The 2003–04 season was the 33rd in the history of Essex Senior Football League a football competition in England.[1]
The league featured 15 clubs which competed in the league last season, along with one new club:
Concord Rangers were champions, winning their second Essex Senior League title, while Ilford were promoted to the Isthmian League.
| Competition: | Essex Senior Football League |
| Season: | 2003–04 |
| Winners: | Concord Rangers |
| Promoted: | Ilford |
| Matches: | 240 |
| Total Goals: | 784 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |