The 1949 National League Division One was the 15th season of speedway in the United Kingdom and the fourth post-war season of the highest tier of motorcycle speedway in Great Britain.
Wembley Lions won the National League for the fourth time.
Belle Vue Aces won the third and final stage and were therefore declared the 1949 National Trophy champions.
[8] First round Second round Semifinals First leg Second leg Belle Vue were National Trophy Champions, winning on aggregate 140–76.
First round Semi final round First leg Second leg Wembley won on aggregate 124–92 Belle Vue Birmingham Harringay New Cross Odsal Wembley West Ham Wimbledon