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	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	Joest Racing	49
10	Derek Daly	Nissan Performance Technology	48
11	Henri Pescarolo	Joest Racing	44
12	Frank Jelinski	Joest Racing	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.

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• World Sports Racing Prototypes – 1991 IMSA GT Championship results