| Competition: | sanfl |
| Year: | 1931 |
| Teams: | 8 |
| Count: | 6 |
| Mpcount: | 15 |
| Matches: | 72 |
| Highattend: | 34,202 (Grand Final, vs.) |
| Top Goal Scorer: | Ken Farmer (126 Goals) |
| Magarey Medal: | Jack Sexton |
| Prevseason: | 1930 |
| Nextseason: | 1932 |
The 1931 South Australian National Football League season was the 52nd season of the top-level Australian rules football competition in South Australia.
See main article: 1931 SANFL Grand Final.