2008 Grand Prix motorcycle racing season Grands Prix Grands Prix

| Round | Date_ | Grand_Prix | Circuit | _125cc_winner | _250cc_winner | MotoGP_winner | Report |
|---|---|---|---|---|---|---|---|
| 14 | 14 September | Indianapolis Grand Prix | Indianapolis | Nicolás Terol | Race cancelled | Valentino Rossi | Report |
| 15 | 28 September | Japanese Grand Prix | Motegi | Stefan Bradl | Marco Simoncelli | Valentino Rossi | Report |
| 16 | 5 October | Australian Grand Prix | Phillip Island | Mike di Meglio | Marco Simoncelli | Casey Stoner | Report |
| 17 | 19 October | Malaysian Grand Prix | Sepang | Gábor Talmácsi | Álvaro Bautista | Valentino Rossi | Report |
| 18 | 26 October | Valencian Grand Prix | Valencia | Simone Corsi | Marco Simoncelli | Casey Stoner | Report |