The Australian One and a Half Litre Championship was a CAMS sanctioned national motor racing title contested annually from 1964 to 1968.
It was open to drivers of cars complying with the Australian 1½ Litre Formula which specified open wheel racing cars fitted with unsupercharged engines using commercially available fuel and limited to 1500cc capacity.
The title was staged over a single race in the first two years and over a series of races in the last three.