| League | National League Division One |
|---|---|
| No. of competitors | 8 |
| Champions | Wembley Lions |
| National Trophy | Belle Vue Aces |
| London Cup | Wembley Lions |
| Highest average | Vic Duggan |
| Division/s below | National League (Div 2) National League (Div 3) |
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.[1]