2003–04 Spartan South Midlands Football League

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

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

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.