The 2008 Grand Prix motorcycle racing season was the 60th Road Racing World Championship season.
The MotoGP class opened with the historic Qatar Grand Prix, the first night race held in the World Championship history. The race was won by Ducati's Casey Stoner ahead of rookie Jorge Lorenzo, who started on pole in the first race in the top class, and Dani Pedrosa.
In Spain Pedrosa won his first race of the year, ahead of Rossi and Lorenzo, while Stoner struggled with technical problems on his bike and finished 11th after twice going out on the gravel. At the Portugal GP, Lorenzo started on pole and won his first MotoGP race, ahead of Pedrosa and Rossi.
In China Rossi took his first win of the season and the first of three consecutive first places, after a weekend dominated by rain and cold temperatures; he then won in France and in front of his home crowd in Italy.
Stoner won the three consecutive races in Britain, the Netherlands and Germany, also obtaining pole position and the fastest lap in all three.
The United States race at Laguna Seca was the biggest turning point of the season. Before the race Stoner trailed Rossi on the standings by only 20 points. The Australian took pole position and started the race in first position. However, Rossi passed Stoner in the middle on the first lap, and Stoner could never make a decisive pass, and he stayed behind until the 24th lap, where he fell at the last corner. He re-mounted, but finished in second place while Rossi caught the first of five consecutive wins. In the next two races, Czech Republic and San Marino, Stoner fell off while leading from Rossi, who then won both times.