The 2015 Australian GT Championship was a CAMS sanctioned Australian motor racing championship open to FIA GT3 cars and similar cars as approved for the championship. The Australian GT Sportscar Group Pty Ltd was appointed by CAMS as the Category Manager for the championship. The title, which was the 19th Australian GT Championship, was won by Christopher Mies, driving an Audi R8 Ultra.
The championship was contested over six rounds.
Drivers' titles were awarded in four divisions.
The 2015 Australian Tourist Trophy was awarded by the Confederation of Australian Motor Sport to the driver accumulating the highest aggregate points total from Rounds 2 and 4 of the Australian GT Championship. The title, which was the 25th Australian Tourist Trophy, was won by Christopher Mies driving an Audi R8 Ultra.