The 1991 Camel GT Championship and Exxon Supreme GT Series seasons were the 21st season of the IMSA GT Championship auto racing series. It was for GTP and Lights classes of prototypes, as well as Grand Tourer-style racing cars which ran in the GTO and GTU classes, as well as a tube-frame All-American Challenge (AAC) class during select rounds. It began February 2, 1991, and ended October 13, 1991, after nineteen rounds.
The GT and Prototype classes did not participate in all events, nor did they race together at shorter events. The AAC class only participated in GT-only events. Races marked with All had all classes on track at the same time.
| Rnd | Race | Length | Class | Circuit | Date |
|---|---|---|---|---|---|
| 1 | SunBank 24 at Daytona | 24 Hours | All | Daytona International Speedway | February 2 February 3 |
| 2 | Toyota Camel Grand Prix of Palm Beach | 1 Hour | GTO/GTU | West Palm Beach street course | March 2 |
| 2 Hours | Proto | March 3 | |||
| 30 Minutes | AAC | ||||
| 3 | 12 Hours of Sebring | 12 Hours | All | Sebring International Raceway | March 16 |
| 4 | Nissan Camel Grand Prix of Miami | 1 Hour | GT | Streets of Miami | April 6 |
| 2 Hours | Proto | April 7 | |||
| 5 | Toyota Grand Prix of Long Beach | 1 Hour | GT | Long Beach Street Circuit | April 13 |
| 6 | Nissan Grand Prix of Atlanta | 300 km | Proto | Road Atlanta | April 28 |
| 7 | Camel Grand Prix of the Heartland | 300 km | Proto | Heartland Park | May 5 |
| 8 | Nissan Grand Prix of Mosport | 300 km | GT | Mosport Park | May 20 |
| 9 | Toyota Trucks Lime Rock Grand Prix | 2 Hours | Proto | Lime Rock Park | May 26 |
| 10 | Nissan Grand Prix of Ohio | 1 Hour | GT | Mid-Ohio Sports Car Course | June 1 |
| 300 km | Proto | June 2 | |||
| 11 | Nissan Grand Prix du Mardi Gras | 1 Hour | GT | New Orleans street course | June 15 |
| 2 Hours | Proto | June 16 | |||
| 12 | Camel Continental | 500 km | Proto | Watkins Glen International | June 30 |
| 13 | Grand Auto Supply Camel GT | 1 Hour | GT | Laguna Seca Raceway | July 20 |
| 300 km | Proto | July 21 | |||
| 14 | G.I. Joe's/Camel Grand Prix | 300 km | Proto | Portland International Raceway | July 28 |
| 1 Hour 30 Minutes | GT | ||||
| 15 | Nissan Grand Prix of Road America | 300 km | Proto | Road America | August 25 |
| 200 km | GT | ||||
| 16 | Road Atlanta 300 | 1 Hour 45 Minutes | GT | Road Atlanta | September 1 |
| 17 | The New York 500 | 500 km | GT | Watkins Glen International | September 22 |
| 18 | The Jamesway 300 | 2 Hours | GT | Lime Rock Park | September 28 |
| 19 | Camel Grand Prix of Greater San Diego | 1 Hour | GT | Del Mar Fairgrounds | October 12 |
| 2 Hours | Proto | October 13 |
| Rnd | Circuit | GTP Winning Team | Lights Winning Team | GTO Winning Team | GTU Winning Team | Results |
|---|---|---|---|---|---|---|
| GTP Winning Drivers | Lights Winning Drivers | GTO Winning Drivers | GTU Winning Drivers | |||
| 1 | Daytona |  #7 Joest Racing |  #48 Comptech Acura | #15 Whistler Mustang | #82 Greer Racing | Results |
Frank Jelinski "John Winter" Henri Pescarolo Bob Wollek Hurley Haywood | Parker Johnstone Steve Cameron Doug Peterson Bob Lesnett | Mark Martin Wally Dallenbach Jr. Robby Gordon | Dick Greer Al Bacon Mike Mees Peter Uria | |||
| 2 | Palm Beach |  #2 Bud Light Jaguar | #48 Comptech Racing | #62 Mazda Motorsports | #07 Full Time Racing | Results |
| Davy Jones | Parker Johnstone | Peter Halsmer | John Fergus | |||
| 3 | Sebring | #83 Nissan Performance | #8 Essex Racing | #15 Roush Racing | #95 Leitzinger Racing | Results |
 Geoff Brabham Gary Brabham Derek Daly | Charles Morgan Jim Pace | Robby Gordon Max Jones | Bob Leitzinger David Loring | |||
| 4 | Miami | #3 Bud Light Jaguar | #48 Comptech Racing | #62 Mazda Motorsports | #96 Leitzinger Racing | Results |
 Raul Boesel | Parker Johnstone | Peter Halsmer | David Loring | |||
| 5 | Long Beach | Did not participate | Did not participate | #75 Cunningham Racing | #07 Full Time Racing | Results |
 Steve Millen | John Fergus | |||||
| 6 | Road Atlanta | #2 Bud Light Jaguar | #48 Comptech Racing | Did not participate | Did not participate | Results |
| Davy Jones | Parker Johnstone | |||||
| 7 | Heartland | #84 Nissan Performance | #48 Comptech Racing | Did not participate | Did not participate | Results |
| Chip Robinson | Parker Johnstone | |||||
| 8 | Mosport | Did not participate | Did not participate | #62 Mazda Motorsports | #07 Full Time Racing | Results |
| Pete Halsmer | John Fergus | |||||
| 9 | Lime Rock | #84 Nissan Performance |  #19 David Tennyson | Did not participate | Did not participate | Results |
| Chip Robinson | David Tennyson Ken Knott | |||||
| 10 | Mid-Ohio | #2 Bud Light Jaguar | #48 Comptech Racing | #76 Cunningham Racing | #07 Full Time Racing | Results |
| Davy Jones | Parker Johnstone | Jeremy Dale | John Fergus | |||
| 11 | New Orleans | #64 MTI Racing | #19 David Tennyson | #63 Mazda Motorsports | #96 Leitzinger Racing | Results |
| Wayne Taylor | David Tennyson | Price Cobb | David Loring | |||
| 12 | Watkins Glen | #99 All American Racers | #48 Comptech Racing | Did not participate | Did not participate | Results |
 Juan Manuel Fangio II | Parker Johnstone | |||||
| 13 | Laguna Seca | #2 Bud Light Jaguar | #80 Bieri Racing | #63 Mazda Motorsports | #07 Full Time Racing | Results |
| Davy Jones |  Ruggero Melgrati | Price Cobb | Jeff Purner | |||
| 14 | Portland | #99 All American Racers | #80 Bieri Racing | #9 Roush Racing | #00 Full Time Racing | Results |
| Juan Manuel Fangio II | Ruggero Melgrati | Robby Gordon | John Fergus | |||
| 15 | Road America | #2 Bud Light Jaguar | #9 Essex Racing Team | #75 Cunningham Racing | #00 Full Time Racing | Results |
| Davy Jones | Jim Pace | Steve Millen | John Fergus | |||
| 16 | Road Atlanta | Did not participate | Did not participate | #9 Roush Racing | #07 Full Time Racing | Results |
| Robby Gordon | Jeff Purner | |||||
| 17 | Watkins Glen | Did not participate | Did not participate | #75 Cunningham Racing | #00 Full Time Racing | Results |
| Steve Millen Jeremy Dale | John Fergus | |||||
| 18 | Lime Rock | Did not participate | Did not participate | #75 Cunningham Racing | #00 Full Time Racing | Results |
| Steve Millen | John Fergus | |||||
| 19 | Del Mar | #99 All American Racers | #49 Comptech Racing | #9 Roush Racing | #95 Leitzinger Racing | Results |
| Juan Manuel Fangio II | Parker Johnstone | Robby Gordon | Bob Leitzinger |
| Place | Driver | Entrant | Total |
|---|---|---|---|
| 1 | Geoff Brabham | Nissan Performance Technology | 175 |
| 2 | Chip Robinson | Nissan Performance Technology | 170 |
| 3 | Davy Jones | Bud Light Jaguar Racing | 158 |
| 4 | Wayne Taylor | MTI Racing | 117 |
| 5 | Juan Manuel Fangio II | All American Racers | 107 |
| 6 | Raul Boesel | Bud Light Jaguar Racing | 72 |
| 7 | Tom Kendall | Jim Miller Racing MTI Racing | 69 |
| 8 | Brian Bonner | Tom Milner Racing | 54 |
| 9 | Bernd Schneider | 49 | |
| 10 | Derek Daly | Nissan Performance Technology | 48 |
| 11 | Henri Pescarolo | 44 | |
| 12 | Frank Jelinski | 43 | |
| 13 | Rocky Moran | All American Racers | 41 |
| 14 | Jim Adams | Dyson Racing Hotchkis Racing | 40 |
| 15 | James Weaver | Dyson Racing John Shapiro Racing | 36 |
| 16 | Chris Cord | Dyson Racing Hotchkis Racing | 32 |
| 17 | Scott Sharp | Tom Milner Racing | 30 |
| 18= | Giampiero Moretti | Momo-Gebhardt Racing | 29 |
| Jeff Purner | Tom Milner Racing | 29 | |
| 20 | Bob Earl | Nissan Performance Technology | 28 |
| etc. | |||