The 2003–04 Spartan South Midlands Football League season is the 7th in the history of Spartan South Midlands Football League a football competition in England.
Premier Division
The Premier Division featured 17 clubs which competed in the division last season, along with two clubs, promoted from Division One: Harpenden Town Leverstock Green
League table
Division One
Division One featured 16 clubs which competed in the division last season, along with two new clubs: Buckingham Athletic, promoted from Division Two Sun Postal Sports, joined from the Herts County League
League table
Division Two
Division Two featured 13 clubs which competed in the division last season, along with four new clubs: Arlesey Athletic, new club Kentish Town Markyate Risborough Rangers, relegated from Division One
Also, Padbury United changed name to Padbury B T F C.