The 2003 V8 Supercar season was the 44th year of touring car racing in Australia since the first runnings of the Australian Touring Car Championship and the fore-runner of the present day Bathurst 1000, the Armstrong 500.
There were 21 touring car race meetings held during 2003; a thirteen-round series for V8 Supercars, the 2003 V8 Supercar Championship Series (VCS), two of them endurance races; a six-round second tier V8 Supercar series 2003 Konica V8 Supercar Series (KVS) along with a non-point scoring race supporting the Bathurst 1000 and V8 Supercar support programme event at the 2003 Australian Grand Prix.