Football League Third Division South

The Football League Third Division South was a level of English professional football which ran in parallel to Third Division North from 1921 to 1958.

The division was created in 1921 from the Third Division, formed one year earlier when the Football League absorbed the leading clubs from the Southern League.

The following season, a Northern section was created, and the original division was renamed Third Division South. The exceptions to this were Crystal Palace, who were promoted to the Second Division, Grimsby Town who transferred to the Third Division North and Aberdare Athletic and Charlton Athletic who joined for the first time. Several Midlands-based teams were included in the South division, even though most were geographically closer to their Northern division rivals, such as Nottingham Forest and Notts County being included in the Southern division even though nearby Derby County spent time in the Northern division.

The division originally had 22 teams, expanding to 24 in 1950. Only one promotion place was available to the Second Division, meaning that many clubs spent long periods of time stuck in the division, and several were never promoted in the division's 31 seasons. At the end of each season, the bottom two clubs were put up for re-election, alongside the bottom two in the Northern section, although most survived the re-election vote. Ipswich Town, Nottingham Forest, and Portsmouth are the only Third Division South champions who became First Division Champions.

In 1958, the North and South sections were merged to form a single Third Division and a new Fourth Division.

From 1934 to the war's outbreak there was a short-lived knockout Football League Third Division South Cup.

From 1954/55 season until 1957/58 season, there was a series of games between teams representing the Third Division North and the Third Division South. Football League Third Division North vs. South Representative Games.