The 1908–09 season was the 15th in the history of Southern Football League.
Northampton Town won Division One and Croydon Common finished top of Division Two.
[1] No clubs applied for election to the Football League.
A total of 21 teams contested the division, including 18 sides from previous season and three new teams.
A total of seven teams contested the division, including three sides from the previous season and four newly elected teams.