<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2020v4.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2023-05-03T14:57:24-04:00</ReturnTs>
    <TaxPeriodEndDt>2021-06-30</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>201114485</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>JOHN C PARCELL IV CPA CFE</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>6711 US HIGHWAY 11</AddressLine1Txt>
        <CityNm>CANTON</CityNm>
        <StateAbbreviationCd>NY</StateAbbreviationCd>
        <ZIPCd>13617</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2021-03-15</TaxPeriodBeginDt>
    <Filer>
      <EIN>863551974</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>ST CATHERINE OF SIENA ACADEMY</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>STCA</BusinessNameControlTxt>
      <PhoneNum>3152218069</PhoneNum>
      <USAddress>
        <AddressLine1Txt>2 POWERS STREET</AddressLine1Txt>
        <CityNm>CANTON</CityNm>
        <StateAbbreviationCd>NY</StateAbbreviationCd>
        <ZIPCd>13617</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>DANIEL SWEENEY</PersonNm>
      <PersonTitleTxt>CHAIR &amp; TREASURER</PersonTitleTxt>
      <PhoneNum>3152218069</PhoneNum>
      <SignatureDt>2023-04-27</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>DAN</PersonFirstNm>
        <PersonLastNm>SWEENEY</PersonLastNm>
      </PersonFullName>
      <SSN>XXX-XX-XXXX</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>JOHN C PARCELL IV</PreparerPersonNm>
      <PTIN>P01238337</PTIN>
      <PhoneNum>3152655222</PhoneNum>
      <PreparationDt>2023-05-02</PreparationDt>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <TaxYr>2020</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="5">
    <IRS990EZ documentId="RetDoc2" referenceDocumentId="RetDoc4">
      <InitialReturnInd>X</InitialReturnInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <WebsiteAddressTxt>WWW.SIENAACADEMY.ORG</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="RetDoc5">X</Organization501c3Ind>
      <TypeOfOrganizationOtherInd>X</TypeOfOrganizationOtherInd>
      <TypeOfOrganizationOtherDesc>CHARTER</TypeOfOrganizationOtherDesc>
      <GrossReceiptsAmt>44779</GrossReceiptsAmt>
      <ContributionsGiftsGrantsEtcAmt>44779</ContributionsGiftsGrantsEtcAmt>
      <TotalRevenueAmt>44779</TotalRevenueAmt>
      <ExcessOrDeficitForYearAmt>44779</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesEOYAmt>44779</NetAssetsOrFundBalancesEOYAmt>
      <CashSavingsAndInvestmentsGrp>
        <EOYAmt>44779</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <Form990TotalAssetsGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>44779</EOYAmt>
      </Form990TotalAssetsGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>44779</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <PrimaryExemptPurposeTxt>THE OPERATION OF A SCHOOL FOR KINDERGARTEN THROUGH EIGHTH GRADE AGED STUDENTS.</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>THE OPERATION OF A SCHOOL FOR KINDERGARTEN THROUGH EIGHTH GRADE AGED STUDENTS.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentId="RetDoc1">DANIEL SWEENEY</PersonNm>
        <TitleTxt>CHAIR &amp; TREA</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>2.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentId="RetDoc1">DEVON SUTTON</PersonNm>
        <TitleTxt>VICE-CHAIR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm referenceDocumentId="RetDoc1">MICHELE LALLIER</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <Form1120PolFiledInd>false</Form1120PolFiledInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <BooksInCareOfDetail>
        <PersonNm>DANIEL SWEENEY</PersonNm>
        <USAddress>
          <AddressLine1Txt>2 POWERS STREET</AddressLine1Txt>
          <CityNm>CANTON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>13617</ZIPCd>
        </USAddress>
        <PhoneNum>3152218069</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd referenceDocumentId="RetDoc3">true</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="RetDoc5">
      <SchoolInd>X</SchoolInd>
    </IRS990ScheduleA>
    <IRS990ScheduleE documentId="RetDoc3">
      <NondiscriminatoryPolicyStmtInd>true</NondiscriminatoryPolicyStmtInd>
      <PolicyStmtInBrochuresEtcInd>true</PolicyStmtInBrochuresEtcInd>
      <PlcyPblczdViaBroadcastMediaInd>true</PlcyPblczdViaBroadcastMediaInd>
      <MaintainRacialCompRecsInd>true</MaintainRacialCompRecsInd>
      <MaintainScholarshipsRecsInd>true</MaintainScholarshipsRecsInd>
      <MaintainCpyOfBrochuresEtcInd>true</MaintainCpyOfBrochuresEtcInd>
      <MaintainCpyOfAllSolInd>true</MaintainCpyOfAllSolInd>
      <DiscriminateRaceStdntsRghtsInd>false</DiscriminateRaceStdntsRghtsInd>
      <DiscriminateRaceAdmissPlcyInd>false</DiscriminateRaceAdmissPlcyInd>
      <DiscriminateRaceEmplmFcultyInd>false</DiscriminateRaceEmplmFcultyInd>
      <DiscriminateRaceSchsInd>false</DiscriminateRaceSchsInd>
      <DiscriminateRaceEducPlcyInd>false</DiscriminateRaceEducPlcyInd>
      <DiscriminateRaceUseOfFcltsInd>false</DiscriminateRaceUseOfFcltsInd>
      <DiscriminateRaceAthltProgInd>false</DiscriminateRaceAthltProgInd>
      <DiscriminateRaceOtherActyInd>false</DiscriminateRaceOtherActyInd>
      <GovernmentFinancialAidRcvdInd>false</GovernmentFinancialAidRcvdInd>
      <GovernmentFinancialAidRvkdInd>false</GovernmentFinancialAidRvkdInd>
      <ComplianceWithRevProc7550Ind>true</ComplianceWithRevProc7550Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE E, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE POLICY IS DISCLOSED ON THE WEBSITE AND IN THE BROCHURES FOR THE SCHOOL.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleE>
    <IRS990ScheduleO documentId="RetDoc4">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART III</FormAndLineReferenceDesc>
        <ExplanationTxt>THE OPERATION OF A SCHOOL FOR KINDERGARTEN THROUGH EIGHTH GRADE AGED STUDENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <CompensationExplanation documentId="RetDoc1">
      <CompensationExplanationGrp>
        <PersonNm>DANIEL SWEENEY</PersonNm>
      </CompensationExplanationGrp>
      <CompensationExplanationGrp>
        <PersonNm>DEVON SUTTON</PersonNm>
      </CompensationExplanationGrp>
      <CompensationExplanationGrp>
        <PersonNm>MICHELE LALLIER</PersonNm>
      </CompensationExplanationGrp>
    </CompensationExplanation>
  </ReturnData>
</Return>
