2023–24 Eastern Counties Football League

The 2023–24 Eastern Counties Football League was the 81st season in the history of the Eastern Counties Football League, a football competition in England. Teams are divided into three divisions, the Premier Division at Step 5, and the geographically separated Division One North and Division One South (Eastern Senior League), both at Step 6 of the English football league system.

The constitution was announced on 15 May 2023. Starting this season, the Premier Division in the league promotes two clubs; one as champions and one via a four-team play-off. This replaced the previous inter-step play-off system. For this season only, there was only one club relegated from the Step 5 division.

Premier Division
The Premier Division featured 17 clubs which competed in the division last season, along with three new clubs:
 * Dereham Town, relegated from the Northern Premier League
 * Downham Town, promoted from Division One North
 * Heacham, promoted from Division One North

Final
Note: Thetford Town played an ineligible player in their play-off semi-final away at Mulbarton Wanderers on 27 April 2024. The league originally removed Thetford from the playoffs and instated Mulbarton into the final. Following an appeal by Thetford, the FA ordered the semi-final to be replayed.

Division One North
Division One North featured 15 clubs which competed in the previous season, along with six new clubs.
 * Relegated from the Premier Division
 * Haverhill Rovers
 * Whitton United
 * Transferred from Division One South
 * Stanway Pegasus
 * Wivenhoe Town
 * Plus:
 * Dussindale & Hellesdon Rovers, promoted from the Anglian Combination
 * FC Peterborough, promoted from the Peterborough and District League

Division One South
Division One South featured 14 clubs which competed in the division last season, along with eight new clubs:
 * Brimsdown, promoted from the Essex Alliance League
 * Clapton, relegated from the Essex Senior League
 * Clapton Community, promoted from the Middlesex County League
 * Dunmow Town, promoted from the Essex and Suffolk Border League
 * Harlow Town, resigned from the Southern League
 * Hoddesdon Town, relegated from the Spartan South Midlands League
 * Hutton, promoted from the Essex Olympian League
 * Southend Manor, relegated from the Essex Senior League