With the addition of the Gold Coast Cougars a total of 14 teams contested the league.
The 1990 regular season took place over 23 rounds between 30 March 1990 and 22 September 1990.
Updated to match(es) played on 22 September 1990.
Source: NBL.com.au 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.
2Head-to-Head between Melbourne Tigers and Perth Wildcats (1-1).