1986–87 South Midlands League

The 1986–87 South Midlands League season was 58th in the history of South Midlands League.

Premier Division
The Premier Division featured 15 clubs which competed in the division last season, along with 1 new club, promoted from last season's Division One:
 * Totternhoe

Division One
The Division One featured 11 clubs which competed in the division last season, along with 3 new clubs:
 * GS Ashcroft Co-op, relegated from Premier Division
 * Caddington
 * Milford Villa