The 1968 United States Road Racing Championship season was the sixth and final season of the Sports Car Club of America's United States Road Racing Championship. It began March 31, 1968, and ended August 18, 1968, after nine races. Mark Donohue won the season championship. The series would be revived thirty years later, but only for two years before becoming the Grand American Road Racing Championship.
| Rnd | Race | Length | Circuit | Location | Date | |
|---|---|---|---|---|---|---|
| 1 | USRRC Mexico City | 150miles | Autódromo Hermanos Rodríguez | Mexico City, Mexico | March 31 | |
| 2 | USRRC Riverside | 250km (160miles) | Riverside International Raceway | Riverside, California | April 28 | |
| 3 | Pimm's Cup Trophy | 150miles | Laguna Seca Raceway | Monterey, California | May 5 | |
| 4 | Vanderbilt Cup | 170miles | Bridgehampton Race Circuit | Bridgehampton, New York | May 19 | |
| 5 | Championnat Nord-Americain | 2 Hours, 45 Minutes | Circuit Mont-Tremblant | Saint-Jovite, Quebec | June 2 | |
| 6 | Pacific North West Grand Prix | 250km (160miles) | Pacific Raceways | Kent, Washington | June 30 | |
| 7 | Watkins Glen Sports Car Road Race | 200miles | Watkins Glen Grand Prix Race Course | Watkins Glen, New York | July 13 | |
| 8 | Road America 500 | 500miles | Road America | Elkhart Lake, Wisconsin | July 28 | |
| 9 | USRRC Mid-Ohio | 180miles | Mid-Ohio Sports Car Course | Lexington, Ohio | August 18 |
Overall winners in bold.
| Rnd | Circuit | Over 2.0 Winning Team | Under 2.0 Winning Team | Results |
|---|---|---|---|---|
| Over 2.0 Winning Driver(s) | Under 2.0 Winning Driver(s) | |||
| 1 | Mexico City |
| Werner Frank | Results |
 Moisés Solana |  Werner Frank | |||
| 2 | Riverside |
| Results | |
| Mark Donohue | Don Wester | |||
| 3 | Laguna Seca |
| Results | |
| Mark Donohue | Scooter Patrick | |||
| 4 | Bridgehampton |
| Results | |
| Skip Scott | Werner Frank | |||
| 5 | St. Jovite |
| Results | |
| Mark Donohue |  Horst Kroll | |||
| 6 | Kent |
| Results | |
| Skip Scott | Lew Florence | |||
| 7 | Watkins Glen |
| Results | |
| Mark Donohue | Werner Frank | |||
| 8 | Road America |
| Results | |
| Skip Scott Chuck Parsons | Cliff Phillips Al Cervenka | |||
| 9 | Mid-Ohio |
| Results | |
| Mark Donohue | Mike Hall |