The 1951 National League Division Three was the fifth and final season of British speedway's National League Division Three The league remained with 10 teams but there were changes. Oxford Cheetahs, Leicester Hunters and Liverpool Chads had all moved up to Division Two whilst Tamworth Tammies dropped out. Plymouth Devils dropped down from Division Two. The three new sides were Cardiff Dragons, Long Eaton Archers and Wolverhampton Wasps. Poole Pirates won their first title. Alan Smith of Plymouth topped the averages.

Final table

Leading Averages

National Trophy Stage Three

The 1951 National Trophy (sponsored by the Daily Mail) was the 14th edition of the Knockout Cup. The Trophy consisted of three stages; stage one was for the third division clubs, stage two was for the second division clubs and stage three was for the top tier clubs. The winner of stage one would qualify for stage two and the winner of stage two would qualify for the third and final stage. Exeter won stage one and therefore qualified for stage two. Third Division Qualifying First round Third Division Qualifying semifinals

Qualifying final

First leg Second leg

Riders' Championship

Ken Middleditch won the National League Division Three Rider's Championship. The final was held at Penarth Road Stadium in Cardiff on 23 October.

Riders & final averages

Aldershot Cardiff Exeter Long Eaton Plymouth Poole Rayleigh St Austell Swindon Wolverhampton