The 1980 regular season took place over 18 rounds between 2 February 1980 and 8 June 1980.
Updated to match(es) played on 8 June 1980.
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.
1Head-to-Head between St. Kilda Saints and West Adelaide Bearcats (1-1).
3Head-to-Head between Coburg Giants and City of Sydney Astronauts (1-1).