The 2015 International V8 Supercars Championship (often simplified to the 2015 V8 Supercars Championship) was an FIA-sanctioned international motor racing series for V8 Supercars. It was the seventeenth running of the V8 Supercar Championship Series and the nineteenth series in which V8 Supercars have contested the premier Australian touring car title.
Mark Winterbottom, driving for Prodrive Racing Australia, secured his first championship title with one race remaining, winning nine races during the season. Triple Eight Race Engineering won the Teams' Championship. The Enduro Cup was won by Garth Tander and Warren Luff, driving for the Holden Racing Team.
Holden, Nissan and Volvo were all represented by factory-backed teams.Ford reduced its commitment as a prelude to a complete exit from the series at the end of the season, while Mercedes-Benz continued to be represented without any factory support.
The following drivers competed in the 2015 championship.
The 2015 calendar was released on 12 September 2014.
The Auckland event moved from April to November, while the Winton and Perth events swapped positions on the calendar.
Each Super Sprint event featured two hours of Friday practice which incorporated testing time for the teams. The Townsville event reverted to its original 400-kilometre format, with a 200-kilometre race held on both Saturday and Sunday. The Saturday races of Super Sprint events were contested over a shorter distance of 60 kilometres per race, compared to the 100-kilometre races held in 2014. No twilight races were held. After holding a fourth race on the Friday in 2013 and 2014, the Auckland event was reduced to three races, the same as all other Super Sprint events.