| Competition: | ntfl |
| Year: | 1990–91 |
| Teams: | 7 |
| Premiers: | St Marys |
| Count: | 17 |
| Minor Premiers: | St Marys |
| Mpcount: | 19 |
| Wooden Spooners: | Palmerston |
| Wscount: | 6 |
| Prevseason: | 1989 |
| Nextseason: | 1991 |
The 1990–91 NTFL season was the 70th season of the Northern Territory Football League (NTFL).[1]
St Marys have won there 17th premiership title while defeating the Darwin Buffaloes in the grand final by 53 points.