The 2003 Trans-Am Series for the BFGoodrich Tires Cup was the 38th season of the Sports Car Club of America's Trans-Am Series. This year saw the series visit Puerto Rico for the first time; the first race since 1991 not in Canada or the United States. The Rookie of the Year was won by Jorge Diaz, Jr., the Owners Championship was won by the #7 Rocketsports Racing entry and the Manufacturers' Championship was won by Jaguar.
The 2003 schedule was released in February 2003 with 11 rounds, featuring the new for 2003 Puerto Rico Grand Prix, and an unconfirmed 12th round to be announced at a later date.[1] In March, the 2003 National Grand Prix of Washington D.C, scheduled for June 28–29, was cancelled due to local environmental and noise concerns.[2] In August, it was announced that the series would be added to the Grand Prix Americas CART weekend.[3]
| Rd. | Date | Race name | Track | |
|---|---|---|---|---|
| 1 | February 23 | Grand Prix of St. Petersburg |  Streets of St. Petersburg | |
| 2 | April 13 | Grand Prix of Long Beach | Streets of Long Beach | |
| 3 | May 18 | The Victoria Day Trans-Am Weekend |  Mosport Park | |
| 4 | May 26 | Lime Rock Grand Prix | Lime Rock Park | |
| 5 | June 22 | Trans Am 100 | Infineon Raceway | |
| 6 | July 4 | Cleveland Grand Prix | Cleveland Burke Lakefront Airport | |
| 7 | August 2 | Grand Prix de Trois-Rivières | Circuit Trois-Rivières | |
| 8 | August 24 | The Trans-Am 100 | Road America | |
| 9 | August 31 | MotoRock Mile High 100 | Streets of Denver | |
| 10 | September 28 | MotoRock Miami 100 | Miami Bayfront Park Street Circuit | |
| 11 | October 24 | Puerto Rico Grand Prix |  Isla Grande Airport Circuit |
| Place | Driver | Points |
|---|---|---|
| 1 | Scott Pruett | 340 |
| 2 | Johnny Miller | 264 |
| 3 | Michael Lewis | 228 |
| 4 | Jorge Diaz, Jr. | 219 |
| 5 | Bobby Sak | 209 |
| 6 | Randy Ruhlman | 186 |
| 7 | Stu Hayner | 178 |
| 8 | John Baucom | 173 |
| 9 | Tomy Drissi | 148 |
| 10 | Simon Gregg | 122 |
| 11 | Boris Said | 119 |
| 12 |  Joey Scarallo | 108 |
| 13 | Paul Gentilozzi | 85 |
| 14 | Max Lagod | 78 |
| 15 | Bob Ruman | 69 |
| 16 | Greg Pickett | 61 |
| results incomplete |