A total of 11 teams contest the league.

The 1998 regular season took place over 19 rounds between 30 January 1998 and 9 June 1998.

Updated to match(es) played on 9 June 1998.

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.

3North Melbourne Giants won Head-to-Head (2-1).