2017–18 Eastern Counties Football League

The 2017–18 season was the 75th in the history of Eastern Counties Football League, a football competition in England. It was also the last season to have a single division at Step 6.

The constitution for Step 5 and Step 6 divisions for 2017–18 was announced on 26 May 2017, and the Eastern Counties divisions constitutions were ratified at the league's AGM on 17 June 2017.

Coggeshall Town were champions, winning their first Eastern Counties Football League title and were promoted to the Isthmian League for the first time in their history. Felixstove & Walton United finished second and were promoted due to expansion of step 4 up to seven divisions.

Premier Division
The Premier Division featured 19 clubs which competed in the division last season, along with five new clubs:
 * Coggeshall Town, promoted from Division One
 * Haverhill Borough, promoted from Division One
 * Histon, relegated from the Southern Football League
 * Stowmarket Town, promoted from Division One
 * Wroxham, relegated from the Isthmian League

Division One
Division One featured 17 clubs which competed in the division last season, along with four new clubs:
 * Little Oakley, promoted from the Essex and Suffolk Border League
 * Norwich United reserves
 * Spixworth, promoted from the Anglian Combination, with a name change to Norwich CBS
 * Swaffham Town, relegated from Premier Division