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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0002139656</cik>
        <entityName>Areim Fastigheter 6 (D) AB</entityName>
        <issuerAddress>
            <street1>REGERINGSGATAN 30-32 B</street1>
            <city>STOCKHOLM</city>
            <stateOrCountry>V7</stateOrCountry>
            <stateOrCountryDescription>SWEDEN</stateOrCountryDescription>
            <zipCode>111 53</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>46 8 501 055 00</issuerPhoneNumber>
        <jurisdictionOfInc>SWEDEN</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Other</entityType>
        <entityTypeOtherDesc>Private limited company</entityTypeOtherDesc>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2025</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Areim AB</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Regeringsgatan 30-32</street1>
                <city>Stockholm</city>
                <stateOrCountry>V7</stateOrCountry>
                <stateOrCountryDescription>SWEDEN</stateOrCountryDescription>
                <zipCode>111 53</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Areim Management 6 AB</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Regeringsgatan 30-32</street1>
                <city>Stockholm</city>
                <stateOrCountry>V7</stateOrCountry>
                <stateOrCountryDescription>SWEDEN</stateOrCountryDescription>
                <zipCode>111 53</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Robert</firstName>
                <middleName>Jan</middleName>
                <lastName>Bjork</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Regeringsgatan 30-32</street1>
                <city>Stockholm</city>
                <stateOrCountry>V7</stateOrCountry>
                <stateOrCountryDescription>SWEDEN</stateOrCountryDescription>
                <zipCode>111 53</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Board member of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Henrik</firstName>
                <middleName>John Erik</middleName>
                <lastName>Landelius Brinck</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Regeringsgatan 30-32</street1>
                <city>Stockholm</city>
                <stateOrCountry>V7</stateOrCountry>
                <stateOrCountryDescription>SWEDEN</stateOrCountryDescription>
                <zipCode>111 53</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Board member of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Leif</firstName>
                <middleName>Gustav</middleName>
                <lastName>Andersson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Regeringsgatan 30-32</street1>
                <city>Stockholm</city>
                <stateOrCountry>V7</stateOrCountry>
                <stateOrCountryDescription>SWEDEN</stateOrCountryDescription>
                <zipCode>111 53</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Chairman of the board of the Issuer</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Other Investment Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2026-05-04</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>1086000000</totalOfferingAmount>
            <totalAmountSold>3566501</totalAmountSold>
            <totalRemaining>1082433499</totalRemaining>
            <clarificationOfResponse>Total Offering Amount and Total Amount Sold converted from SEK to USD. Total Amount Sold reflects amount sold pursuant to Regulation D. Offering was primarily non-US and such non-US offering was in compliance with Regulation S.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>1</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse>Affiliates of the Issuer are entitled to a management fee and carried interest determined according to a waterfall disclosed in the offering documents. The estimate refers to the management fees that will accrue during the Issuer duration period.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Areim Fastigheter 6 (D) AB</issuerName>
                <signatureName>/s/ E. Olsen /s/ T. Rattik</signatureName>
                <nameOfSigner>Erika Olsen and Therese Rattik</nameOfSigner>
                <signatureTitle>Co-managing partners</signatureTitle>
                <signatureDate>2026-08-13</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
