The 1975 USAC Championship Car season consisted of 13 races, beginning in Ontario, California on March 2 and concluding in Avondale, Arizona on November 9.

The USAC National Champion was A. J. Foyt and the Indianapolis 500 winner was Bobby Unser.

Note 1: Bobby Allison and George Follmer are not eligible for points.

Note 2: Jerry Grant scored points at Ontario but competed with an FIA license.

Note 3: Bentley Warren scored 100 points at Pocono, but forfeited those points due to a rule violation.