="US"/>
            <isPricingServiceAffiliated>N</isPricingServiceAffiliated>
          </pricingService>
          <pricingService>
            <pricingServiceName>Thompson Reuters Pricing Service</pricingServiceName>
            <pricingServiceLei>N/A</pricingServiceLei>
            <pricingServiceStateCountry pricingServiceState="US-NY" pricingServiceCountry="US"/>
            <isPricingServiceAffiliated>N</isPricingServiceAffiliated>
          </pricingService>
        </pricingServices>
        <isPricingServiceHiredOrTerminated>N</isPricingServiceHiredOrTerminated>
        <custodians>
          <custodian>
            <custodianName>Nordea Bank Abp</custodianName>
            <custodianLei>529900ODI3047E2LIV03</custodianLei>
            <custodianCountry>FI</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>BNP Paribas Securities Services, Frankfurt Branch</custodianName>
            <custodianLei>549300WCGB70D06XZS54</custodianLei>
            <custodianCountry>DE</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>BNP PARIBAS SECURITIES SERVICES</custodianName>
            <custodianLei>549300WCGB70D06XZS54</custodianLei>
            <custodianCountry>NL</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Citibank, N.A., Sao Paulo</custodianName>
            <custodianLei>E57ODZWZ7FF32TWEFA76</custodianLei>
            <custodianCountry>BR</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>RBC Investor Services Trust</custodianName>
            <custodianLei>5493002MUOV04NSPT571</custodianLei>
            <custodianCountry>CA</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>Brown Brothers Harriman &amp; Co.</custodianName>
            <custodianLei>5493006KMX1VFTPYPW14</custodianLei>
            <custodianStateCountry custodianState="US-MA" custodianCountry="US"/>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>N</isSubCustodian>
            <custodyType>Bank - section 17(f)(1) (15 U.S.C. 80a-17(f)(1))</custodyType>
          </custodian>
          <custodian>
            <custodianName>HSBC Bank Plc</custodianName>
            <custodianLei>MP6I5ZYZBEU3UXPYFY54</custodianLei>
            <custodianCountry>GB</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
          <custodian>
            <custodianName>BNP Paribas Securities Services</custodianName>
            <custodianLei>549300WCGB70D06XZS54</custodianLei>
            <custodianCountry>FR</custodianCountry>
            <isCustodianAffiliated>N</isCustodianAffiliated>
            <isSubCustodian>Y</isSubCustodian>
            <custodyType>Foreign custodian - rule 17f-5 (17 CFR 270.17f-5)</custodyType>
          </custodian>
        </custodians>
        <isCustodianHiredOrTerminated>N</isCustodianHiredOrTerminated>
        <shareholderServicingAgents>
          <shareholderServicingAgent>
            <shareholderServiceAgentName>DST Asset Manager Solutions, Inc.</shareholderServiceAgentName>
            <shareholderServiceAgentLei>84-00896</shareholderServiceAgentLei>
            <shareholderServiceIdNumberDesc>SEC File Number</shareholderServiceIdNumberDesc>
            <shareholderServiceAgentStateCountry shareholderServiceAgentState="US-MA" shareholderServiceAgentCountry="US"/>
            <isShareholderServiceAgentAffiliated>N</isShareholderServiceAgentAffiliated>
            <isShareholderServiceAgentSubshare>N</isShareholderServiceAgentSubshare>
          </shareholderServicingAgent>
        </shareholderServicingAgents>
        <isShareholderServiceHiredTerminated>N</isShareholderServiceHiredTerminated>
        <admins>
          <admin>
            <adminName>AMUNDI PIONEER ASSET MANAGEMENT, INC</adminName>
            <adminLei>GVETZ2DEF39OCQ4SSX41</adminLei>
            <adminStateCountry adminState="US-MA" adminCountry="US"/>
            <isAdminAffiliated>Y</isAdminAffiliated>
            <isAdminSubAdmin>N</isAdminSubAdmin>
          </admin>
          <admin>
            <adminName>BROWN BROTHERS HARRIMAN &amp; CO.</adminName>
            <adminLei>5493006KMX1VFTPYPW14</adminLei>
            <adminStateCountry adminState="US-MA" adminCountry="US"/>
            <isAdminAffiliated>N</isAdminAffiliated>
            <isAdminSubAdmin>Y</isAdminSubAdmin>
          </admin>
        </admins>
        <isAdminHiredOrTerminated>N</isAdminHiredOrTerminated>
        <brokers>
          <broker>
            <brokerName>ROYAL BANK OF CANADA</brokerName>
            <brokerFileNo>N/A</brokerFileNo>
            <brokerCrdNo>000031194</brokerCrdNo>
            <brokerLei>ES7IP3U3RHIGC71XBU11</brokerLei>
            <brokerCountry>CA</brokerCountry>
            <grossCommission>40108.87</grossCommission>
          </broker>
          <broker>
            <brokerName>BNY MELLON CAPITAL MARKETS, LLC</brokerName>
            <brokerFileNo>008-35255</brokerFileNo>
            <brokerCrdNo>000017454</brokerCrdNo>
            <brokerLei>VJW2DOOHGDT6PR0ZRO63</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>70438.1</grossCommission>
          </broker>
          <broker>
            <brokerName>JONESTRADING INSTITUTIONAL SERVICES</brokerName>
            <brokerFileNo>008-26089</brokerFileNo>
            <brokerCrdNo>000006888</brokerCrdNo>
            <brokerLei>2138008JJ5PA8H5UIL69</brokerLei>
            <brokerStateCountry brokerState="US-CA" brokerCountry="US"/>
            <grossCommission>64560.09</grossCommission>
          </broker>
          <broker>
            <brokerName>COWEN AND COMPANY</brokerName>
            <brokerFileNo>008-22522</brokerFileNo>
            <brokerCrdNo>000007616</brokerCrdNo>
            <brokerLei>549300WR155U7DVMIW58</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>39127.08</grossCommission>
          </broker>
          <broker>
            <brokerName>INSTINET, LLC</brokerName>
            <brokerFileNo>008-23669</brokerFileNo>
            <brokerCrdNo>000007897</brokerCrdNo>
            <brokerLei>549300MGMN3RKMU8FT57</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>60517.54</grossCommission>
          </broker>
          <broker>
            <brokerName>Merrill Lynch, Pierce, Fenner &amp; Smith Inc.</brokerName>
            <brokerFileNo>008-07221</brokerFileNo>
            <brokerCrdNo>000007691</brokerCrdNo>
            <brokerLei>8NAV47T0Y26Q87Y0QP81</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>103973.55</grossCommission>
          </broker>
          <broker>
            <brokerName>J.P. MORGAN SECURITIES LLC</brokerName>
            <brokerFileNo>008-35008</brokerFileNo>
            <brokerCrdNo>000000079</brokerCrdNo>
            <brokerLei>ZBUT11V806EZRVTWT807</brokerLei>
            <brokerStateCountry brokerState="US-NY" brokerCountry="US"/>
            <grossCommission>41183.57</grossCommission>
          </broker>
          <broker>
            <brokerName>Wells Fargo Securities LLC</brokerName>
            <brokerFileNo>008-65876</brokerFileNo>
            <brokerCrdNo>000126292</brokerCrdNo>
            <brokerLei>VYVVCKR63DVZZN70PB21</brokerLei>
            <brokerStateCountry brokerState="US-NC" brokerCountry="US"/>
            <grossCommission>41564.19</grossCommission>
          </broker>
          <broker>
            <brokerName>STEPHENS INC</brokerName>
            <brokerFileNo>008-01927</brokerFileNo>
            <brokerCrdNo>000003496</brokerCrdNo>
            <brokerLei>213800LH6T9XDYZCA534</brokerLei>
            <brokerStateCountry brokerState="US-AR" brokerCountry="US"/>
            <grossCommission>38565.33</grossCommission>
          </broker>
          <broker>
            <brokerName>KeyBanc Capital Markets Inc.</brokerName>
            <brokerFileNo>008-30177</brokerFileNo>
            <brokerCrdNo>000000566</brokerCrdNo>
            <brokerLei>2EQWV0180Z211YVAD813</brokerLei>
            <brokerStateCountry brokerState="US-OH" brokerCountry="US"/>
            <grossCommission>48732.93</grossCommission>
          </broker>
        </brokers>
        <aggregateCommission>969593.78</aggregateCommission>
        <principalTransactions>
          <principalTransaction>
            <principalName>Merrill Lynch, Pierce, Fenner &amp; Smith Inc.</principalName>
            <principalFileNo>008-07221</principalFileNo>
            <principalCrdNo>000007691</principalCrdNo>
            <principalLei>8NAV47T0Y26Q87Y0QP81</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>74519395</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Barclays Capital Inc.</principalName>
            <principalFileNo>008-41342</principalFileNo>
            <principalCrdNo>000019714</principalCrdNo>
            <principalLei>AC28XWWI3WIBK2824319</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>108231256</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Bank of Nova Scotia</principalName>
            <principalFileNo>N/A</principalFileNo>
            <principalCrdNo>N/A</principalCrdNo>
            <principalLei>L3I9ZG2KFGXZ61BMYR72</principalLei>
            <principalCountry>CA</principalCountry>
            <principalTotalPurchaseSale>25080736</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>TD Securities (USA) LLC.</principalName>
            <principalFileNo>008-36747</principalFileNo>
            <principalCrdNo>000018476</principalCrdNo>
            <principalLei>SUVUFHICNZMP2WKHG940</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>135805000</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Jefferies LLC</principalName>
            <principalFileNo>008-15074</principalFileNo>
            <principalCrdNo>000002347</principalCrdNo>
            <principalLei>58PU97L1C0WSRCWADL48</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>18813138</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Morgan Stanley &amp; Co</principalName>
            <principalFileNo>008-15869</principalFileNo>
            <principalCrdNo>000008209</principalCrdNo>
            <principalLei>9R7GPTSO7KV3UQJZQ078</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>10587258</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>J.P. MORGAN SECURITIES LLC</principalName>
            <principalFileNo>008-35008</principalFileNo>
            <principalCrdNo>000000079</principalCrdNo>
            <principalLei>ZBUT11V806EZRVTWT807</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>69234139</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Citigroup Global Markets Inc.</principalName>
            <principalFileNo>008-08177</principalFileNo>
            <principalCrdNo>000007059</principalCrdNo>
            <principalLei>MBNUM2BPBDO7JBLYG310</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>150255303</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>Goldman Sachs &amp; Co. LLC</principalName>
            <principalFileNo>008-00129</principalFileNo>
            <principalCrdNo>000000361</principalCrdNo>
            <principalLei>FOR8UP27PHTHYVLBNG30</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>12684240</principalTotalPurchaseSale>
          </principalTransaction>
          <principalTransaction>
            <principalName>BNY MELLON CAPITAL MARKETS, LLC</principalName>
            <principalFileNo>008-35255</principalFileNo>
            <principalCrdNo>000017454</principalCrdNo>
            <principalLei>VJW2DOOHGDT6PR0ZRO63</principalLei>
            <principalStateCountry principalState="US-NY" principalCountry="US"/>
            <principalTotalPurchaseSale>23698206</principalTotalPurchaseSale>
          </principalTransaction>
        </principalTransactions>
        <principalAggregatePurchase>668116245</principalAggregatePurchase>
        <isBrokerageResearchPayment>N</isBrokerageResearchPayment>
        <mnthlyAvgNetAssets>1986583434.43</mnthlyAvgNetAssets>
        <lineOfCredit hasLineOfCredit="Y">
          <lineOfCreditDetails>
            <lineOfCreditDetail>
              <isCreditLineCommitted>Committed</isCreditLineCommitted>
              <lineOfCreditSize>250000000</lineOfCreditSize>
              <lineOfCreditInstitutions>
                <lineOfCreditInstitution creditInstitutionName="Bank of Nova Scotia"/>
              </lineOfCreditInstitutions>
              <sharedCreditType creditType="Shared">
                <creditUser fundName="Pioneer Disciplined Value Fund" secFileNo="811-21664"/>
                <creditUser fundName="Pioneer Global Multisector Income Fund" secFileNo="811-10395"/>
                <creditUser fundName="Pioneer AMT-Free Municipal Fund" secFileNo="811-21460"/>
                <creditUser fundName="Pioneer Multi-Asset Ultrashort Income Fund" secFileNo="811-21108"/>
                <creditUser fundName="Pioneer Equity Income Fund" secFileNo="811-08657"/>
                <creditUser fundName="Pioneer Mid Cap Value Fund" secFileNo="811-06106"/>
                <creditUser fundName="Pioneer Fund" secFileNo="811-01466"/>
                <creditUser fundName="Pioneer Disciplined Growth Fund" secFileNo="811-08547"/>
                <creditUser fundName="Pioneer High Income Municipal Fund" secFileNo="811-21823"/>
                <creditUser fundName="Pioneer Strategic Income Fund" secFileNo="811-09223"/>
                <creditUser fundName="Pioneer Flexible Opportunities Fund" secFileNo="811-21978"/>
                <creditUser fundName="Pioneer Bond Fund" secFileNo="811-02864"/>
                <creditUser fundName="Pioneer Fundamental Growth Fund" secFileNo="811-21108"/>
                <creditUser fundName="Pioneer Core Equity Fund" secFileNo="811-01835"/>
                <creditUser fundName="Pioneer Multi-Asset Income Fund" secFileNo="811-21781"/>
                <creditUser fundName="Pioneer Global High Yield Fund" secFileNo="811-10395"/>
                <creditUser fundName="Pioneer High Yield Fund" secFileNo="811-09685"/>
                <creditUser fundName="Pioneer Floating Rate Fund" secFileNo="811-21978"/>
              </sharedCreditType>
              <isCreditLineUsed>N</isCreditLineUsed>
            </lineOfCreditDetail>
          </lineOfCreditDetails>
        </lineOfCredit>
        <isInterfundLending>N</isInterfundLending>
        <isInterfundBorrowing>N</isInterfundBorrowing>
        <isSwingPricing>N</isSwingPricing>
      </managementInvestmentQuestion>
    </managementInvestmentQuestionSeriesInfo>
    <signature registrantSignedName="Pioneer Series Trust II" signedDate="2019-12-27" signature="Mark E. Bradley" title="Treasurer and Chief Financial and Accounting Officer"/>
  </formData>
</edgarSubmission>
