1985–86 Isthmian League

The 1985–86 season was the 71st season of the Isthmian League, which is an English football competition featuring semi-professional and amateur clubs from London, East and South East England. League consisted of three divisions. Division Two was divided into two sections.

Sutton United won the league for the second season in a row and finally were promoted to the Conference.

Premier Division
The Premier Division consisted of 22 clubs, including 19 clubs from the previous season and three new clubs:
 * Farnborough Town, promoted as champions of Division One
 * Kingstonian, promoted as runners-up in Division One
 * Yeovil Town, relegated from the Alliance Premier League

Division One
Division One consisted of 22 clubs, including 16 clubs from the previous season and six new clubs:

Two clubs relegated from the Premier Division:
 * Harlow Town
 * Leytonstone/Ilford

Two clubs promoted from Division Two North:
 * Finchley
 * Leyton-Wingate

Two clubs promoted from Division Two South:
 * Grays Athletic
 * Uxbridge

Division Two North
Division Two North consisted of 20 clubs, including 16 clubs from the previous season and four new clubs:


 * Clapton, relegated from Division One
 * Hertford Town, relegated Division One
 * Rainham Town, transferred from Division Two South
 * Vauxhall Motors (Luton), joined from the South Midlands League

Division Two South
Division Two South consisted of 20 clubs, including 15 clubs from the previous season and five new clubs:


 * Flackwell Heath, transferred from Division Two North
 * Marlow, transferred from Division Two North
 * Metropolitan Police, relegated from Division One
 * Southwick, joined from the Combined Counties League
 * Woking, relegated from Division One