| 2 | Dalziel / Pla / Sharp | Tequila Patron ESM | Scott Sharp | Nissan | Onroak DPi | | Nissan | P |
| 3 | Magnussen / Rockenfeller / Garcia | Corvette Racing (USA) | Doug Fehan | Chevrolet | Corvette C7 | .R | Chevrolet | GTLM |
| 4 | Gavin / Milner / Fässler | Corvette Racing (USA) | Doug Fehan | Chevrolet | Corvette C7 | .R | Chevrolet | GTLM |
| 5 | Albuquerque / Barbosa / Fittipaldi | Mustang Sampling Racing | | Cadillac | DPi-V.R | | Cadillac | P |
| 6 | Cameron / Montoya / Pagenaud | Acura Team Penske (USA) | Roger Penske | Acura | ARX-05 | | Acura | P |
| 7 | Castroneves / Taylor / Rahal | Acura Team Penske (USA) | Roger Penske | Acura | ARX-05 | | Acura | P |
| 10 | van der Zande / Taylor / Hunter-Reay | Konica Minolta Cadillac DPi-V.R (USA) | Wayne Taylor | Cadillac | DPi-V.R | | Cadillac | P |
| 11 | Bortolotti / Breukers / Ineichen / Perera | GRT Grasser Racing Team (A) | | Lamborghini | Huracán | GT3 | Lamborghini | GTD |
| 14 | Frommenwiler / Baumann / Marcelli / Junqueira | 3GT Racing | | Lexus | RC F | GT3 | Lexus | GTD |
| 15 | Hawksworth / Farnbacher / Pruett / Heinemeier Hansson | 3GT Racing | | Lexus | RC F | GT3 | Lexus | GTD |
| 19 | Lenz / Engelhart / van Splunteren / Pérez Companc / Machiels | GRT Grasser Racing Team (A) | | Lamborghini | Huracán | GT3 | Lamborghini | GTD |
| 20 | Popow / Lux / Gaughan / Drumwright | BAR1 Motorsports | | Riley | Mk.30 | | Gibson | P |
| 22 | Lapierre / Derani / Van Overbeek | Tequila Patron ESM | Scott Sharp | Nissan | Onroak DPi | | Nissan | P |
| 23 | Alonso / Norris / Hanson | United Autosports (USA) | | Ligier | JS P217 | | Gibson | P |
| 24 | Farfus / Edwards / Catsburg / Krohn | BMW Team RLL (USA) | | BMW | M8 | GTE | BMW | GTLM |
| 25 | Sims / Eng / De Phillippi / Auberlen | BMW Team RLL (USA) | | BMW | M8 | GTE | BMW | GTLM |
| 29 | van der Linde / van der Linde / Mies / Schmidt | Montaplast by Land-Motorsport (D) | | Audi | R8 LMS | GT3 | Audi | GTD |
| 31 | Nasr / Conway / Middleton / Curran | Whelen Engineering Racing | | Cadillac | DPi-V.R | | Cadillac | P |
| 32 | Senna / di Resta / de Sadeleer / Owen | United Autosports (USA) | Richard Dean/Zak Brown | Ligier | JS P217 | | Gibson | P |
| 33 | Keating / Stolz / Bleekemolen / Christodoulou | Mercedes-AMG Team Riley Motorsports | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD |
| 37 | Frijns / Rosenqvist / Stroll / Juncadella | Jackie Chan DCR Jota (CHN) | Jackie Chan | Oreca | 07 | | Gibson | P |
| 38 | O'Ward / French / Masson / Miller | Performance Tech Motorsports | | Oreca | 07 | | Gibson | P |
| 44 | Lally / Davis / Winkelhock / Potter | Magnus Racing (USA) | | Audi | R8 LMS | GT3 | Audi | GTD |
| 48 | Miller / Sellers / Caldarelli / Snow | Paul Miller Racing (USA) | Paul Miller | Lamborghini | Huracán | GT3 | Lamborghini | GTD |
| 51 | Serra / Lamy / Lauda / Dalla Lana | Spirit of Race | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 52 | Yacaman / Saavedra / Gonzalez / Boulle | AFS/PR1 Mathiasen Motorsports | | Ligier | JS P217 | | Gibson | P |
| 54 | Braun / Dumas / Duval / Bennett | CORE autosport | Jon Bennett | Oreca | 07 | | Gibson | P |
| 55 | Bomarito / Tincknell / Pigot | Mazda Team Joest (D) | Reinhold Jöst | Mazda | RT24-P | | Mazda | P |
| 58 | Renauer / Jaminet / Long / Nielsen | Wright Motorsports | | Porsche | 991 GT3 R | | Porsche | GTD |
| 59 | Müller / Cairoli / Proczyk / Walls / Smith | Manthey-Racing | | Porsche | 991 GT3 R | | Porsche | GTD |
| 62 | Vilander / Calado / Rigon / Pier Guidi | Risi Competizione (USA) | Guiseppe Risi | Ferrari | 488 | GTE | Ferrari | GTLM |
| 63 | Balzan / Jeannette / Segal / MacNeil | Scuderia Corsa | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 64 | Bird / Bell / Montecalvo / Sweedler | Scuderia Corsa | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 66 | Hand / Bourdais / Müller | Ford Chip Ganassi Racing (USA) | Chip Ganassi | Ford | GT | LM GTE | Ford | GTLM |
| 67 | Westbrook / Briscoe / Dixon | Ford Chip Ganassi Racing (USA) | Chip Ganassi | Ford | GT | LM GTE | Ford | GTLM |
| 69 | Eversley / Rayhall / Gilsinger / Falb | HART | | Acura | NSX | GT3 | Acura | GTD |
| 71 | Perez / Spinelli / Koch / Foley | P1 Motorsports | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD |
| 73 | Pappas / Bergmeister / Siedler / Lindsey | Park Place Motorsports | | Porsche | 991 GT3 R | | Porsche | GTD |
| 75 | Habul / Jäger / Engel / Grenier | SunEnergy1 Racing | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD |
| 77 | Jarvis / Rast / Nunez | Mazda Team Joest (D) | Reinhold Jöst | Mazda | RT24-P | | Mazda | P |
| 78 | Brundle / Tung / Felix da Costa / Habsburg | Jackie Chan DCR Jota (CHN) | | Oreca | 07 | | Gibson | P |
| 82 | Molina / Griffin / Fuentes / Pérez de Lara / Creel | Risi Competizione | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 85 | Trummer / DeFrancesco / Cindric / Alon | JDC-Miller Motorsports | | Oreca | 07 | | Gibson | P |
| 86 | Parente / Legge / Allmendinger / Hindman | Michael Shank Racing w/ Curb-Agajanian (USA) | Michael Shank | Acura | NSX | GT3 | Acura | GTD |
| 90 | McMurry / Cheever / Vautier | Spirit of Daytona Racing | | Cadillac | DPi-V.R | | Cadillac | P |
| 93 | Ledogar / Farnbacher / Aschenbach / Marks | Michael Shank Racing w/ Curb-Agajanian (USA) | Michael Shank | Acura | NSX | GT3 | Acura | GTD |
| 96 | Lawrence / Klingmann / Tomczyk / Yount / Kvamme | Turner Motorsport | | BMW | M6 | F13 GT3 | BMW | GTD |
| 99 | Simpson / Menezes / Miller / Goikhberg | JDC-Miller Motorsports | | Oreca | 07 | | Gibson | P |
| 911 | Pilet / Tandy / Makowiecki | Porsche GT Team (USA) | Jon Bennett | Porsche | 991 RSR | II | Porsche | GTLM |
| 912 | Vanthoor / Bruni / Bamber | Porsche GT Team (USA) | Jon Bennett | Porsche | 991 RSR | II | Porsche | GTLM |