| Flag: | USA |
| 2021 Indianapolis 8 Hours | |
| Round No: | 2 |
| Season No: | 3 |
| Year: | 2021 Intercontinental GT Challenge |
| Track Map: | File:Indianapolis IndycarGP.svg |
| Date: | 17 October |
| Location: | Speedway, Indiana, United States |
| Circuit: | Indianapolis Motor Speedway |
| Race1 Laps: | 265 |
| Race1 Dist: | 636.88miles |
| Pole1: |  No. 51 AF Corse (driver for session: Alessandro Pier Guidi) |
| Pole1 Team: | AF Corse - Francorchamps Motors |
| Pole1 Time: | 1:33.456 |
| Winner1: |  Christopher HaasePatric Niederhauser Markus Winkelhock |
| Winner1 Team: |  Audi Sport Team Saintéloc |
| Winner1 Time: | 8:00:59.768 |
The 2021 Indianapolis 8 Hours was an endurance race held on 17 October 2021[1] at the Indianapolis Motor Speedway in Speedway, in Indiana, United States. The event was open to cars in GT classes, namely GT3 and GT4. It was the second running of the Indianapolis 8 Hour. It was also the second leg of the 2021 Intercontinental GT Challenge and the seventh and final race of the 2021 GT World Challenge America. The GT World Challenge America results were determined by the race results after three hours instead of the full eight hours.
The race was run on the SCCA Runoffs layout, not the INDYCAR Grand Prix layout as was done the previous year, as it was made necessary as a result of kerbing damage in the Turn 5-6 chicane during the Verizon 200 NASCAR-INDYCAR meeting. The Runoffs course utilised the old Formula One course with the newer Snake Pit section. Web site: Indianapolis Wednesday Notebook – Sportscar365.
Cars competed in the following two GT classes.
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Pole positions in each class are denoted in bold.
| Class | Team | |||||
|---|---|---|---|---|---|---|
| 1 | GT3 Pro | 51 | AF Corse - Francorchamps Motors | 1:34.916 | 1:33.456 | 1 |
| 2 | GT3 Pro | 25 | Audi Sport Team Saintéloc | 1:34.728 | 1:33.514 | 2 |
| 3 | GT3 Pro | 99 |  Mercedes-AMG Team Craft-Bamboo Racing | 1:34.444 | 1:33.515 | 3 |
| 4 | GT3 Pro | 71 | AF Corse - Francorchamps Motors | 1:34.706 | 1:33.556 | 4 |
| 5 | GT3 Pro | 32 |  Audi Sport Team WRT | 1:34.826 | 1:33.817 | 5 |
| 6 | GT3 Pro | 37 | Audi Sport Team WRT | 1:34.562 | 1:33.845 | 6 |
| 7 | GT3 Silver | 33 |  Winward Racing | 1:35.168 | 1:34.013 | 7 |
| 8 | GT3 Pro | 89 | Mercedes-AMG Team AKKA ASP | 1:34.942 | 1:34.130 | 8 |
| 9 | GT3 Silver | 20 | Wright Motorsports | 1:35.885 | 1:34.197 | 9 |
| 10 | GT3 Pro/Am | 75 |  SunEnergy1 Racing | 1:35.791 | 1:34.232 | 10 |
| 11 | GT3 Pro | 3 | K-Pax Racing | 1:34.641 | 1:34.376 | 11 |
| 12 | GT3 Silver | 26 | Saintéloc Racing | 1:35.503 | 1:34.418 | 12 |
| 13 | GT3 Silver | 93 | Racers Edge Motorsports | 1:35.775 | 1:34.456 | 13 |
| 14 | GT3 Pro | 6 | K-Pax Racing | 1:35.664 | 1:34.903 | 14 |
| 15 | GT3 Pro | 59 | Crucial Motorsports | 1:34.730 | No Time | 15 |
| 16 | GT3 Silver | 77 |  Richard Mille - Compass Racing | 1:36.045 | 16 | |
| 17 | GT3 Pro/Am | 70 |  Inception Racing with Optimum Motorsport | 1:36.152 | 17 | |
| 18 | GT3 Pro/Am | 19 | CrowdStrike/ DXDT Racing | 1:36.395 | 18 | |
| 19 | GT3 Pro/Am | 34 | GMG Racing | 1:36.523 | 19 | |
| 20 | GT3 Pro/Am | 88 | Zelus Motorsports | 1:36.764 | 20 | |
| 21 | GT3 Pro/Am | 04 | CrowdStrike/ DXDT Racing | 1:37.044 | 21 | |
| 22 | GT3 Pro/Am | 63 | CrowdStrike/ DXDT Racing | 1:37.199 | 22 | |
| 23 | GT3 Pro/Am | 10 | TR3 Racing | 1:37.218 | 23 | |
| 24 | GT3 Pro/Am | 91 | Rearden Racing | 1:37.429 | 24 | |
| 25 | GT3 Am | 61 | AF Corse | 1:37.537 | 25 | |
| 26 | GT3 Pro/Am | 16 |  EBM Giga Racing | 1:41.637 | 26 | |
| 27 | GT4 Am | 68 | TGR Smooge Racing | 1:43.069 | 39 | |
| 28 | GT4 Pro/Am | 2 | GMG Racing | 1:43.516 | 27 | |
| 29 | GT4 Silver | 36 | Bimmerworld Racing | 1:43.748 | 28 | |
| 30 | GT4 Pro/Am | 119 | Stephen Cameron Racing | 1:44.093 | 29 | |
| 31 | GT4 Silver | 82 | Bimmerworld Racing | 1:44.240 | 30 | |
| 32 | GT4 Pro/Am | 47 | Nolasport | 1:44.252 | 31 | |
| 33 | GT4 Pro/Am | 8 | GMG Racing | 1:44.414 | 32 | |
| 34 | GT4 Pro/Am | 98 | Random Vandals Racing | 1:44.649 | 33 | |
| 35 | GT4 Silver | 111 | Classic BMW | 1:44.651 | 34 | |
| 36 | GT4 Pro/Am | 66 | TRG - The Racers Group | 1:44.740 | 35 | |
| 37 | GT4 Pro/Am | 54 | Black Swan Racing | 1:44.859 | 36 | |
| 38 | GT4 Am | 7 | Nolasport with OGH | 1:46.189 | 37 | |
| 39 | GT4 Am | 09 | Automatic Racing | 1:44.608 | 38 | |
| 40 | GT3 Pro | 96 | Turner Motorsport | No Time | ||
| 41 | GT3 Pro/Am | 12 | Ian Lacy Racing with G3 Racing | No Time | ||
Class winners denoted with bold and .
| Class | Team / Entrant | Drivers | Car | Laps | Time/Retired | ||
|---|---|---|---|---|---|---|---|
| 1 | GT3 Pro | 25 | Audi Sport Team Saintéloc | Christopher Haase Patric Niederhauser Markus Winkelhock | Audi R8 LMS Evo | 265 | 8:00:59.768 |
| 2 | GT3 Pro | 89 | Mercedes-AMG Team AKKA ASP |  Timur Boguslavskiy Daniel Juncadella Raffaele Marciello | Mercedes-AMG GT3 Evo | 265 | +11.958 |
| 3 | GT3 Pro | 3 | K-Pax Racing | Mirko Bortolotti Andrea Caldarelli Jordan Pepper | Lamborghini Huracán GT3 Evo | 265 | +22.853 |
| 4 | GT3 Pro | 51 | AF Corse - Francorchamps Motors | Côme Ledogar Nicklas Nielsen Alessandro Pier Guidi | Ferrari 488 GT3 Evo 2020 | 265 | +49.508 |
| 5 | GT3 Pro | 32 | Audi Sport Team WRT | Christopher Mies Dries Vanthoor Charles Weerts | Audi R8 LMS Evo | 265 | +51.655 |
| 6 | GT3 Silver | 77 | Richard Mille - Compass Racing | Mario Farnbacher Ashton Harrison Matt McMurry | Acura NSX GT3 Evo | 265 | +59.815 |
| 7 | GT3 Silver | 26 | Saintéloc Racing | Nicolas Baert Lucas Légeret Aurélien Panis | Audi R8 LMS Evo | 265 | +1:23.937 |
| 8 | GT3 Silver | 93 | Racers Edge Motorsports | Jacob Abel Dakota Dickerson Taylor Hagler | Acura NSX GT3 Evo | 264 | +1 Lap |
| 9 | GT3 Pro | 6 | K-Pax Racing | Corey Lewis Marco Mapelli Giovanni Venturini | Lamborghini Huracán GT3 Evo | 264 | +1 Lap |
| 10 | GT3 Pro-Am | 75 | SunEnergy1 Racing | Mikaël Grenier Kenny Habul Martin Konrad | Mercedes-AMG GT3 Evo | 261 | +4 Laps |
| 11 | GT3 Pro-Am | 34 | GMG Racing |  Dennis Olsen James Sofronas Kyle Washington | Porsche 911 GT3 R | 261 | +4 Laps |
| 12 | GT3 Pro | 37 | Audi Sport Team WRT | Mattia Drudi Robin FrijnsNico Müller | Audi R8 LMS Evo | 261 | +4 Laps |
| 13 | GT3 Pro-Am | 10 | TR3 Racing | Giacomo Altoè John Megrue Bill Sweedler | Lamborghini Huracán GT3 Evo | 259 | +6 Laps |
| 14 | GT3 Pro-Am | 63 | CrowdStrike/DXDT Racing | David Askew Ryan Dalziel Scott Smithson | Mercedes-AMG GT3 Evo | 256 | +9 Laps |
| 15 | GT3 Pro-Am | 70 | Inception Racing with Optimum Motorsport | Brendan Iribe Kevin Madsen Ollie Millroy | McLaren 720S GT3 | 255 | +10 Laps |
| 16 | GT3 Am | 61 | AF Corse | Conrad Grunewald Mark Kvamme Jean-Claude Saada | Ferrari 488 GT3 Evo 2020 | 254 | +11 Laps |
| 17 | GT4 Silver | 36 | Bimmerworld Racing | Bill Auberlen James Clay Chandler Hull | BMW M4 GT4 | 247 | +18 Laps |
| 18 | GT4 Pro-Am | 119 | Stephen Cameron Racing | Guy Cosmo Tom Dyer Sean Quinlan | BMW M4 GT4 | 247 | +18 Laps |
| 19 | GT4 Pro-Am | 54 | Black Swan Racing | Jeroen Bleekemolen Sebastiaan Bleekemolen Tim Pappas | Porsche 718 Cayman GT4 Clubsport | 247 | +18 Laps |
| 20 | GT4 Silver | 82 | Bimmerworld Racing | Nick Galante Devin Jones James Walker | BMW M4 GT4 | 246 | +19 Laps |
| 21 | GT4 Pro-Am | 66 | TRG - The Racer's Group | Derek DeBoer Andy Lally Spencer Pumpelly | Porsche 718 Cayman GT4 Clubsport | 246 | +19 Laps |
| 22 | GT4 Pro-Am | 8 | GMG Racing | Andy Lee Joel Miller Elias Sabo | Audi R8 LMS GT4 Evo | 244 | +21 Laps |
| 23 | GT4 Silver | 111 | Classic BMW | John Capestro-DuBets Alex Filsinger Dominic Starkweather | BMW M4 GT4 | 223 | +42 Laps |
| 24 | GT3 Pro-Am | 04 | CrowdStrike/DXDT Racing | Colin Braun Ben Keating George Kurtz | Mercedes-AMG GT3 Evo | 212 | +53 Laps |
| 25 | GT4 Am | 09 | Automatic Racing | Jonathan Branam Paul Kiebler Mikel Miller | Aston Martin Vantage AMR GT4 | 212 | +53 Laps |
| 26 | GT4 Am | 7 | Nolasport with OGH | Sean Gibbons Pippa Mann Sam Owens | Porsche 718 Cayman GT4 Clubsport | 200 | +65 Laps |
| 27 | GT4 Pro-Am | 47 | Nolasport | Jason Hart Colin Noble Matt Travis | Porsche 718 Cayman GT4 Clubsport | 196 | +69 Laps |
| NC | GT3 Pro | 99 | Mercedes-AMG Team Craft-Bamboo Racing | Maro Engel Jules Gounon Luca Stolz | Mercedes-AMG GT3 Evo | 243 | Retired |
| NC | GT3 Pro | 59 | Crucial Motorsports | Ben Barnicoat Robert Bell Paul Holton | McLaren 720S GT3 | 242 | Retired |
| NC | GT3 Pro | 71 | AF Corse - Francorchamps Motors | Antonio Fuoco Callum Ilott Davide Rigon | Ferrari 488 GT3 Evo 2020 | 237 | Retired |
| NC | GT4 Pro-Am | 98 | Random Vandals Racing | Al Carter Conor Daly Paul Sparta | BMW M4 GT4 | 169 | Retired |
| NC | GT3 Pro-Am | 16 | EBM Giga Racing | Nick Boulle Adrian D'Silva Jeffery Kingsley | Porsche 911 GT3 R | 144 | Retired |
| NC | GT3 Silver | 20 | Wright Motorsports | Jan Heylen Fred Poordad Max Root | Porsche 911 GT3 R | 144 | Retired |
| NC | GT4 Pro-Am | 2 | GMG Racing | Jason Bell Andrew Davis Trent Hindman | Aston Martin Vantage AMR GT4 | 134 | Retired |
| NC | GT4 Am | 68 | TGR Smooge Racing | Kevin Conway John Geesbreght Jack Hawksworth | Toyota GR Supra GT4 | 120 | Retired |
| NC | GT3 Pro-Am | 91 | Rearden Racing | Jeff Burton Vesko Kozarov | Lamborghini Huracán GT3 Evo | 103 | Retired |
| NC | GT3 Pro-Am | 19 | CrowdStrike/DXDT Racing | Michael Cooper Thomas Merrill Erin Vogel | Mercedes-AMG GT3 Evo | 62 | Retired |
| NC | GT3 Silver | 33 | Winward Racing | Marvin Dienst Philip Ellis Russell Ward | Mercedes-AMG GT3 Evo | 62 | Retired |
| NC | GT3 Pro-Am | 88 | Zelus Motorsports | Jason Harward Madison Snow | Lamborghini Huracán GT3 Evo | 100 | |
| Results | |||||||
