| 1 | | Audi Sport North America (D) | | Audi | R10 TDI | | Audi | LMP1 |
| 1T | Capello / Kristensen / McNish | Audi Sport North America (D) | | Audi | R10 TDI | | Audi | LMP1 |
| 2 | Biela / Pirro / Werner | Audi Sport North America (D) | | Audi | R10 TDI | | Audi | LMP1 |
| 3 | Fellows / O'Connell / Magnussen | Corvette Racing (USA) | | Chevrolet | Corvette C6 | .R Z06 | Chevrolet | GT1 |
| 4 | Gavin / Beretta / Papis | Corvette Racing (USA) | | Chevrolet | Corvette C6 | .R Z06 | Chevrolet | GT1 |
| 6 | Maassen / Collard / Briscoe | Penske Racing (USA) | Roger Penske | Porsche | RS Spyder | Evo | Porsche | LMP2 |
| 7 | Bernhard / Dumas / Castroneves | Penske Racing (USA) | Roger Penske | Porsche | RS Spyder | Evo | Porsche | LMP2 |
| 8 | Devlin / Bach / Matos | BK Motorsports | | Lola | B07/40 | -46 | Mazda | LMP2 |
| 9 | Brabham / Johansson / Dayton | Highcroft Racing (USA) | Duncan Dayton | Acura | ARX-01 | a | Acura | LMP2 |
| 10 | Da Silva / Collin / Hermann | Konrad Motorsport | | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 12 | McMurry / Willman / Lewis | Autocon Motorsports (USA) | | Lola | EX257 | | AER | LMP1 |
| 15 | Fernandez / Diaz / *Martinez | Lowe's Fernandez Racing | | Lola | B06/40 | -43 | Acura | LMP2 |
| 16 | Wallace / Leitzinger / Lally | Dyson Racing Team (USA) | Rob Dyson | Porsche | RS Spyder | Evo | Porsche | LMP2 |
| 18 | Kelleners / Milner / Rahal | Rahal Letterman Racing | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 20 | Dyson / Smith | Dyson Racing Team (USA) | Rob Dyson | Porsche | RS Spyder | Evo | Porsche | LMP2 |
| 21 | Hand / Auberlen / Kimber-Smith | Panoz Team PTG (USA) | Tom Milner | Panoz | Esperante | GTLM | Ford | GT2 |
| 22 | Maxwell / Sellers / Smith | Panoz Team PTG (USA) | Tom Milner | Panoz | Esperante | GTLM | Ford | GT2 |
| 24 | Macari / Aucott / Wilson | JMB Racing (MC) | | Ferrari | F430 | GTC | Ferrari | GT2 |
| 26 | Franchitti / Kanaan / Herta | Andretti Green Racing, Inc. (USA) | | Acura | ARX-01 | a | Acura | LMP2 |
| 27 | Theys / Lienhard / van de Poele | Horag Racing (CH) | | Lola | B05/40 | -41 | Judd | LMP2 |
| 31 | Enge / Bergmeister / *Gidley | Petersen White Lightning | | Ferrari | F430 | GTC | Ferrari | GT2 |
| 32 | Aguas / Lopez / Mediani | Corsa/White Lightning | | Ferrari | F430 | GTC | Ferrari | GT2 |
| 37 | Berry / Field / Field | Intersport Racing | | Creation | CA06/H | | Judd | LMP1 |
| 44 | Law / Neiman / Pechnik | Flying Lizard Motorsports (USA) | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 45 | Bergmeister / Van Overbeek / Lieb | Flying Lizard Motorsports (USA) | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 53 | Luyendyk, Jr. / Robertson / Robertson | Robertson Racing, LLC (USA) | | Panoz | Esperante | GTLM | Ford | GT2 |
| 54 | Basseng / Pappas / Borcheller | Team Trans Sport Racing | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 61 | Jönsson / Braun / Krohn | Risi Competizione (USA) | | Ferrari | F430 | GTC | Ferrari | GT2 |
| 62 | Melo / Mowlem / Salo | Risi Competizione (USA) | | Ferrari | F430 | GTC | Ferrari | GT2 |
| 63 | Garcia / Turner / Halliday | Team Modena (GB) | | Aston Martin | DBR9 | | Aston Martin | GT1 |
| 71 | Henzler / Liddell / Long | Tafel Racing | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 73 | Farnbacher / Tafel / James | Tafel Racing | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 77 | Konôpka / McCormick / Casadei | Autoracing Club Bratislava | | Porsche | 996 GT3-R | | Porsche | GT2 |
| 85 | Werner / Ehret / Nielsen | FarnbacherLoles Motorsports | | Porsche | 997 GT3 RSR | | Porsche | GT2 |
| 86 | Kox / Janiš | Spyker Squadron (NL) | | Spyker | C8 Spyder GT2R | | Audi | GT2 |