The 1975 Trans-Am Series was the tenth running of the Sports Car Club of America's premier series. All races except for the Six Hours of Watkins Glen ran for approximately one hundred miles.
The Drivers Championship was won by John Greenwood and the Manufacturers title was awarded to Chevrolet.[1]
| Round | Date | Circuit | Winning driver(s) | Winning vehicle | |
|---|---|---|---|---|---|
| 1 | June 1 | Pocono |  John Greenwood | Chevrolet Corvette | |
| 2 | June 1 | Seattle | Walt Maas | Datsun 280Z | |
| 3 | June 15 | Portland | John Greenwood | Chevrolet Corvette | |
| 4 | June 29 | Nelson Ledges | John Greenwood | Chevrolet Corvette | |
| 5 | July 12 | Watkins Glen | Babe Headley Paul Missuriello | Chevrolet Corvette | |
| 6 | July 26 | Road America | Jerry Hansen | Chevrolet Corvette | |
| 7 | September 7 | Brainerd | Jerry Hansen | Chevrolet Corvette |
Note: The Six Hours of Watkins Glen was also a round of the 1975 World Championship for Makes, and was won outright by Henri Pescarolo and Derek Bell driving an Alfa Romeo 33TT12.[2] Headley & Missuriello were the best placed of the Trans Am competitors.[2]