2005–06 Eastern Counties Football League

The 2005–06 season was the 64th in the history of Eastern Counties Football League a football competition in England.

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.

Premier Division
The Premier Division featured 19 clubs which competed in the division last season, along with three new clubs, promoted from Division One:
 * Ipswich Wanderers
 * Kirkley
 * Needham Market

Division One
Division One featured 17 clubs which competed in the division last season, along with five new clubs:
 * Debenham LC, joined from the Suffolk and Ipswich League
 * Fulbourn Institute, joined from the Cambridgeshire League
 * Gorleston, relegated from the Premier Division
 * Great Yarmouth Town, relegated from the Premier Division
 * Stowmarket Town, relegated from the Premier Division