1990–91 Southern Football League

The 1990–91 Southern Football League season saw Farnborough Town win the Premier Division to earn promotion to the Football Conference, having been relegated from the Conference the year before.Weymouth, who finished bottom of the Premier Division, were relegated to the Southern Division, whilst Rushden Town, despite finishing fourteenth, were relegated to the Midland Division as their ground did not meet the Premier Division criteria. The champions of the Midland and Southern Divisions both failed to win promotion, meaning that only the second-placed clubs, Corby Town and Trowbridge Town were promoted.

The Premier Division featured five new clubs:

The Midland Division featured four new clubs:

The Southern Division featured five new clubs:

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