The 1990–91 NSL Cup was the 15th edition of the NSL Cup, which was the main national association football knockout cup competition in Australia.
South Melbourne were the defending champions, having defeated Sydney Olympic to win their first title in the previous year's final, but they were eliminated in the semi-finals by eventual winners Melita Eagles.
Melita Eagles defeated Preston Makedonia 1–0 in the final to win their first NSL Cup title.
Teams The NSL Cup was a knockout competition with 14 teams taking part all trying to reach the Final in April 1991. The competition consisted of the 14 teams from the National Soccer League.
Round Main date Number of fixtures Clubs remaining First round Wednesday 21 November 1990 6 14 → 8 Second round Wednesday 5 December 1990 4 8 → 4 Semi-finals Wednesday 13 February 1991 2 4 → 2 Final Sunday 7 April 1991 1 2 → 1
First round Melita Eagles and Preston Makedonia had a bye for the First round.
Second round
Semi-finals
Final
References