1981 British motorcycle Grand Prix

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1981 British motorcycle Grand Prix

The 1981 British motorcycle Grand Prix was the 11th round of the 1981 Grand Prix motorcycle racing season. It took place at the Silverstone Circuit in the United Kingdom on 2 August 1981, with the weekend running 31 July–2 August.

500 cc
- Pole position: Graeme Crosby (New Zealand) – 1:30.400
- Fastest lap: Randy Mamola and Kork Ballington – 1:31.400
- Podium: 1st Jack Middelburg (Netherlands, Suzuki Racing Westland), 2nd Kenny Roberts (USA, Yamaha), 3rd Randy Mamola (USA, Suzuki)

350 cc
- Pole: Anton Mang (West Germany) – 1:33.500
- Podium: 1st Anton Mang, 2nd Keith Huewen (UK), 3rd Jean-François Baldé (France)

250 cc
- Pole: Anton Mang
- Podium: 1st Anton Mang, 2nd Roland Freymond (Switzerland), 3rd Graeme McGregor (Australia)

125 cc
- Pole: Jacques Bolle (France) – 1:42.510
- Podium: 1st Ángel Nieto (Spain), 2nd Jacques Bolle (France), 3rd Hugo Vignetti (Italy)

50 cc
- No race held

This event was part of the 1981 season, contributing to the overall results of riders across multiple classes.