| Competition: | sanfl |
| Year: | 1940 |
| Teams: | 8 |
| Count: | 5 |
| Mpcount: | 20 |
| Matches: | 72 |
| Highattend: | 28,500 (Grand Final, vs.) |
| Top Goal Scorer: | Ken Farmer (125 Goals) |
| Magarey Medal: | Mel Brock |
| Prevseason: | 1939 |
| Nextseason: | 1941 |
The 1940 South Australian National Football League season was the 61st season of the top-level Australian rules football competition in South Australia.
See main article: 1940 SANFL Grand Final.