The 1973 Australian Manufacturers' Championship was a CAMS sanctioned motor racing title for automobile manufacturers. It was the third Australian Manufacturers' Championship and the first to be contested with Group C Touring Cars.
Cars competed in four engine capacity classes:
Championship points were awarded on a 9-8-7-6-5-4-3-2-1 basis for the first nine positions in each class plus 4-3-2-1 for the first four outright positions for all rounds except the Bathurst round. For the Bathurst round only, championship points were awarded on an 18-16-14-12-10-8-6-4-2 basis for the first nine positions in each class plus 4-3-2-1 for the first four outright positions. Only the best placed car from each manufacturer in each class at each round was eligible to score points.