2008 Full-Time Entrants[]
| No | Driver | Sponsor(s) | Team | Chassis | Engine | Tires |
|---|---|---|---|---|---|---|
| 02 | Justin Wilson (R) (GBR) | McDonald's | Newman/Haas/Lanigan Racing | Dallara | Honda | Firestone |
| 2 | A.J. Foyt IV (USA) | Lilly Diabetes | Vision Racing | Dallara | Honda | Firestone |
| 3 | Hélio Castroneves (BRA) | Marlboro (unbranded) | Team Penske | Dallara | Honda | Firestone |
| 4 | Vitor Meira (BRA) | National Guard/Delphi | Panther Racing | Dallara | Honda | Firestone |
| 5 | Oriol Servià (R) (ESP) | Plantronics | KV Racing Technology | Dallara | Honda | Firestone |
| 06 | Graham Rahal (R) (USA) | Hole in the Wall Camps | Newman/Haas/Lanigan Racing | Dallara | Honda | Firestone |
| 6 | Ryan Briscoe (AUS) | Marlboro (unbranded) | Team Penske | Dallara | Honda | Firestone |
| 7 | Danica Patrick (USA) | Motorola | Andretti Green Racing | Dallara | Honda | Firestone |
| 8 | Will Power (R) (AUS) | Aussie Vineyards | KV Racing Technology | Dallara | Honda | Firestone |
| 9 | Scott Dixon (NZL) | Target | Chip Ganassi Racing | Dallara | Honda | Firestone |
| 10 | Dan Wheldon (GBR) | Target | Chip Ganassi Racing | Dallara | Honda | Firestone |
| 11 | Tony Kanaan (BRA) | 7-Eleven | Andretti Green Racing | Dallara | Honda | Firestone |
| 14 | Darren Manning (GBR) | ABC Supply Company | A.J. Foyt Enterprises | Dallara | Honda | Firestone |
| 15 | Buddy Rice (USA) | Roll Coater | Dreyer & Reinbold Racing | Dallara | Honda | Firestone |
| 17 | Ryan Hunter-Reay (USA) | Ethanol Promotion and Information Council | Rahal Letterman Racing | Dallara | Honda | Firestone |
| 18 | Bruno Junqueira (BRA) | Z-Line Designs | Dale Coyne Racing | Dallara | Honda | Firestone |
| 19 | Mario Moraes (R) (BRA) | Sonny's Real Pit Bar-B-Q | Dale Coyne Racing | Dallara | Honda | Firestone |
| 20 | Ed Carpenter (USA) | Menards | Vision Racing | Dallara | Honda | Firestone |
| 24 | Jay Howard (GBR) | Unsponsored | Roth Racing | Dallara | Honda | Firestone |
| 25 | Marty Roth (CAN) | Cirrus Design | Roth Racing | Dallara | Honda | Firestone |
| 26 | Marco Andretti (USA) | NYSE/Meijer/Gillette Fusion/ Blockbuster Indiana Jones and the Kingdom of the Crystal Skull |
Andretti Green Racing | Dallara | Honda | Firestone |
| 27 | Hideki Mutoh (R) (JPN) | Panasonic/Formula Dream | Andretti Green Racing | Dallara | Honda | Firestone |
| 33 | E.J. Viso (R) (VEN) | PDVSA | HVM Racing | Dallara | Honda | Firestone |
| 34 | Jaime Camara (R) (BRA) | Sangari | Conquest Racing | Dallara | Honda | Firestone |
| 36 | Enrique Bernoldi (R) (BRA) | Sangari | Conquest Racing | Dallara | Honda | Firestone |
| 96 | Mario Domínguez (R) (MEX) | Mexico City Tourism Board | Pacific Coast Motorsports | Dallara | Honda | Firestone |