1981 IMSA GT Championship
The 1981 Camel GT Championship season was the 11th season of the IMSA GT Championship auto racing series. It was a series for GTX class Group 5 cars and GTO and GTU class Grand tourer cars. It began January 31, 1981, and ended November 29, 1981, after sixteen rounds.
Schedule
The GTU class did not participate with the GTX and GTO classes in shorter events, instead holding their own separate event which included touring car competitors from the IMSA Champion Spark Plug Challenge, but did not race for points in the IMSA GT Championship. Races marked with All had all classes on track at the same time.| Rnd | Race | Length | Class | Circuit | Date |
| 1 | 24 Hour Pepsi Challenge | 24 Hours | All | Daytona International Speedway | January 31 February 1 |
| 2 | Coca-Cola 12 Hours of Sebring | 12 Hours | All | Sebring International Raceway | March 21 |
| 3 | Road Atlanta Grand Prix | 45 Minutes | GTU | Road Atlanta | April 12 |
| 3 | Road Atlanta Grand Prix | 100 Miles | GTX/GTO | Road Atlanta | April 12 |
| 4 | Los Angeles Times/Toyota Grand Prix | 6 Hours | All | Riverside International Raceway | April 26 |
| 5 | Datsun Monterey Triple Crown | 45 Minutes | GTU | Laguna Seca Raceway | May 3 |
| 5 | Datsun Monterey Triple Crown | 100 Miles | GTX/GTO | Laguna Seca Raceway | May 3 |
| 6 | Coca-Cola 400 | 45 Minutes | GTU | Lime Rock Park | May 24 |
| 6 | Coca-Cola 400 | 200 Miles | GTX/GTO | Lime Rock Park | May 24 |
| 7 | Red Roof Inns GT 200 | 200 Miles | All | Mid-Ohio Sports Car Course | May 31 |
| 8 | Pepsi Grand Prix | 200 km | All | Brainerd International Raceway | June 14 |
| 9 | Paul Revere 250 | 250 Miles | All | Daytona International Speedway | July 5 |
| 10 | Datsun California Grand Prix | 100 Miles | GTX/GTO | Sears Point Raceway | July 26 |
| 10 | Datsun California Grand Prix | 75 Miles | GTU | Sears Point Raceway | July 26 |
| 11 | G.I. Joe's/Camel Grand Prix | 45 Minutes | GTU | Portland International Raceway | August 2 |
| 11 | G.I. Joe's/Camel Grand Prix | 100 Miles | GTX/GTO | Portland International Raceway | August 2 |
| 12 | Molson 1000 | 6 Hours | All | Mosport Park | August 16 |
| 13 | Pabst 500 | 500 Miles | All | Road America | August 23 |
| 14 | Grand Prix of Road Atlanta | 45 Minutes | GTU | Road Atlanta | September 13 |
| 14 | Grand Prix of Road Atlanta | 150 Miles | GTX/GTO | Road Atlanta | September 13 |
| 15 | Kenwood Stereo 500 | 500 Miles | All | Pocono Raceway | September 27 |
| 16 | Camel GT 250 | 250 Miles | All | Daytona International Speedway | November 29 |