The 2005–06 season was the 35th in the history of Essex Senior Football League a football competition in England.[1]
The league featured 14 clubs which competed in the league last season, along with two new clubs:
New phoenix club AFC Hornchurch were champions, winning their first Essex Senior League title and were promoted to the Istmian League along with Tilbury, who left the league at the first attempt and Waltham Abbey, who were promoted to the Isthmian League for the first time in their history. Three clubs were promoted due to creation of the new eighth level division under Isthmian League.
| Competition: | Essex Senior Football League |
| Season: | 2005–06 |
| Winners: | AFC Hornchurch |
| Promoted: | AFC Hornchurch Waltham Abbey Tilbury |
| Matches: | 240 |
| Total Goals: | 741 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |