The1971 IMSA GT Series season was the inaugural season of theIMSA GT Championshipauto racing series. It was forGrand Tourer-style racing cars which ran in the GTO and GTU classes, as well as formerTrans Am Series cars in the TO and TU classes. It began April 18, 1971, and ended November 21, 1971, after six rounds.
| Rnd | Race | Length | Circuit | Date |
|---|---|---|---|---|
| 1 | Danville 300 | 300 mi (480 km) | Virginia International Raceway | April 18 |
| 2 | Carter Hall GT | 200 mi (320 km) | Alabama International Motor Speedway | May 15 |
| 3 | Piedmont 3 Hour | 3 Hours | Charlotte Motor Speedway | May 23 |
| 4 | Bridgehampton 3 Hours | 3 Hours | Bridgehampton Race Circuit | June 27 |
| 5 | Summit Point 250 | 250 mi (400 km) | Summit Point Raceway | September 19 |
| 6 | 200 Miles of Daytona Beach | 200 mi (320 km) | Daytona International Speedway | November 21 |
Overall winner inbold.
| Rnd | Circuit | GTO Winning Team | GTU Winning Team | TO Winning Team | TU Winning Team | Results |
|---|---|---|---|---|---|---|
| GTO Winning Drivers | GTU Winning Drivers | TO Winning Drivers | TU Winning Drivers | |||
| 1 | Virginia | #57Corvette | #59 BrumosPorsche-Audi | #21Javelin | #71Opel | Results |
 Dave Heinz | Peter GreggHurley Haywood | Robert Hennig Richard Staples | Amos Johnson Roger Mandeville Bunny Diggett | |||
| 2 | Alabama | #57Corvette | #59 BrumosPorsche-Audi | #21Javelin | #21Mini | Results |
| Dave Heinz | Peter GreggHurley Haywood | Robert Hennig | Joe Richardson | |||
| 3 | Charlotte | #57Corvette | #59 BrumosPorsche-Audi | #21Javelin | #64Mini | Results |
| Dave Heinz Or Costanzo | Peter GreggHurley Haywood | Robert Hennig Bob Beasley | Anthony Milne Richard Stevens | |||
| 4 | Bridgehampton | #18 Es-Pa Racing | #59 BrumosPorsche-Audi | #84Camaro | #85Alfa Romeo | Results |
| Rodney Harris John Paul Sr. | Peter GreggHurley Haywood | George Lisberg Ray Cuomo | Walt Simendinger Bob Heiberg | |||
| 5 | Summit Point | #49Mustang | #59 BrumosPorsche-Audi | #42Camaro | #93 Jerry Walsh | Results |
| Lee McDonald Albert Pentrillo | Peter GreggHurley Haywood | Steve Ross | Jerry Walsh Lee Wiese | |||
| 6 | Daytona | #57Corvette | #34911 | #3Camaro | #112002 | Results |
| Don Yenko Dave Heinz | Bill Cuddy | Tom Nehl Jim Fitzgerald | Byron Morris Clint Abernethy |
Points are awarded to the top six in each class in the order of 9-6-4-3-2-1.
| Pos | Constructor | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Total |
|---|---|---|---|---|---|---|---|---|
| 1 | Chevrolet | 9 | 9 | 9 | 9 | 6 | 9 | 51 |
| 2 | Shelby | 4 | 9 | 13 |
| Pos | Constructor | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Total |
|---|---|---|---|---|---|---|---|---|
| 1 |  Porsche | 9 | 9 | 9 | 9 | 9 | 9 | 54 |
| 2 |  Austin-Healey | 1 | 1 | 1 | 3 | |||
| 3= | MG | 2 | 2 | |||||
| 3= |  Alfa Romeo | 2 | 2 | |||||
| 5 | Lotus | 1 | 1 |
| Pos | Constructor | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Total |
|---|---|---|---|---|---|---|---|---|
| 1 | Chevrolet | 6 | 6 | 9 | 9 | 9 | 39 | |
| 2 | AMC | 9 | 9 | 9 | 1 | 28 | ||
| 3 | Ford | 2 | 2 |
| Pos | Constructor | Rd 1 | Rd 2 | Rd 3 | Rd 4 | Rd 5 | Rd 6 | Total |
|---|---|---|---|---|---|---|---|---|
| 1 | Austin | 4 | 9 | 9 | 6 | 6 | 34 | |
| 2 | BMW | 6 | 4 | 9 | 19 | |||
| 3 | Ford | 3 | 3 | 9 | 4 | 19 | ||
| 4 | Alfa Romeo | 9 | 3 | 6 | 18 | |||
| 5 | Opel | 9 | 1 | 3 | 13 | |||
| 6 |  Datsun | 4 | 4 | 2 | 10 | |||
| 7 | Fiat | 6 | 2 | 8 | ||||
| 8 |  Saab | 3 | 3 | |||||
| 9 | Audi | 1 | 1 |
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