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      <liveTestFlag>LIVE</liveTestFlag>
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        <issuerCredentials>
          <cik>0000710828</cik>
          <ccc>XXXXXXXX</ccc>
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      <flags>
        <returnCopyFlag>false</returnCopyFlag>
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    <generalInfo isReportPeriodLt12="N" reportEndingPeriod="2018-12-31"/>
    <registrantInfo>
      <registrantFullName>METROPOLITAN TOWER SEPARATE ACCOUNT ONE</registrantFullName>
      <investmentCompFileNo>811-03617</investmentCompFileNo>
      <registrantCik>0000710828</registrantCik>
      <registrantLei>549300ELU2IGIUHZYB71</registrantLei>
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      <registrantstreet2>200 Park Avenue</registrantstreet2>
      <registrantcity>New York</registrantcity>
      <registrantzipCode>10166</registrantzipCode>
      <registrantstate>US-NY</registrantstate>
      <registrantcountry>US</registrantcountry>
      <registrantphoneNumber>202-659-6901</registrantphoneNumber>
      <websites>
        <website webpage="N/A"/>
      </websites>
      <locationBooksRecords>
        <locationBooksRecord>
          <officeName>Heather Harker</officeName>
          <officeAddress1>200 Park Avenue</officeAddress1>
          <officeCity>New York</officeCity>
          <officeStateCountry officeState="US-NY" officeCountry="US"/>
          <officeRecordsZipCode>10166</officeRecordsZipCode>
          <officePhone>202-659-6901</officePhone>
          <booksRecordsDesc>paper/electronic</booksRecordsDesc>
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      <registrantClassificationType>N-6</registrantClassificationType>
      <isSecuritiesActRegistration>Y</isSecuritiesActRegistration>
      <chiefComplianceOfficers>
        <chiefComplianceOfficer>
          <ccoName>Elisabeth Bedore</ccoName>
          <crdNumber>005311786</crdNumber>
          <ccoStreet1>One MetLife Way</ccoStreet1>
          <ccoCity>Whippany</ccoCity>
          <ccoStateCountry ccoState="US-NJ" ccoCountry="US"/>
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          <isCcoChangedSinceLastFiling>N</isCcoChangedSinceLastFiling>
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      <isRegistrantSubmittedMatter>N</isRegistrantSubmittedMatter>
      <isPreviousLegalProceeding>N</isPreviousLegalProceeding>
      <isPreviousProceedingTerminated>N</isPreviousProceedingTerminated>
      <isFinancialSupportDuringPeriod>N</isFinancialSupportDuringPeriod>
      <releaseNumbers isExemptionFromAct="Y">
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        <releaseNumberInfo releaseNumber="IC-13580"/>
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        <releaseNumberInfo releaseNumber="IC-20235"/>
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      <principalUnderwriters>
        <principalUnderwriter>
          <principalUnderwriterName>Metlife Investors Distribution Company</principalUnderwriterName>
          <principalUnderwriterFileNumber>008-53064</principalUnderwriterFileNumber>
          <principalUnderwriterCrdNumber>000107622</principalUnderwriterCrdNumber>
          <principalUnderwriterLei>N/A</principalUnderwriterLei>
          <principalUnderWriterStateCountry principalUnderWriterState="US-MO" principalUnderWriterCountry="US"/>
          <isPrincipalUnderwriterAffiliatedWithRegistrant>Y</isPrincipalUnderwriterAffiliatedWithRegistrant>
        </principalUnderwriter>
      </principalUnderwriters>
      <isUnderwriterHiredOrTerminated>N</isUnderwriterHiredOrTerminated>
      <publicAccountants>
        <publicAccountant>
          <publicAccountantName>Deloitte &amp; Touche, LLP</publicAccountantName>
          <pcaobNumber>34</pcaobNumber>
          <publicAccountantLei>N/A</publicAccountantLei>
          <publicAccountantStateCountry publicAccountantState="US-NY" publicAccountantCountry="US"/>
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      </publicAccountants>
      <isPublicAccountantChanged>N</isPublicAccountantChanged>
      <isOpinionOffered>N</isOpinionOffered>
      <isMaterialChange>N</isMaterialChange>
      <isAccountingPrincipleChange>N</isAccountingPrincipleChange>
    </registrantInfo>
    <unitInvestmentTrust>
      <depositors>
        <depositor>
          <depositorName>Metropolitan Tower Life Insurance Company</depositorName>
          <depositorCrdNo>N/A</depositorCrdNo>
          <depositorLei>C66E209AQ6YDHBXH2I29</depositorLei>
          <depositorStateCountry depositorState="US-NE" depositorCountry="US"/>
          <depositorUltimateParentname>Metlife, Inc.</depositorUltimateParentname>
        </depositor>
      </depositors>
      <uitAdmins>
        <uitAdmin>
          <uitAdminName>Brighthouse Financial, Inc.</uitAdminName>
          <uitAdminLei>5493003T8SZSHOGGAW52</uitAdminLei>
          <uitAdminStateCountry uitAdminState="US-NC" uitAdminCountry="US"/>
          <isUitAdminAffiliated>N</isUitAdminAffiliated>
          <isUitAdminSubAdmin>N</isUitAdminSubAdmin>
        </uitAdmin>
      </uitAdmins>
      <isUitAdminHiredTerminated>N</isUitAdminHiredTerminated>
      <registrantSeparateInsuranceAccount isRegistrantSeparateInsuranceAccount="Y" separateAccountSeriesId="S000011671"/>
      <numOfContracts>65</numOfContracts>
      <contractSecurities>
        <contractSecurity separateAccountSecurityName="Variable Life Insurance" separateAccountContractId="C000032034" numContractsSold="0" numContractsAffected="0" numContractsAffectedRedeemed="0" separateAccountTotalAsset="4994612.00" grossPremiumReceived="97018.00" grossPremiumReceivedSection1035="0" contractValueRedeemed="442836.00" contractValueRedeemedSection1035="0"/>
      </contractSecurities>
      <isRule6C7Reliance>N</isRule6C7Reliance>
      <isRule11A2Reliance>N</isRule11A2Reliance>
    </unitInvestmentTrust>
    <attachmentsTab>
      <isLegalProceedings>false</isLegalProceedings>
      <isProvisionFinancialSupport>false</isProvisionFinancialSupport>
      <isIPAReportInternalControl>false</isIPAReportInternalControl>
      <isChangeAccPrinciples>false</isChangeAccPrinciples>
      <isInfoRequiredEO>false</isInfoRequiredEO>
      <isOtherInfoRequired>false</isOtherInfoRequired>
    </attachmentsTab>
    <signature registrantSignedName="METROPOLITAN TOWER SEPARATE ACCOUNT ONE" signature="Robert Oldham" title="Vice President" signedDate="2019-03-15"/>
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