2021 Indianapolis Motor Speedway
Entry list
| Car # | Driver 1 | Team | Car | Class |
|---|---|---|---|---|
| 32 | Kyle Washington | GMG Racing | Porsche 911 GT3-R | SRO3 |
| 45 | Charlie Luck | Wright Motorsports | Porsche 911 GT3-R (991.2) | SRO3-M |
| 58 | CJ Moses | DXDT Racing | Mercedes-AMG GT3 | SRO3 |
| 70 | Brendan Iribe | inception racing | McLaren 720S GT3 | SRO3 |
| 88 | Jason Harward | Zelus Motorsports | Lamborghini Huracan GT3 | SRO3 |
| 101 | Memo Gidley | TKO Motorsports | Bentley Continental GT3 | SRO3 |
| 191 | Jeff Burton | Rearden Racing | Lamborghini Huracan GT3 | SRO3-M |
| 460 | Andy Wilzoch | Flying Lizard Motorsports | Porsche 911 GT3-R (991.2) | SRO3 |
| 8 | Elias Sabo | GMG Racing | Audi R8 LMS GT2 | GT2 |
| 2 | Jason Bell | GMG Racing | Aston Martin Vantage AMR GT4 | GT4 |
| 25 | Gray Newell | Heart of Racing Team | Aston Martin Vantage AMR GT4 | GT4 |
| 26 | Thomas Surgent | Prive Motorsports/ Topp Racing | McLaren 570S GT4 | GT4 |
| 39 | Chris Cagnazzi | RENNtech Motorsports | Mercedes-AMG GT4 | GT4 |
| 49 | Scott Noble | NOLASPORT | Porsche 718 Cayman GT4 Clubsport MR | GT4 |
| 60 | Matt Rivard | Dexter Racing | Ginetta 56 | GT4 |
| 76 | Alex Welch | ROTR Motorsport | Audi R8 LMS GT4 | GT4 |
| 79 | Christopher Gumprecht | RENNtech Motorsports | Mercedes-AMG GT4 | GT4 |
| 99 | Robb Holland | Rotek Racing | Ford Mustang GT4 | GT4 |
| 119 | Sean Quinlan | Stephen Cameron Racing | BMW M4 GT4 | GT4 |
| 888 | Sean Whalen | Zelus Motorsports | Aston Martin Vantage AMR GT4 | GT4 |