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.
| Competition: | Eastern Counties Football League Premier Division |
| Season: | 2004–05 |
| Winners: | AFC Sudbury |
| Relegated: | Gorleston Great Yarmouth Town Stowmarket Town |
| Matches: | 462 |
| Total Goals: | 1661 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The Premier Division featured 19 clubs which competed in the division last season, along with three new clubs, promoted from Division One:
| Competition: | Eastern Counties Football League Division One |
| Season: | 2004–05 |
| Winners: | Ipswich Wanderers |
| Promoted: | Ipswich Wanderers Kirkley Needham Market |
| Matches: | 380 |
| Total Goals: | 1326 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
Division One featured 16 clubs which competed in the division last season, along with four new clubs: