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

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001457656</cik>
        <entityName>Magna Resources # 45-Montgomery #3 Joint Venture</entityName>
        <issuerAddress>
            <street1>8150 N. CENTRAL EXPRESSWAY, #1700</street1>
            <street2>CAMPBELL CENTRE II</street2>
            <city>DALLAS</city>
            <stateOrCountry>TX</stateOrCountry>
            <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
            <zipCode>75206</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>214-630-4990</issuerPhoneNumber>
        <jurisdictionOfInc>TEXAS</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>Magna Resources BD #45-Montgomery #3 Joint Venture</previousName>
            <previousName>Magna Resources WBD#1-Harrison #1 Joint Venture</previousName>
            <previousName>Magna Resources Management Corp</previousName>
        </edgarPreviousNameList>
        <entityType>Other</entityType>
        <entityTypeOtherDesc>Joint Venture</entityTypeOtherDesc>
        <yearOfInc>
            <yetToBeFormed>true</yetToBeFormed>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>C.</firstName>
                <middleName>E.</middleName>
                <lastName>Zimmerman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Campbell Centre II</street1>
                <street2>8150 N. Central Expwy., #1700</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75206</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Randal</firstName>
                <middleName>T.</middleName>
                <lastName>Rust</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Campbell Centre II</street1>
                <street2>8150 No. Central Expwy, #1700</street2>
                <city>Dallas</city>
                <stateOrCountry>TX</stateOrCountry>
                <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                <zipCode>75206</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Oil and Gas</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>$1,000,001 - $5,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <yetToOccur>true</yetToOccur>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isOtherType>true</isOtherType>
            <descriptionOfOtherType>Joint Venture interests in the Magna Resources BD #45-Montgomery #3 Joint Venture</descriptionOfOtherType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>15000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>N/A</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>Campbell Centre II</street1>
                    <street2>8150 N. Central Expwy., #1700</street2>
                    <city>Dallas</city>
                    <stateOrCountry>TX</stateOrCountry>
                    <stateOrCountryDescription>TEXAS</stateOrCountryDescription>
                    <zipCode>75206</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>1040000</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>1040000</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>0</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>114400</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>Organizational costs and Managing Venturer's fee.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Magna Resources # 45-Montgomery #3 Joint Venture</issuerName>
                <signatureName>C. E. Zimmerman</signatureName>
                <nameOfSigner>C. E. Zimmerman</nameOfSigner>
                <signatureTitle>President</signatureTitle>
                <signatureDate>2010-06-09</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
