| Competition: | sanfl |
| Year: | 2003 |
| Teams: | 9 |
| Count: | 3 |
| Mpcount: | 6 |
| Matches: | 94 |
| Attendance: | 313212 |
| Highattend: | 28,199 (Grand Final, vs.) |
| Top Goal Scorer: | Darren Bradshaw (88 Goals) |
| Magarey Medal: | Brett Ebert (25 votes) |
| Prevseason: | 2002 |
| Nextseason: | 2004 |
The 2003 South Australian National Football League season was the 124th season of the top-level Australian rules football competition in South Australia.