|Start date 1970|
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The 1970 Grand Prix motorcycle racing season was the 22nd F.I.M. Road Racing World Championship Grand Prix season. The season consisted of twelve Grand Prix races in six classes: 500cc, 350cc, 250cc, 125cc, 50cc and Sidecars 500cc. It began on 3 May, with West German Grand Prix and ended with Spanish Grand Prix on 27 September.
With little opposition, Giacomo Agostini and MV Agusta continued to dominate the 500 class. Life was a bit tougher for Agostini in the 350 class as Kel Carruthers and Renzo Pasolini on Benellis and Rod Gould on a factory Yamaha gave him a battle on more than one occasion. Gould would take the 250 title for Yamaha, battling Carruthers for the entire season. German Dieter Braun would give Suzuki the 125 crown while Derbi mounted Angel Nieto claimed the 50cc class for the second year in a row.
Spanish rider Santiago Herrero tragically lost his life at the 1970 Isle of Man TT. The Ossa factory pulled out of racing after the accident.
Points were awarded to the top ten finishers in each race. Only the best of six races were counted on 50cc, 125cc, 350cc and 500cc championships, best of seven in 250cc, while in the Sidecars, the best of five races were counted.