| 1991 New Zealand NBL season | |
|---|---|
| League | National Basketball League |
| Sport | Basketball |
| Number of teams | 12 |
| Regular season | |
| Minor premiers | Hutt Valley Lakers |
| Top scorer | Ronnie Joyner (Waikato Warriors) |
| Playoffs | |
| Champions | Hutt Valley Lakers |
| Runners-up | Wellington Saints |
The 1991 New Zealand National Basketball League season was the 10th running of the competition. The Hutt Valley Lakers won the championship in 1991 to claim their first league title.