John Leffler is a former Australian racing driver. Leffler is best known for driving open-wheelers and winning the Australian Drivers' Championship in 1976. Leffler drove Morris Coopers for many years in the 1960s. He finished second in the 1969 Rothmans 12 Hour Classic at Surfers Paradise driving a Morris Cooper S In the early 1970s he turned his hand to Formula Ford racing a Bowin P6F in which he won the 1973 TAA Formula Ford Driver to Europe Series. In 1974 he contested the Australian Formula 2 Championship and finished third.