1984–85 Isthmian League

The 1984–85 season was the 70th season of the Isthmian League, which is an English football competition featuring semi-professional and amateur clubs from London, East and South East England.

The league consisted of three divisions. After 19 clubs, mainly from the Athenian League joined the league, Division Two was divided into two sections.

Also, it was the first Isthmian League season as an Alliance Premier League feeder league. Sutton United were champions, winning their second Isthmian League title. Wycombe Wanderers were promoted to the APL, as Sutton United and Worthing were ineligible for promotion. Epping Town resigned from the league midway through the season and folded.

Premier Division
The Premier Division consisted of 22 clubs, including 20 clubs from the previous season and two new clubs, promoted from Division One:
 * Epsom & Ewell
 * Windsor & Eton

Division One
Division One consisted of 22 clubs, including 18 clubs from the previous season and four new clubs:

Two clubs relegated from the Premier Division:
 * Bromley
 * Staines Town

Two clubs promoted from Division Two:
 * Basildon United
 * St Albans City

Division Two North
Division Two North consisted of 21 clubs, including eight clubs transferred from Division Two, one team relegated from Division One and twelve new teams:


 * Clubs transferred from Division Two:
 * Barton Rovers
 * Epping Town
 * Finchley
 * Hemel Hempstead
 * Letchworth Garden City
 * Leyton-Wingate
 * Tring Town
 * Ware


 * Club relegated from Division One:
 * Cheshunt


 * Clubs joined from the Athenian League:
 * Berkhamsted Town
 * Chalfont St Peter
 * Flackwell Heath
 * Harefield United
 * Haringey Borough
 * Kingsbury Town
 * Marlow
 * Wolverton Town


 * Plus:
 * Heybridge Swifts, joined from the Essex Senior League
 * Royston Town, joined from the South Midlands League
 * Saffron Walden Town, joined from the Eastern Counties League
 * Stevenage Borough, joined from the United Counties League

Division Two South
Division Two South consisted of 19 clubs, including eleven clubs transferred from Division Two, one team relegated from Division One and seven new clubs:

Clubs transferred from Division Two:
 * Dorking
 * Eastbourne United
 * Egham Town
 * Grays Athletic
 * Horsham
 * Hungerford Town
 * Molesey
 * Newbury Town
 * Rainham Town
 * Southall
 * Uxbridge

Club relegated from Division One:
 * Feltham

Clubs joined from the Athenian League:
 * Banstead Athletic
 * Camberley Town
 * Chertsey Town
 * Ruislip Manor
 * Whyteleafe

Plus:
 * Bracknell Town, joined from the London Spartan League
 * Petersfield United, joined from the Hampshire League