The 2004–05 season was the 63rd in the history of Eastern Counties Football League a football competition in England.
[1] AFC Sudbury were champions, winning their fifth Eastern Counties Football League title in a row after the new club was formed in 1999.
The Premier Division featured 19 clubs which competed in the division last season, along with three new clubs, promoted from Division One: Division One featured 16 clubs which competed in the division last season, along with four new clubs: