Myki, stylised as myki, is a reloadable credit card-sized contactless smart card ticketing system used for electronic payment of fares on most public transport services in Melbourne and regional Victoria, Australia. Myki replaced the Metcard ticketing system and became fully operational at the end of 2012.

A contactless smart card is a contactless credential whose dimensions are credit card size. Its embedded integrated circuits can store data and communicate with a terminal via NFC. Commonplace uses include transit tickets, bank cards and passports.