The 1939 National League Division One was an eleventh and unfinished season of the highest tier of motorcycle speedway in Great Britain.
Belle Vue Aces were leading the championship ahead of Wimbledon Dons when the league was abandoned due to the outbreak of World War II .
Wembley and Belle Vue were declared joint winners following the abandonment of the final fixture due to the outbreak of the war.
[7][8] Sheffield Tigers won the Division Two final and therefore secured a place in the quarter-finals.
Quarterfinals Semifinals First round Semi final round First leg Second leg Wimbledon won on aggregate 134–82 Belle Vue Harringay New Cross Southampton Wembley West Ham Wimbledon