The 1973–74 Athenian League season was the 51st in the history of Athenian League. The league consisted of 34 teams.
Division One
The previous season Premier Division changed name to Division One before this season. The division featured 10 new teams: 8 promoted from last season's old Division One: Grays Athletic (3rd) Hounslow (4th) Eastbourne United (7th) Letchworth Town (8th) Marlow (9th) Edmonton (11th) Herne Bay (13th) Worthing (14th) 2 promoted from last season's old Division Two: Ruislip Manor (1st) Ware (3rd)
League table
Division Two
The previous season Division One changed name to Division Two before this season. The division featured 14 new teams: 10 promoted from last season's old Division Two: Leyton (4th) Edgware (5th) Rainham Town (6th) Uxbridge (7th) Addlestone (8th) Harrow Borough (9th) Hemel Hempstead (10th) Windsor & Eton (11th) Eastbourne Town (12th) Wingate (14th) 4 joined the division: Alton Town, from Hampshire League Faversham Town, from Metropolitan–London League Molesey, from Spartan League Feltham, from Spartan League