| 1990 SANFL season | |
|---|---|
| Teams | 10 |
| Premiers | Port Adelaide 30th premiership |
| Minor premiers | Port Adelaide 41st minor premiership |
| Magarey Medallist | Scott Hodges Port Adelaide (16 votes) |
| Ken Farmer Medallist | Scott Hodges Port Adelaide (153 goals) |
| Attendance | |
| Matches played | 106 |
| Total attendance | 807,182 (7,615 per match) |
| Highest | 50,589 (Grand Final, Port Adelaide vs. Glenelg) |
The 1990 South Australian National Football League season was the 111th season of the top-level Australian rules football competition in South Australia. The season opened on Saturday 14 April with all of the opening round matches simultaneously, and concluded on Sunday 7 October with the Grand Final in which Port Adelaide (minor premiers) won its 30th premiership by defeating Glenelg (second at the end of the minor rounds).
North Adelaide, Norwood and South Adelaide also made the top (final) five teams and participated in the finals matches. West Adelaide, Central District, Woodville, West Torrens and Sturt all missed the top five, with the latter finishing last to win its 12th wooden spoon.
This was the last SANFL season with Woodville and West Torrens as they would merge to form Woodville-West Torrens, and also the last SANFL season before the introduction of Adelaide into the Australian Football League. This effectively relegating the SANFL to second tier status in South Australia.