The 1981 National League was contested as the second division/tier of Speedway in the United Kingdom.
The league started with 20 teams with Nottingham Outlaws dropping out after the BSPA refused an application by promoter Maurice Jones to run during 1981. However, Wolverhampton Wolves joined having moved down from the British League. Wolves promoter Mike Parker was replaced by Dan McCormick for the 1981 season.
Berwick Bandits were forced to quit after 26 league meetings, their record being expunged. Middlesbrough Tigers comfortably won their first ever title.
Exeter Falcons rider Tony Sanford died following an accident at the County Ground Stadium on 7 September. He was racing in a match against Milton Keynes when he hit a barrier near the final bend. A memorial trophy was held in subsequent years in his memory.
The 1981 National League Knockout Cup was the 14th edition of the Knockout Cup for tier two teams. Edinburgh Monarchs were the winners of the competition.
First round
Second round
Quarter-finals
Semi-finals
First leg
Second leg
Edinburgh were declared Knockout Cup Champions, winning on aggregate 101âÂÂ89.
Mike Ferreira won the Riders' Championship, held at Wimbledon Stadium on 26 September 1981.
The National League Pairs was held at The Shay on 18 July and was won by Canterbury Crusaders.
Semi finals
Final
Edinburgh Monarchs won the fours championship final, held at the East of England Arena on 26 July.
Semi finals
Final
Berwick (withdrew from league)
Boston
Canterbury
Crayford
Edinburgh
Ellesmere Port
Exeter
Glasgow
Middlesbrough
Mildenhall
Milton Keynes
Newcastle
Oxford
Peterborough
Rye House
Scunthorpe
Stoke
Weymouth
Wolverhampton
Workington