The 2017 Moto3 season was a part of the 69th F.I.M. Road Racing World Championship season. Brad Binder was the reigning series champion but did not defend his title as he joined the series' intermediate class, Moto2.
Calendar
The following Grands Prix were scheduled to take place in 2017.
The British Grand Prix was scheduled to move from Silverstone to the new Circuit of Wales, but construction on the new track had not commenced. The two circuits reached a deal that would have seen Silverstone continue to host the British Grand Prix in 2017, with an option to host the 2018 race.
Teams and riders
A provisional list of team entrants for 2017 was released on 26 October 2016.
Romano Fenati, who was fired from Valentino Rossi's team Sky Racing Team VR46 midway through last season due to behavioral issues, landed a ride with Snipers Team for the 2017 season.
John McPhee moved to a brand new UK-based team backed by Dorna, GB Team with Jakub Kornfeil replacing him at Peugeot MC Saxoprint.
María Herrera has moved to AGR Team, who decided to field one bike in Moto3. Herrera previously rode for her own team in 2016 after taking over the assets of Team Laglisse.
After spending the previous season as a replacement rider for Peugeot MC Saxoprint, Albert Arenas makes his full season debut with Aspar Team Moto3, filling the seat vacated by Jorge Martin.
After spending the previous season in Moto3, RW Racing GP BV switched to Moto2.
AGR Team fielded one bike in Moto3, after spending the previous season in Moto2 with two bikes.
After entering the 2016 season with three bikes, both Leopard Racing and Sky Racing Team VR46 reverted to two bikes in 2017.
After spending the previous season with Mahindra, Platinum Bay Real Estate changed bikes to KTM.
Ongetta-Rivacold changed their name to Snipers Team, with Marinelli Rivacold as their main sponsor.
Mid-season changes
Danny Kent returned to Moto3 after leaving Kiefer Racing in Moto2. After joining Red Bull KTM Ajo as a wildcard at the French GP, at Germany, Kent also replaced Niccolò Antonelli at the same team.
AGR Team folded its operations in both Moto2 and Moto3 following the Aragon GP due to financial issues coupled with poor performance throughout the 2017 season. For the Australian and Malaysian rounds, María Herrera replaced Albert Arenas at the Aspar team. At the Valencia GP, Arenas returned.
Results and standings
Grands Prix
Riders' standings
;Scoring system Points were awarded to the top fifteen finishers. A rider had to finish the race to earn points.
Grand Prix of Qatar
Gran Premio Red Bull de España
HJC Helmets 
Gran Premi 
Motul TT 
GoPro Motorrad Grand Prix Deutschland
Monster Energy Grand Prix České republiky
NeroGiardini Motorrad Grand Prix von Österreich
Octo 
Gran Premio Movistar de Aragón
Motul Grand Prix of Japan
Michelin 
Shell Malaysia 
Gran Premio Motul de la