- Source: 1991 SASF season
The 1991 South Australian Soccer Federation season was the 85th season of soccer in South Australia.
1991 SASF Division One
The 1991 South Australian Division One season was the 85th season of first division soccer in South Australia.
West Adelaide Hellas were champions for the 10th time. Blackwood were relegated. West Adelaide Hellas and Adelaide City both withdrew from SASF competitions at the end of the season.
= League Table
=1991 SASF Division Two
The 1991 South Australian Division Two season was the 67th season of second division soccer in South Australia.
Elizabeth City were champions for the third time, and were promoted.
= League Table
=1991 Top Four Cup
The 1991 Top Four Cup, known as the 1991 Coca-Cola Cup for sponsorship reasons, was the 23rd and final edition of the Top Four Cup, a post-season knockout competition contested by the top four teams from the Division One season.
Salisbury United won the competition for the first time.