1931 Speedway Southern League

The 1931 Southern League was the third season of speedway racing in the United Kingdom for Southern British teams, and its final season before amalgamation of the two regional leagues. Both Birmingham teams based at Perry Barr and Hall Green had left as had Coventry who returned mid-season to replace Leicester who were liquidated in April. Harringay Canaries resigned in June to be replaced by Belle Vue who then rode both in the Northern and Southern Leagues. Nottingham closed in July but they were not replaced and their results stood. The league season was the longest in the short history of the competition as teams met each other four times instead of twice.

The Wembley Lions won their second consecutive title.