2021 Watkins Glen International
Entry list
| Car # | Driver 1 | Driver 2 | Team | Car | Class |
|---|---|---|---|---|---|
| 2 | Jason Bell | Andrew Davis | GMG Racing | Aston Martin Vantage AMR GT4 | PA |
| 5 | Michael McAleenan | Dan Rogers | Motorsport USA | McLaren 570S GT4 | AM |
| 7 | Sam Owen | Sean Gibbons | NolaSport with OGH | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 09 | Paul Kiebler | Mikel Miller | Automatic Racing | Aston Martin Vantage AMR GT4 | AM |
| 11 | Stevan McAleer | Toby Grahovec | Classic BMW | BMW M4 GT4 | SL |
| 15 | Bryan Putt | Kenton Koch | BSPort Racing | Aston Martin Vantage AMR GT4 | PA |
| 16 | John Allen | Kris Wilson | Capstone Motorsports | Mercedes-AMG GT4 | AM |
| 18 | Matt Forbush | Damon Surzyshyn | Forbush Performance | Toyota GR Supra GT4 | AM |
| 22 | Tim Barber | Cole Ciraulo | CCR Racing/Team TFB | BMW M4 GT4 | SL |
| 24 | Gray Newell | Ian James | Heart of Racing Team | Aston Martin Vantage AMR GT4 | PA |
| 34 | James Walker | Bill Auberlen | BimmerWorld Racing | BMW M4 GT4 | PA |
| 35 | Michai Stephens | Marco Kacic | Conquest Racing West | Mercedes-AMG GT4 | SL |
| 36 | James Clay | Nick Galante | BimmerWorld Racing | BMW M4 GT4 | PA |
| 37 | Charlie Belluardo | Trent Hindman | RS1 | Porsche 718 Cayman GT4 CLUBSPORT MR | PA |
| 46 | David Walker | Russell Walker | NOLASPORT | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 47 | Matt Travis | Jason Hart | NOLASPORT | Porsche 718 Cayman GT4 CLUBSPORT MR | PA |
| 48 | Dominic Starkweather | Jason Alexandridis | NOLASPORT | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 50 | Ross Chouest | Aaron Povoledo | 3R Povoledo Racing | Aston Martin Vantage AMR GT4 | PA |
| 52 | Tom Capizzi | John Capestro-Dubets | Auto Technic Racing | BMW M4 GT4 | PA |
| 59 | Paul Terry | Owen Trinkler | WR Racing | Aston Martin Vantage AMR GT4 | PA |
| 062 | Ryan Dexter | Warren Dexter | Dexter Racing | Aston Martin Vantage AMR GT4 | SL |
| 66 | Derek DeBoer | Spencer Pumpelly | TRG - The Racers Group | Porsche 718 Cayman GT4 CLUBSPORT MR | PA |
| 68 | John Geesbreght | Kevin Conway | Smooge Racing | Toyota GR Supra GT4 | AM |
| 71 | Nicolai Elghanayan | Mads Siljehaug | Marco Polo Motorsports | KTM X-BOW GT4 | SL |
| 72 | Kenny Murillo | Christian Szymczak | Murillo Racing | Mercedes-AMG GT4 | SL |
| 79 | Christopher Gumprecht | Kyle Marcelli | RENNtech Motorsports | Mercedes-AMG GT4 | PA |
| 94 | Jon Miller | Chandler Hull | BimmerWorld Racing | BMW M4 GT4 | SL |
| 98 | Paul Sparta | Al Carter | Random Vandals Racing | BMW M4 GT4 | AM |
| 111 | Todd Clarke | Ty Clarke | Motorsport USA | McLaren 570S GT4 | AM |
| 119 | Sean Quinlan | Gregory Liefooghe | Stephen Cameron Racing | BMW M4 GT4 | PA |
| 450 | Daren Jorgensen | Brett Strom | RHC Jorgensen/Strom | BMW M4 GT4 | PA |
| 619 | Alain Stad | Thomas Merrill | Stephen Cameron Racing | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 930 | Sameer Gandhi | Tom Dyer | CarBahn | Audi R8 LMS GT4 | PA |