The 2016–17 season was the 74th in the history of the Eastern Counties Football League, a football competition in England.
[1] 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.
The Premier Division featured 18 clubs which competed in the division last season, along with three new clubs, promoted from the Division One: The following five clubs applied for promotion to Step 4:[2] Felixstowe & Walton United, Mildenhall Town, Newmarket Town, Stanway Rovers.
Division One featured 16 clubs which competed in the division last season, along with five new clubs: