The 2005–06 season was the 64th in the history of Eastern Counties Football League a football competition in England.[1]
Lowestoft Town were champions, winning their eleventh Eastern Counties Football League title, while Bury Town were promoted after ten seasons in the Eastern Counties Football League along with AFC Sudbury.
| Competition: | Eastern Counties Football League Premier Division |
| Season: | 2005–06 |
| Winners: | Lowestoft Town |
| Promoted: | Bury Town AFC Sudbury |
| Matches: | 462 |
| Total Goals: | 1661 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
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: | 2005–06 |
| Winners: | Stanway Rovers |
| Promoted: | Felixstowe & Walton United Stanway Rovers |
| Matches: | 462 |
| Total Goals: | 1566 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
Division One featured 17 clubs which competed in the division last season, along with five new clubs: