The 1981 British Speedway Championship was the 21st edition of the British Speedway Championship. The Final took place on 3 June at Brandon in Coventry, England. The Championship was won by Steve Bastable, who beat Kenny Carter and John Louis in a run-off for the title. The top eight riders qualified for the next stage of the World Championship, the 1981 Overseas Final.
Rob Lightfoot won the British Speedway Under 21 Championship. The final was held at Kingsmead Stadium on 4 July.