| 1980 Adelaide State of Origin Carnival | |
| Sport: | Australian football |
| Location: | Adelaide, Australia |
| Start Date: | 11 October 1980 |
| End Date: | 13 October 1980 |
| Teams: | 4 |
| Commissioner: | Australian National Football Council |
| Format: | Knockout |
| Final Champion: | Victoria |
| Previous: | 1979 |
| Next: | 1983 |
The 1980 Adelaide State of Origin Carnival was the 21st Australian National Football Carnival, an Australian football competition. It was just the second carnival to take place under the State of Origin format.
Four states took part, the hosts South Australia, Tasmania, Victoria and the reigning carnival champions Western Australia. Football Park hosted all the fixtures, which took place in October after the football season had ended.
| Game | Winning team | Winning team score | Losing team | Losing team score | Ground | Crowd | Date | |
| Semi Final 1 | South Australia | 22.18 (150) | Tasmania | 8.13 (61) | Football Park | 10,666 | 11 October 1980 | |
| Semi Final 2 | Victoria | 14.20 (104) | Western Australia | 9.15 (69) | Football Park | 10,666 (double-header) | 11 October 1980 | |
| 3rd Place Final | Western Australia | 17.23 (125) | Tasmania | 12.18 (90) | Football Park | 17,579 | 13 October 1980 | |
| Grand Final | Victoria | 15.12 (102) | South Australia | 12.13 (85) | Football Park | 17,579 (double-header) | 13 October 1980 |
At the completion of the tournament, the All-Australian team was named, based on performances during the carnival.[3]