Greg Leffler (born December 27, 1951), is a former driver in the CART Championship Car series.
Leffler raced in the 1980âÂÂ1983 seasons, with 13 career starts, including the 1980 Indianapolis 500. He finished in the top-ten twice, with his best finish in sixth position in 1982 at Riverside. In 1979, Leffler was the USAC Sprint Car National Series Champion.
Leffler lives in Churubusco, Indiana.