Grand-Am Rolex Sports Car Series '2000–13

The season involved four classes, Daytona Prototypes (DP), Sports Racing Prototype II (SRPII), Grand Touring Sport (GTS), and Grand Touring (GT). 12 races were run from February 1, 2003 to November 2, 2003.

The season began with the Rolex 24 at Daytona on January 29 and finished with the EMCO Gears Classic at the Mid-Ohio Sports Car Course on September 17.