Cirrus is a worldwide interbank network that provides cash to Mastercard cardholders.

As a subsidiary of Mastercard, it connects all Mastercard's credit, debit, and prepaid cards, as well as ATM cards issued by various banks worldwide bearing the Mastercard/Maestro logo.

[1] Founded in 1982, prior to its acquisition by Mastercard in 1987, Cirrus System, LLC was owned by Bank of Montreal, BayBanks Inc., First Interstate Bancorp, Mellon Bank, NBD Bancorp Inc., and Norwest Corp.[2] By default, Mastercard and Maestro cards are linked to the Cirrus network, but very often all three logotypes will be shown.

The first logo, advertised from 1982 until 1992, was then changed to match those representing the other subsidiaries of Mastercard, which acquired Cirrus in 1987.

This can also be noticed through the re-branding in 2016, since all the logos of Mastercard, Maestro and Cirrus have been equally modified.