The 1975–76 season was the 61st in the history of the Isthmian League, an English football competition.
It was the last Isthmian League season to use goal average as a tie-breaker.
Enfield won Division One, while Tilbury won Division Two.
Division One
Division One featured 22 clubs, including 20 clubs from the previous season and two clubs, promoted from Division Two: Southall & Ealing Borough, who also changed name from Southall at the end of the previous season. Staines Town
League table
Stadia and locations
Club Stadium Barking Mayesbrook Park Bishop's Stortford Woodside Park Clapton The Old Spotted Dog Ground Dagenham Victoria Road Dulwich Hamlet Champion Hill Enfield Southbury Road Hayes Church Road Hendon Claremont Road Hitchin Town Top Field Ilford Victoria Road Kingstonian Kingsmeadow Leatherhead Fetcham Grove Leytonstone Granleigh Road Oxford City Marsh Lane Slough Town Wexham Park Southall & Ealing Borough Robert Parker Stadium Staines Town Wheatsheaf Park Sutton United Gander Green Lane Tooting & Mitcham United Imperial Fields Walthamstow Avenue Green Pond Road Woking The Laithwaite Community Stadium Wycombe Wanderers Adams Park
Division Two
Division Two expanded up to 22 clubs, including 16 clubs from the previous season and six new clubs: Two clubs relegated from Division One: Bromley Walton & Hersham
Four clubs transferred from the Athenian League: Harrow Borough Hornchurch Ware Wembley
League table
Stadia and locations
Club Stadium Aveley The Mill Field Boreham Wood Meadow Park Bromley Hayes Lane Carshalton Athletic War Memorial Sports Ground Chesham United The Meadow Corinthian-Casuals King George's Field Croydon Croydon Sports Arena Finchley Summers Lane Hampton Beveree Stadium Harlow Town Harlow Sportcentre Harrow Borough Earlsmead Stadium Harwich & Parkeston Royal Oak Hertford Town Hertingfordbury Park Hornchurch Hornchurch Stadium Horsham Queen Street Maidenhead United York Road St Albans City Clarence Park Tilbury Chadfields Walton & Hersham The Sports Ground Ware Wodson Park Wembley Vale Farm Wokingham Town Cantley Park
References