1991–92 NSL Cup
| National Soccer League Cup | |
|---|---|
| Tournament details | |
| Country | Australia |
| Dates | 30 October 1991 – 5 April 1992 |
| Teams | 14 |
| Final positions | |
| Champions | Adelaide City (3rd title) |
| Runners-up | Marconi Fairfield |
| Tournament statistics | |
| Matches played | 13 |
| Attendance | 21,881 (1,683 per match) |
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.
Adelaide City defeated Marconi Fairfield 2–1 in the final to win their third NSL Cup title.