| League | National League Division One |
|---|---|
| No. of competitors | 7 |
| Champions | New Cross Rangers |
| National Trophy | Wembley Lions |
| Anniversary Cup | Harringay Racers |
| Riders' champion | Vic Duggan |
| London Cup | Wembley Lions |
| Highest average | Vic Duggan |
| Division/s below | National League (Div 2) National League (Div 3) |
The 1948 National League Division One was the 14th season of speedway in the United Kingdom and the third post-war season of the highest tier of motorcycle speedway in Great Britain.[1][2]