Cirrus (stylized as cirrus) is a worldwide ATM network. It is a subsidiary of Mastercard and based in Purchase, New York. Founded in 1982, it links Mastercard and Maestro credit, debit and prepaid cards and Cirrus ATM cards to a global network of millions of ATMs.

Cirrus® is the brand name that stands for the global Mastercard/Cirrus ATM Network—among the largest ATM networks in the world. The Cirrus brand represents immediate deposit account access convenience at millions of ATM locations worldwide.

By default, Mastercard and Maestro cards are linked to the Cirrus network, but very often all three logo types will be shown. Canadian, American and Saudi Arabian ATMs use this network alongside their local networks and many banks have adopted Cirrus as their international interbank network alongside either a local network, the rival Plus ATM network owned by Visa, or both. In countries such as India and Bangladesh, the Cirrus network also serves as a local interbank network as well as an international network. Since Cirrus is an ATM network, not a payment card, you can’t make payments in-person or online using Cirrus.