1929–30 Southern Football League

The league consisted of Eastern and Western Divisions.

Aldershot were declared Southern League champions after winning a championship play-off 4–2.

They replaced Merthyr Town, who rejoined the Southern League the following season.

In addition to Thames, a total of 12 clubs left the Southern League at the end of this season.

Newly elected team: Three Southern League clubs, Aldershot Town, Thames Association and Llanelly, applied to join the Football League.