MasterCard International Incorporated ( ) is a multinational corporation based in Purchase, New York, USA. Throughout the world, its principal business is to process payments between the banks of merchants and the banks of purchasers that use its "MasterCard" brand debit and credit cards to make purchases. MasterCard International Incorporated has been a publicly traded company since 2006. Prior to its initial public offering, MasterCard International Incorporated was a membership organization owned by the 25,000+ financial institutions that issue its card. Since 2006, the company has marketed itself as MasterCard Worldwide to indicate its status as a global company and to distinguish the corporate entity from its main product, namely the MasterCard Card.

It was originally created by United California Bank (later First Interstate Bank, subsequently merged into Wells Fargo Bank), Wells Fargo, Crocker National Bank (also subsequently merged into Wells Fargo), and the Bank of California (subsequently merged into the Union Bank of California) as a competitor to the BankAmericard issued by Bank of America. BankAmericard is now the VISA credit card, issued by Visa International.