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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-08-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000885725</issuerCik>
        <issuerName>BOSTON SCIENTIFIC CORP</issuerName>
        <issuerTradingSymbol>BSX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000901430</rptOwnerCik>
            <rptOwnerName>ABELE JOHN E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BOSTON SCIENTIFIC CORP</rptOwnerStreet1>
            <rptOwnerStreet2>ONE BOSTON SCIENTIFIC PLACE</rptOwnerStreet2>
            <rptOwnerCity>NATICK</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01760-1537</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Forward Sale Contract (obligation to sell)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-08-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>486090</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2012-08-27</value>
            </exerciseDate>
            <expirationDate>
                <value>2012-08-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>486090</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>486090</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On March 1, 2010, the reporting person entered into a Rule 105b-1 trading plan with an unaffiliated commercial bank to execute a series of variable prepaid forward sale contracts.  Under the contract reported on this form, the reporting person will deliver to the bank up to 486,090 shares of the Issuer's common stock depending on market prices at maturity on August 27, 2012.  If the market price per share at maturity is equal to or less than the floor price of $5.3650 per share, the reporting person will deliver 486,090 shares to the bank.  If the market price per share at maturity is greater than the floor price, the reporting person will deliver a fewer number of shares.  In exchange, the bank is obligated to pay $1,773,353.54 to the reporting person two business days after the date of the contract.  At the option of the reporting person, the contract may be settled at maturity by delivering cash in lieu of stock.</footnote>
        <footnote id="F2">The reporting person pledged 486,090 shares of the Issuer's common stock to secure its obligations under the contract and retains dividends and voting rights in the shares during the term of the pledge.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Michelle K. Gewandter/Attorney-in-fact</signatureName>
        <signatureDate>2010-08-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
