-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 DQ8vY//OQjpr/Tu+6g8FreDfkyrNZpK7I49/DluXUyZlM8VCVxxFkYqBidOGf1ve
 00MeIKuh/syABAjyWSc+mA==

<SEC-DOCUMENT>0001101215-09-000035.txt : 20090302
<SEC-HEADER>0001101215-09-000035.hdr.sgml : 20090302
<ACCEPTANCE-DATETIME>20090302160403
ACCESSION NUMBER:		0001101215-09-000035
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090226
FILED AS OF DATE:		20090302
DATE AS OF CHANGE:		20090302

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLIANCE DATA SYSTEMS CORP
		CENTRAL INDEX KEY:			0001101215
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				311429215
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		17655 WATERVIEW PARKWAY
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75252
		BUSINESS PHONE:		9723485100

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Iaccarino Michael L
		CENTRAL INDEX KEY:			0001376989

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15749
		FILM NUMBER:		09647490

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		972.348.4366

	MAIL ADDRESS:	
		STREET 1:		17655 WATERVIEW PARKWAY
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75252
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-02-26</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001101215</issuerCik>
        <issuerName>ALLIANCE DATA SYSTEMS CORP</issuerName>
        <issuerTradingSymbol>ADS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001376989</rptOwnerCik>
            <rptOwnerName>Iaccarino Michael L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>17655 WATERVIEW PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75252-8012</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>former officer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-02-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>33974</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>30.61</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">All unvested shares previously held by the Reporting Person terminated when his employment with the Company ceased.</footnote>
    </footnotes>

    <remarks>Effective as of 1/13/09, the Reporting Person is no longer subject to Section 16.</remarks>

    <ownerSignature>
        <signatureName>Leigh Ann K. Epperson, Attorney in Fact</signatureName>
        <signatureDate>2009-03-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----