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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0002060033</cik>
        <entityName>MCI Preferred Income Fund VIII, LLC</entityName>
        <issuerAddress>
            <street1>2101 CEDAR SPRINGS ROAD</street1>
            <street2>SUITE 700</street2>
            <city>DALLAS</city>
            <stateOrCountry>TX</stateOrCountry>
            <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
            <zipCode>75201</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>888-418-3730</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Liability Company</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2024</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Megatel Capital Investment</firstName>
                <lastName>LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2101 Cedar Springs Road</street1>
                <street2>Suite 700</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75201</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>MCI Holdings</firstName>
                <lastName>LLC</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2101 Cedar Springs Road</street1>
                <street2>Suite 700</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75201</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Common Member of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Armin</firstName>
                <lastName>Afzalipour</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2101 Cedar Springs Road</street1>
                <street2>Suite 700</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75201</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Co-President of the Issuer's Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Arash</firstName>
                <lastName>Afzalipour</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2101 Cedar Springs Road</street1>
                <street2>Suite 700</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75201</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Co-President of the Issuer's Manager</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Real Estate</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0002060033-25-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2025-02-27</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>25000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Primus Financial Services, LLC</recipientName>
                <recipientCRDNumber>307060</recipientCRDNumber>
                <associatedBDName>International Assets Advisory, LLC</associatedBDName>
                <associatedBDCRDNumber>10645</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>111 North Orange Avenue</street1>
                    <street2>Suite 1000</street2>
                    <city>Orlando</city>
                    <stateOrCountry>FL</stateOrCountry>
                    <stateOrCountryDescription>FLORIDA</stateOrCountryDescription>
                    <zipCode>32801</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>AZ</state>
                    <description>ARIZONA</description>
                    <state>CO</state>
                    <description>COLORADO</description>
                    <state>DE</state>
                    <description>DELAWARE</description>
                    <state>FL</state>
                    <description>FLORIDA</description>
                    <state>GA</state>
                    <description>GEORGIA</description>
                    <state>IN</state>
                    <description>INDIANA</description>
                    <state>IA</state>
                    <description>IOWA</description>
                    <state>KY</state>
                    <description>KENTUCKY</description>
                    <state>MD</state>
                    <description>MARYLAND</description>
                    <state>MI</state>
                    <description>MICHIGAN</description>
                    <state>MT</state>
                    <description>MONTANA</description>
                    <state>NE</state>
                    <description>NEBRASKA</description>
                    <state>NY</state>
                    <description>NEW YORK</description>
                    <state>NC</state>
                    <description>NORTH CAROLINA</description>
                    <state>OK</state>
                    <description>OKLAHOMA</description>
                    <state>SC</state>
                    <description>SOUTH CAROLINA</description>
                    <state>SD</state>
                    <description>SOUTH DAKOTA</description>
                    <state>TX</state>
                    <description>TEXAS</description>
                    <state>UT</state>
                    <description>UTAH</description>
                    <state>WA</state>
                    <description>WASHINGTON</description>
                    <state>WI</state>
                    <description>WISCONSIN</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>500000000</totalOfferingAmount>
            <totalAmountSold>26105500</totalAmountSold>
            <totalRemaining>473894500</totalRemaining>
            <clarificationOfResponse>As of May 20, 2026</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>200</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>50000000</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse>Assuming Maximum Offering Amount raised. Includes Selling Commissions of 7%; Managing Broker-Dealer Fee of 2.5% (which may be re-allowed, in part, to certain members of the Selling Group); and up to 0.5% as a Servicing Fee to the Managing Broker Dealer.</clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>10000000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>Assuming Maximum Offering Amount raised. Consists of 2% of gross offering proceeds for organization and offering expenses.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>MCI Preferred Income Fund VIII, LLC</issuerName>
                <signatureName>Stacy Grace</signatureName>
                <nameOfSigner>Stacy Grace</nameOfSigner>
                <signatureTitle>by POA from Zach Ipour, Co-President</signatureTitle>
                <signatureDate>2026-05-22</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
