John Leffler (27 May 1940 - 11 June 2021) was a former Australian racing driver.^[1] Leffler is best known for driving open-wheelers and winning the Australian Drivers' Championship in 1976.

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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.

In 1975 Leffler stepped up to the Australian Drivers' Championship (the "Gold Star") and driving a Bowin P8 Chevrolet finished fifth in the series. The following year he secured the 1976 Australian Drivers' Championship title in a Lola T400 with a string of consistent placings but without actually winning a round.

Leffler also co-drove for some of the leading Australian touring car drivers in endurance events. He co-drove with Bob Morris at the 1974 Sandown 250 finishing second in a Ron Hodgson Motors Holden Torana GTR XU-1 and at the 1978 Bathurst 1000 he came second with Allan Grice in a Craven Mild Racing Holden LX Torana SS A9X Hatchback. He is not related to Jason Leffler the IndyCar driver who was killed in 2013