| 1991 SANFL season | |
|---|---|
| Teams | 9 |
| Premiers | North Adelaide 13th premiership |
| Minor premiers | South Adelaide 4th minor premiership |
| Magarey Medallist | Mark Naley South Adelaide (29 votes) |
| Ken Farmer Medallist | Scott Morphett Woodville-West Torrens (99 Goals) |
| Attendance | |
| Matches played | 105 |
| Total attendance | 560,114 (5,334 per match) |
| Highest | 39,276 (Grand Final, North Adelaide vs. West Adelaide) |
The 1991 SANFL season was the 112th season of the highest level Australian rules football Competition in South Australia.Woodville and West Torrens merged as the Eagles[1] at the end of the 1990 season resulting in the competition reducing from 10 to 9 clubs.