| Competition: | ntfl |
| Year: | 1989–90 |
| Teams: | 7 |
| Premiers: | St Marys |
| Count: | 16 |
| Minor Premiers: | St Marys |
| Mpcount: | 18 |
| Wooden Spooners: | Wanderers |
| Wscount: | 22 |
| Prevseason: | 1988 |
| Nextseason: | 1990 |
The 1989–90 NTFL season was the 69th season of the Northern Territory Football League (NTFL).[1]
St Marys have won their 16th premiership title while defeating the Darwin Buffaloes in the grand final by 108 points.