1990–91 Eastern Counties Football League

The 1990–91 season was the 49th in the history of Eastern Counties Football League a football competition in England.

Wisbech Town were champions, winning their third Eastern Counties Football League title, while Braintree Town were promoted to the Southern Football League for the first time in their history.

Premier Division
The Premier Division featured 20 clubs which competed in the division last season, along with one new club, promoted from Division One:
 * Cornard United

Division One
Division One featured 16 clubs which competed in the division last season, along with three new clubs:
 * Brightlingsea United, transferred from the Essex Senior League
 * Sudbury Town reserves
 * Swaffham Town, joined from the Anglian Combination

Also, Coalite Yaxley changed name to Clarksteel Yaxley.