1985–86 South Midlands League

The 1985–86 South Midlands League season was 57th in the history of South Midlands League.

Premier Division
The Premier Division featured 13 clubs which competed in the division last season, along with 3 new clubs, promoted from last season's Division One:
 * Milton Keynes Borough
 * Langford
 * Cranfield United

Division One
The Division One featured 10 clubs which competed in the division last season, along with 2 new clubs:
 * Brache Sparta, relegated from Premier Division
 * Buckingham Athletic, joined from North Bucks League