The 2008–09 Spartan South Midlands Football League season is the 12th in the history of Spartan South Midlands Football League a football competition in England.
The Premier Division featured 19 clubs which competed in the division last season, along with three new clubs:
Division One featured 16 clubs which competed in the division last season, along with five new clubs.
Also, Ruislip Manor changed name to Tokyngton Manor.
Division Two featured 13 clubs, which competed in the division last season, along with five new clubs: