The 1984 National League was contested as the second division of motorcycle speedway in the United Kingdom.
A new team called the Arena Essex Hammers, promoted by Wally Mawdsley joined the league. Crayford Kestrels moved to Hackney Wick Stadium to become the Hackney Kestrels.
The title was won by the Long Eaton Invaders who finished just one point clear of the Mildenhall Fen Tigers. Remarkably the Long Eaton Invaders had gone from finishing last in 1983 to first in 1984 under former rider Vic White. He had been brought in as the team manager and had signed Graham Drury and Chris Pidcock to support Dave Perks, Paul Stead and David Tyler.
The 1984 National League Knockout Cup was the 17th edition of the Knockout Cup for tier two teams. Hackney Kestrels were the winners of the competition.
First round
Quarter-finals
Semi-finals
First leg
Second leg
Hackney were declared Knockout Cup Champions, winning on aggregate 83âÂÂ72.
Ian Barney won the Riders' Championship. The final was originally held at Wimbledon Stadium on 23 September but was abandoned after eight heats due to rain. The Championship was restaged on 13 October at East of England Arena.
The National League Pairs was held at Hackney Wick Stadium on 30 June and was won by Stoke Potters.
Semi finals
Final
Mildenhall won the fours championship final, held at the East of England Showground on 22 July.
Semi finals
Final
Arena Essex
Berwick
Boston
Canterbury
Edinburgh
Glasgow
Hackney
Long Eaton
Middlesbrough
Mildenhall
Milton Keynes
Peterborough
Rye House
Scunthorpe
Stoke
Weymouth