2013 Grand Prix motorcycle racing season

The 2013 Grand Prix motorcycle racing season was the 65th Road racing World Championship season. Jorge Lorenzo started the season as the defending World Champion, while Honda was the defending Manufacturers' Champion. Moto2 champion Marc Márquez joined the MotoGP grid with Repsol Honda and Moto3 champion Sandro Cortese entered Moto2, with Intact GP.

The three championships were each won by Spanish riders, with Márquez winning in MotoGP,Pol Espargaró winning in Moto2, and Maverick Viñales winning in Moto3. Spanish riders dominated the season overall, with 47 of the 52 races across all classes won by a Spanish rider. Of the five non-Spanish victories, three came from Moto2 championship runner-up Scott Redding, and one each from Moto2 front-runner Mika Kallio – his first in the class, in the Czech Republic – and MotoGP rider Valentino Rossi, who took his first premier class victory since 2010 at the Dutch TT.

In the premier MotoGP class, Lorenzo, along with Repsol Honda team-mates Marc Márquez and Dani Pedrosa battled it out for most of the season in regards to the championship battle. Lorenzo won the opening race of the season in Qatar, before rookie Márquez became the youngest premier class winner, as he claimed victory in the inaugural Grand Prix of the Americas in Texas. Pedrosa took back-to-back victories at Jerez – where Márquez and Lorenzo battled for second place, clashing at the final corner – and Le Mans, before Lorenzo did likewise at Mugello, and Catalunya; at the former, Márquez retired from the race after crashing out of second place. At Assen, Lorenzo crashed during free practice and fractured his collarbone, and after emergency surgery and initial reports that he would not take part for the rest of the weekend, he competed in the race and finished fifth. Márquez and Pedrosa finished second and fourth respectively, as Valentino Rossi took his first race victory since 2010. Márquez then won the next four races, starting at the Sachsenring, where both Lorenzo and Pedrosa were sidelined with injuries; Lorenzo with a recurrence of his Assen injury after crashing in free practice once again, while Pedrosa was ruled out with low blood pressure, stemming from a separate incident.

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