| Competition: | sanfl |
| Year: | 1978 |
| Teams: | 10 |
| Count: | 24 |
| Mpcount: | 8 |
| Matches: | 116 |
| Attendance: | 1048871 |
| Highattend: | 50,867 (Grand Final, vs.) |
| Top Goal Scorer: | Tim Evans (90 Goals) |
| Magarey Medal: | Kym Hodgeman (50 votes) |
| Prevseason: | 1977 |
| Nextseason: | 1979 |
The 1978 South Australian National Football League season was the 99th season of the top-level Australian rules football competition in South Australia.