| NSL Cup | |
| Year: | 1991–92 |
| Other Titles: | National Soccer League Cup |
| Country: | Australia |
| Num Teams: | 14 |
| Winners: | Adelaide City |
| Count: | 3 |
| Second: | Marconi Fairfield |
| Matches: | 13 |
| Prev Season: | 1990–91 |
| Next Season: | 1992–93 |
The 1991–92 NSL Cup was the 16th edition of the NSL Cup, which was the main national association football knockout cup competition in Australia.
Melita Eagles were the defending champions, having defeated Preston Makedonia to win their first title in the previous year's final, but they were eliminated in the first round by Sydney Croatia.[1]
Adelaide City defeated Marconi Fairfield 2–1 in the final to win their third NSL Cup title.
The NSL Cup was a knockout competition with 14 teams taking part all trying to reach the Final in April 1992.[2] The competition consisted of the 14 teams from the National Soccer League.
| Round | Main date | Number of fixtures | Clubs remaining | |
|---|---|---|---|---|
| First round | Wednesday 30 October 1991 | 7 | 14 → 7 | |
| Second round | Wednesday 4 December 1991 | 4 | 7 → 4 | |
| Semi-finals | Wednesday 11 March 1992 | 2 | 4 → 2 | |
| Final | Sunday 5 April 1992 | 1 | 2 → 1 |
Adelaide City had a bye for the Second round.
See main article: 1992 NSL Cup final.