The 1980 NBL Finals was the postseason tournament of the National Basketball League's 1980 season, which began in February. The finals began on 14 June. The tournament concluded with the minor premiers St Kilda Saints defeating the second-seeded West Adelaide Bearcats in the NBL Grand Final on 15 June. Rocky Smith was named NBL Grand Final MVP.
The NBL finals series in 1980 consisted of two semifinal games, and one championship-deciding grand final. The finals were contested between the top four teams of the regular season, with the finals weekend hosted at the neutral Dowling Street Stadium in Launceston, Tasmania.
|- bgcolor="#CCCCFF" font size=1 !width=90| Date !width=180| Home !width=60| Score !width=180| Away !width=70| Box Score
|- bgcolor="#CCCCFF" font size=1 !width=90| Date !width=180| Home !width=60| Score !width=180| Away !width=70| Box Score