The 2003 Rolex Sports Car Series season was the fourth season of the Rolex Sports Car Series run by the Grand American Road Racing Association. 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. Barber Motorsports Park was added.
| Rnd | Race | Length/Duration | Circuit | Date | |
|---|---|---|---|---|---|
| 1 | Rolex 24 at Daytona | 24 Hours | Daytona International Speedway | February 1 February 2 | |
| 2 | Nextel Grand Prix of Miami | 250 Miles | Homestead-Miami Speedway | March 1 | |
| 3 | AJ's Fine Foods 250 | 250 Miles | Phoenix International Raceway | May 3 | |
| 4 | Barber 250 | 250 Miles | Barber Motorsports Park | May 18 | |
| 5 | Grand American 400 | 400 km | California Speedway | June 8 | |
| 6 | Sahlen's Six Hours of the Glen | 6 Hours | Watkins Glen International | June 22 | |
| 7 | Mid-Ohio Road Racing Classic | 400 km | Mid-Ohio Sports Car Course | June 28 | |
| 8 | Paul Revere 250 | 250 Miles | Daytona International Speedway | July 3 | |
| 9 | Bully Hill Vineyards 250 | 250 Miles | Watkins Glen International | August 8 | |
| 10 | 6 Hours of Mont-Tremblant | 6 Hours | Circuit Mont-Tremblant | September 21 | |
| 11 | VIR 400 | 400 km | Virginia International Raceway | October 5 | |
| 12 | Grand American Champions Weekend | 3 Hours | Daytona International Speedway | November 2 |
Overall winners in bold.
| Rnd | Circuit | DP Winning Teams | SRPII Winning Teams | GTS Winning Teams | GT Winning Teams |
|---|---|---|---|---|---|
| DP Winning Drivers | SRPII Winning Drivers | GTS Winning Drivers | GT Winning Drivers | ||
| 1 | Daytona | #88 Multimatic Motorsports | #5 Team Seattle/Essex Racing | #24 Perspective Racing | #66 The Racers Group |
| Scott Maxwell David Brabham David Empringham | Ross Bentley Don Kitch Joe Pruskowski Justin Pruskowski | Jérôme Policand João Barbosa Michel Neugarten Andy Wallace | Kevin Buckler Michael Schrom Jörg Bergmeister Timo Bernhard | ||
| 2 | Homestead | #59 Brumos Racing | #80 G&W Motorsports | #18 Murray's Speed & Custom | #33 Scuderia Ferrari of Washington |
| J. C. France Hurley Haywood | Steve Marshall Danny Marshall Shawn Bayliff | Jon Leavy Ken Bupp | Cort Wagner Brent Martini | ||
| 3 | Phoenix | #59 Brumos Racing | #80 G&W Motorsports1 | #48 Heritage Motorsports | #33 Scuderia Ferrari of Washington |
| J. C. France Hurley Haywood | Steve Marshall Danny Marshall Shawn Bayliff | Tommy Riggins David Machavern | Cort Wagner Brent Martini | ||
| 4 | Barber | #54 Bell Motorsports | No Entries | #31 Mosler Automotive | #69 Marcus Motorsports |
| Forest Barber Terry Borcheller | João Barbosa Justin Bell | Brian Cunningham Hugh Plumb | |||
| 5 | California | #58 Brumos Racing | #48 Heritage Motorsports | #33 Scuderia Ferrari of Washington | |
| David Donohue Mike Borkowski | Tommy Riggins David Machavern | Cort Wagner Brent Martini | |||
| 6 | Watkins Glen | #58 Brumos Racing | #80 G&W Motorsports | #48 Heritage Motorsports | #83 Rennwerks Motorsports |
| David Donohue Mike Borkowski Scott Goodyear | Steve Marshall Robert Prilika Shawn Bayliff | Tommy Riggins David Machavern Scott Lagasse | Seth Neiman Johannes van Overbeek Lonnie Pechnik | ||
| 7 | Mid-Ohio | #54 Bell Motorsports | #80 G&W Motorsports1 | #48 Heritage Motorsports | #98 Schumacher Racing |
| Forest Barber Terry Borcheller | Steve Marshall Danny Marshall Shawn Bayliff | Tommy Riggins David Machavern | Larry Schumacher B. J. Zacharias | ||
| 8 | Daytona | #54 Bell Motorsports | #80 G&W Motorsports1 | #48 Heritage Motorsports | #33 Scuderia Ferrari of Washington |
| Forest Barber Terry Borcheller | Steve Marshall Robert Prilika Shawn Bayliff | Tommy Riggins David Machavern | Cort Wagner Brent Martini | ||
| 9 | Watkins Glen | #54 Bell Motorsports | No Entries | #05 Team Re/Max Racing | #33 Scuderia Ferrari of Washington |
| Forest Barber Terry Borcheller | Rick Carelli John Metcalf David Liniger | Cort Wagner Brent Martini | |||
| 10 | Mont-Tremblant | #58 Brumos Racing | #48 Heritage Motorsports | #33 Scuderia Ferrari of Washington | |
| David Donohue Mike Borkowski Sascha Maassen | Tommy Riggins João Barbosa David Machavern | Cort Wagner Brent Martini | |||
| 11 | Virginia | #54 Bell Motorsports | #12 G&W Motorsports | #06 ICY/SL Motorsports | #33 Scuderia Ferrari of Washington |
| Forest Barber Andy Pilgrim Terry Borcheller | Davy Jones Robert Prilika Danny Marshall | Paul Alderman Dave Rosenblum Steve Lisa | Cort Wagner Brent Martini | ||
| 12 | Daytona | #54 Bell Motorsports | #80 G&W Motorsports1 | #40 Derhaag Motorsports | #33 Scuderia Ferrari of Washington |
| Forest Barber Terry Borcheller | Davy Jones Robert Prilika Joe Masessa | Simon Gregg Justin Bell | Cort Wagner Brent Martini |