The 1981 Australian Sports Car Championship was a CAMS sanctioned Australian motor racing title open to Group D Production Sports Cars.^[1] It was the thirteenth Australian Sports Car Championship^[2] and the last to be restricted to cars complying with Group D regulations. The championship was won by John Latham, driving a Porsche Turbo.^[3]

The championship was contested over a four-round series with Rounds 1, 2 and 3 each staged over two heats and Round 4 run as a single race.^[3]

Cars competed in two engine capacity classes:^[1]

• Class A^[3] - Over 2000cc^[1]
• Class B^[3] - Up to and including 2000cc^[1]

Championship points were awarded on a 9-6-4-3-2-1 basis for the first six placings in each class at each round.^[1] Bonus points were awarded on a 4-3-2-1 basis for the top four placings irrespective of class at each round.^[1]

Where rounds were run in multiple parts, drivers were allocated points on a 20-16-13-11-10-9-8-7-6-5-4-3-2-1 basis for the first fourteen positions in each part.^[1] These points were then aggregated to determine the placings for that round.^[1]