| Competition: | sanfl |
| Year: | 1981 |
| Teams: | 10 |
| Count: | 27 |
| Mpcount: | 3 |
| Matches: | 116 |
| Attendance: | 1087854 |
| Highattend: | 52,659 (Grand Final, vs.) |
| Top Goal Scorer: | Tim Evans (98 Goals) |
| Magarey Medal: | Michael Aish (41 votes) |
| Prevseason: | 1980 |
| Nextseason: | 1982 |
The 1981 South Australian National Football League season was the 102nd season of the top-level Australian rules football competition in South Australia.
See main article: 1981 SANFL Grand Final.