The 2021 Supercars Championship (commercially known as the 2021 Repco Supercars Championship) was a motor racing series for Supercars. It was the twenty-third running of the Supercars Championship and the twenty-fifth series in which Supercars have contested the Australian Touring Car Championship, the premier title in Australian motorsport. Atlanta-based international auto parts conglomerate Genuine Parts Company, through the consumer auto parts brand Repco, replaced Virgin Australia as naming rights sponsor under a five-year partnership, which was later expanded to eight years at the end of the 2022 prizegiving banquet.
Shane van Gisbergen and Triple Eight Race Engineering won the drivers' and teams' championship respectively with one round to go.[1][2]