1980 NSL Cup
The 1980 NSL Cup was the fourth edition of the NSL Cup, which was the main national association football knockout cup competition in Australia.
Adelaide City were the defending champions, having defeated St George-Budapest to win their first title in the previous year's final, but they were eliminated in the semi-finals by finalist Heidelberg United.
Marconi Fairfield defeated Heidelberg United 3–0 via a replay after a 0–0 draw in the final to win their first NSL Cup title.
Teams
The NSL Cup was a knockout competition with 32 teams taking part all trying to reach the Final in October 1980. The competition consisted of the 14 teams from the National Soccer League plus 18 teams from their respective top division state leagues.| Round | Main date | Number of fixtures | Clubs remaining |
| First round | Friday 25 April 1980 | 16 | 32 → 16 |
| Second round | Sunday 6 July 1980 | 8 | 16 → 8 |
| Quarter-finals | Sunday 3 August 1980 | 4 | 8 → 4 |
| Semi-finals | 2 | 4 → 2 | |
| Final | Wednesday 15 October 1980 | 2 | 2 → 1 |