2018 San Marino and Rimini Riviera motorcycle Grand Prix

The 2018 San Marino and Rimini Riviera motorcycle Grand Prix was the thirteenth round of the 2018 MotoGP season. It was held at the Misano World Circuit Marco Simoncelli in Misano Adriatico on 9 September 2018.

Moto2

 * Romano Fenati was excluded from the race for grabbing Stefano Manzi's brake lever.

Moto3

 * Philipp Öttl suffered a concussion following a crash in qualifying and withdrew from the event.