1951 Grand Prix motorcycle racing season

Road Racing World Championship Grand Prix season.

The season consisted of eight Grand Prix races in five classes: 500cc, 350cc, 250cc, 125cc and Sidecars 500cc.

As of 2024, this is the most recent season the premier class was won by a non-Japanese or non-Italian constructor.

† The race saw only four competitors and was not counted as a round of the World Championship.

Bold – Pole Italics – Fastest Lap Each constructor is awarded the same number of points as their best placed rider in each race.

Geoff Duke , the 1951 350cc and 500cc World Champion.