2016–17 Eastern Counties Football League

The 2016–17 season was the 74th in the history of the Eastern Counties Football League, a football competition in England.

Mildenhall 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.

Premier Division
The Premier Division featured 18 clubs which competed in the division last season, along with three new clubs, promoted from the Division One:
 * Ely City
 * Great Yarmouth Town
 * Wivenhoe Town

The following five clubs applied for promotion to Step 4: Felixstowe & Walton United, Mildenhall Town, Newmarket Town, Stanway Rovers.

Division One
Division One featured 16 clubs which competed in the division last season, along with five new clubs:
 * Coggeshall Town, promoted from Essex and Suffolk Border League
 * Framlingham Town, promoted from the Suffolk and Ipswich League
 * Holland, promoted from the Essex and Suffolk Border League
 * Whitton United, relegated from the Premier Division
 * Wisbech St Mary, promoted from the Cambridgeshire County League