| 1990 NBL Finals | |
| League: | National Basketball League |
| Sport: | Basketball |
| Duration: | 26 September - 28 October 1990 |
| No Of Teams: | 6 |
| Tv: | Seven Network |
| Finals: | NBL Finals |
| Finals Champ: | Perth Wildcats |
| Finals Runner-Up: | Brisbane Bullets |
| Finals Mvp: | Ricky Grace |
| Finals Mvp Link: | NBL (Australia) Most Valuable Player – Grand Final |
| Prevseason Year: | 1989 |
| Nextseason Year: | 1991 |
The 1990 NBL Finals was the championship series of the 1990 season of Australia's National Basketball League (NBL) and the conclusion of the season's playoffs. The Perth Wildcats defeated the Brisbane Bullets in three games (2-1) for their first NBL championship.
The 1990 National Basketball League Finals started on 26 September and concluded on 28 October. The playoffs consisted of two best of three Elimination Finals, two best of three Semifinals and the best of three game Grand Final series. As the two top teams at the end of the regular season, the North Melbourne Giants and Eastside Spectres both qualified for home court advantage during the Semifinals.
| Team | Finals appearance | Previous appearance | Previous best performance |
|---|---|---|---|
| 3rd | Champions (1989) | ||
| 6th | Runner up (1981) | ||
| 8th | Champions (1985, 1987) | ||
| 4th | 1989 | Runner up (1987) | |
| 2nd | 1989 | 5th in 1989 | |
| 2nd | 1989 | 4th in 1989 | |
The NBL tie-breaker system as outlined in the NBL Rules and Regulations states that in the case of an identical win–loss record, the results in games played between the teams will determine order of seeding.
1Head-to-Head between Eastside Spectres and Brisbane Bullets (1-1). Eastside Spectres won For and Against (+7).
2Head-to-Head between Melbourne Tigers and Perth Wildcats (1-1). Melbourne Tigers won For and Against (+11).
3Sydney Kings won Head-to-Head (2-0).
The 1990 Grand Final series between the Brisbane Bullets and Perth Wildcats saw a then record aggregate attendance for an NBL Grand Final series with 34,580 attending the 3 games. Game 2 at the Brisbane Entertainment Centre attracted a then record Australian indoor sporting attendance (and NBL record crowd) of 13,221.