2009–10 Eastern Counties Football League

The 2009–10 season was the 68th in the history of Eastern Counties Football League a football competition in England.

Needham Market 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 19 clubs which competed in the division last season, along with three new clubs, promoted from Division One:
 * Debenham LC
 * Hadleigh United
 * Newmarket Town

Division One
Division One featured 17 clubs which competed in the division last season, along with two new clubs:
 * Team Bury, joined from the Essex and Suffolk Border League
 * Whitton United, demoted from the Premier Division