<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001861514</cik>
        <entityName>SIGHTLINE INVESTOR BLOCKER, LLC</entityName>
        <issuerAddress>
            <street1>6750 Via Austi Pkwy</street1>
            <street2>Suite 130</street2>
            <city>Las Vegas</city>
            <stateOrCountry>NV</stateOrCountry>
            <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
            <zipCode>89119</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>702-851-4747</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Liability Company</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2021</value>
        </yearOfInc>
    </primaryIssuer>

    <issuerList>
        <issuer>
            <cik>0001861515</cik>
            <entityName>SIGHTLINE INVESTOR HOLDINGS, LLC</entityName>
            <issuerAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </issuerAddress>
            <issuerPhoneNumber>702-851-4747</issuerPhoneNumber>
            <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
            <issuerPreviousNameList>
                <value>None</value>
            </issuerPreviousNameList>
            <edgarPreviousNameList>
                <value>None</value>
            </edgarPreviousNameList>
            <entityType>Limited Liability Company</entityType>
            <yearOfInc>
                <withinFiveYears>true</withinFiveYears>
                <value>2021</value>
            </yearOfInc>
        </issuer>
    </issuerList>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Joseph</firstName>
                <lastName>Pappano</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Mr. Pappano is a member of the Board of Managers of Sightline Payments Holdings LLC the sole manager of the Issuers.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <lastName>Goren</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Omer</firstName>
                <lastName>Sattar</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Mr. Sattar is a member of the Board of Managers of Sightline Payments Holdings LLC the sole manager of the Issuers.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Walter</firstName>
                <lastName>Kortschak</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Mr. Kortschak is a member of the Board of Managers of Sightline Payments Holdings LLC the sole manager of the Issuers.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Christopher</firstName>
                <lastName>Cruz</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Mr. Cruz is a member of the Board of Managers of Sightline Payments Holdings LLC the sole manager of the Issuers.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Elizabeth</firstName>
                <lastName>Chambers</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6750 Via Austi Pkwy</street1>
                <street2>Suite 130</street2>
                <city>Las Vegas</city>
                <stateOrCountry>NV</stateOrCountry>
                <stateOrCountryDescription>NEVADA</stateOrCountryDescription>
                <zipCode>89119</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Ms. Chambers is a member of the Board of Managers of Sightline Payments Holdings LLC the sole manager of the Issuers.</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Technology</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2021-04-09</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>56912</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>37296651</totalOfferingAmount>
            <totalAmountSold>37296651</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>9</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Sightline Investor Blocker, LLC</issuerName>
                <signatureName>/s/ Joseph Pappano</signatureName>
                <nameOfSigner>Joseph Pappano</nameOfSigner>
                <signatureTitle>Authorized Representative</signatureTitle>
                <signatureDate>2021-05-12</signatureDate>
            </signature>
            <signature>
                <issuerName>Sightline Investor Holdings, LLC</issuerName>
                <signatureName>/s/ Joseph Pappano</signatureName>
                <nameOfSigner>Joseph Pappano</nameOfSigner>
                <signatureTitle>Authorized Representative</signatureTitle>
                <signatureDate>2021-05-12</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
