The 1981 British motorcycle Grand Prix was the eleventh round of the 1981 Grand Prix motorcycle racing season. It took place on the weekend of 31–2 August 1981 at the Silverstone Circuit.

Pos.	Rider	Team	Manufacturer	Time/Retired	Points
1	Jack Middelburg	Racing Westland	Suzuki	43'24.340	15
2	Kenny Roberts	Yamaha Motor Company	Yamaha	+0.300	12
3	Randy Mamola	Ingersoll Herin Team Suzuki	Suzuki	+13.040	10
4	Bernard Fau		Yamaha	+36.220	8
5	Marc Fontan	Team Sonauto Gauloises	Yamaha	+36.560	6
6	Boet van Dulmen		Yamaha	+37.790	5
7	Stuart Avant	Ellis Racing	Suzuki	+44.950	4
8	Ikujiro Takai		Yamaha	+45.410	3
9	Steve Parrish	Team Mitsui Yamaha	Yamaha	+45.790	2
10	Chris Guy		Suzuki	+53.360	1
11	Graziano Rossi		Yamaha	+1'06.370
12	Peter Sjöström		Suzuki	+1'13.310
13	Guido Paci		Yamaha	+1'14.280
14	Roberto Pietri		Suzuki	+1'24.220
15	Andreas Hofmann		Suzuki	+1'25.010
16	Franco Uncini		Suzuki	+1 lap
17	Graham Wood		Yamaha	+1 lap
18	Christian Sarron	Team Sonauto Gauloises	Yamaha	+1 lap
19	Marco Lucchinelli	Team Nava Suzuki	Suzuki	+1 lap
20	Alex George		Yamaha	+1 lap
21	Barry Woodland		Lombardini	+1 lap
22	Carlo Perugini	Moto Sanvenero	Sanvenero	+1 lap
NC	Dave Potter		Yamaha	Not classified
NC	Sadao Asami		Yamaha	Not classified
Ret	Freddie Spencer		Honda	Retired
Ret	Christian Estrosi		Pernod	Retired
Ret	Keith Huewen	Heron Suzuki GB	Suzuki	Retired
Ret	Philippe Coulon		Suzuki	Retired
Ret	Michel Frutschi	Elf Motor Racing Team	Yamaha	Retired
Ret	Sergio Pellandini		Suzuki	Retired
Ret	Gary Lingham		Suzuki	Retired
Ret	Dale Singleton	Beaulieu Racing	Suzuki	Retired
Ret	Steve Henshaw		Suzuki	Retired
Ret	Graeme Crosby	Ingersoll Herin Team Suzuki	Suzuki	Retired
Ret	Dennis Ireland		Suzuki	Retired
Ret	Corrado Tuzii		Suzuki	Retired
Ret	John Newbold		Suzuki	Retired
Ret	Barry Sheene		Yamaha	Retired
Ret	Kork Ballington	Team Kawasaki	Kawasaki	Retired
Sources:[4][5]