﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2023v5.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-11-11T02:20:41-00:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>541739963</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>Robert E Clayton CPA PC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>111 Harold Court</AddressLine1Txt>
        <CityNm>Winchester</CityNm>
        <StateAbbreviationCd>VA</StateAbbreviationCd>
        <ZIPCd>22602</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>480811089</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>Natural Science Collections Alliance</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>NATU</BusinessNameControlTxt>
      <PhoneNum>7037901745</PhoneNum>
      <USAddress>
        <AddressLine1Txt>950 Herndon Parkway STE 450</AddressLine1Txt>
        <CityNm>Herndon</CityNm>
        <StateAbbreviationCd>VA</StateAbbreviationCd>
        <ZIPCd>20170</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Jyotsna Pandey</PersonNm>
      <PersonTitleTxt>Executive Director</PersonTitleTxt>
      <PhoneNum>7037901745</PhoneNum>
      <SignatureDt>2024-11-11</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>Robert E Clayton</PreparerPersonNm>
      <PTIN>P00527390</PTIN>
      <PhoneNum>5406354848</PhoneNum>
      <PreparationDt>2024-11-11</PreparationDt>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2024-10-15 13:58:12Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="3">
    <IRS990EZ documentId="990EZ" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <AddressChangeInd>X</AddressChangeInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <WebsiteAddressTxt>www.nscalliance.org</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="990A">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>66224</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <MembershipDuesAmt>64550</MembershipDuesAmt>
      <OtherRevenueTotalAmt>1674</OtherRevenueTotalAmt>
      <TotalRevenueAmt>66224</TotalRevenueAmt>
      <FeesAndOtherPymtToIndCntrctAmt>56700</FeesAndOtherPymtToIndCntrctAmt>
      <OtherExpensesTotalAmt>3709</OtherExpensesTotalAmt>
      <TotalExpensesAmt>60409</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>5815</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>29828</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>35643</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>114217</BOYAmt>
        <EOYAmt>124543</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <OtherAssetsTotalDetail>
        <BOYAmt>535</BOYAmt>
        <EOYAmt>558</EOYAmt>
      </OtherAssetsTotalDetail>
      <Form990TotalAssetsGrp>
        <BOYAmt>114752</BOYAmt>
        <EOYAmt>125101</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>84924</BOYAmt>
        <EOYAmt>89458</EOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>29828</BOYAmt>
        <EOYAmt>35643</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <PrimaryExemptPurposeTxt>Support of natural science collections</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Publications newsletter and books providing technical and educational information on the care, management, preservation, and improvement of systematics collections.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Grants perform research and provide workshops on scientific methods for the care, management, preservation, and improvement of systematics collections.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Gil Nelson</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Trina Roberts</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Peter W Fritsch</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Rebecca Rundell</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Brian Atkinson</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>John M Bates</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Scott V Edwards</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Gunter Fischer</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Douglas S Jones</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>John McCormack</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>William Moser</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Scott A Schaefer</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Emily Sessa</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Garth Spellman</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Barbara Thiers</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Jennifer Zaspel</PersonNm>
        <TitleTxt>At-Large Representitve</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.50</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Jyotsna Pandey</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>005.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <OrganizationFiled990TInd>false</OrganizationFiled990TInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <Form1120PolFiledInd>false</Form1120PolFiledInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <TaxImposedUnderIRC4911Amt>0</TaxImposedUnderIRC4911Amt>
      <TaxImposedUnderIRC4912Amt>0</TaxImposedUnderIRC4912Amt>
      <TaxImposedUnderIRC4955Amt>0</TaxImposedUnderIRC4955Amt>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <BooksInCareOfDetail>
        <PersonNm>Burk Associates Inc</PersonNm>
        <USAddress>
          <AddressLine1Txt>950 Herdon Parkway</AddressLine1Txt>
          <CityNm>Herndon</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>20170</ZIPCd>
        </USAddress>
        <PhoneNum>7037901745</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <Form720FiledInd>false</Form720FiledInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="990A" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>67625</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>53275</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>57100</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>62425</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>64550</CurrentTaxYearAmt>
        <TotalAmt>304975</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>67625</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>53275</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>57100</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>62425</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>64550</CurrentTaxYearAmt>
        <TotalAmt>304975</TotalAmt>
      </TotalCalendarYear170Grp>
      <PublicSupportTotal170Amt>304975</PublicSupportTotal170Amt>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>15556</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>10223</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2661</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1410</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1674</CurrentTaxYearAmt>
        <TotalAmt>31524</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>336499</TotalSupportAmt>
      <PublicSupportCY170Pct>0.90630</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.80980</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Total509Grp>
        <TotalAmt>0</TotalAmt>
      </Total509Grp>
      <PublicSupportTotal509Amt>0</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <TotalAmt>0</TotalAmt>
      </GrossInvestmentIncome509Grp>
      <Post1975UBTIGrp>
        <TotalAmt>0</TotalAmt>
      </Post1975UBTIGrp>
      <NetIncomeFromOtherUBIGrp>
        <TotalAmt>0</TotalAmt>
      </NetIncomeFromOtherUBIGrp>
      <OtherIncome509Grp>
        <TotalAmt>0</TotalAmt>
      </OtherIncome509Grp>
      <TotalSupportCalendarYearGrp>
        <TotalAmt>0</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.00000</PublicSupportCY509Pct>
      <InvestmentIncomeCYPct>0.00000</InvestmentIncomeCYPct>
    </IRS990ScheduleA>
    <IRS990ScheduleO documentId="990O" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 8, Other Revenue</FormAndLineReferenceDesc>
        <ExplanationTxt>Joint Meeting Revenue 1,673</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 8, Other Revenue</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Income 1</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Bank charges credit card fees 873</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Insurance 2,086</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Joint Meeting Expense 750</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 24, Other Assets</FormAndLineReferenceDesc>
        <ExplanationTxt>Prepaid Expenses Beginning of year 535, End of year 558</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26, Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounts Payable Beginning of year 45,879, End of year 54,088</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26, Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Accrued Expenses Beginning of year 1,245, End of year 1,245</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26, Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Deferred Income Beginning of year 37,800, End of year 34,125</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>