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 1ý 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.