| Competition: | ntfl |
| Year: | 1965–66 |
| Teams: | 5 |
| Premiers: | St Marys |
| Count: | 6 |
| Minor Premiers: | St Marys |
| Mpcount: | 6 |
| Wooden Spooners: | Wanderers |
| Wscount: | 13 |
| Prevseason: | 1964 |
| Nextseason: | 1966 |
The 1965–66 NTFL season was the 45th season of the Northern Territory Football League (NTFL).[1]
St Marys have won there 6th premiership title while defeating Nightcliff in the grand final by 37 points.