The 2011–12 season was the 41st in the history of Essex Senior Football League a football competition in England.
The season featured 18 clubs, 17 of which had competed in the previous season, along with one new club: Also, Mauritius Sports changed their name to Haringey & Waltham Development.
Witham Town were champions, winning their third Essex Senior League title and returned to the Isthmian League after three seasons in the Essex Senior League.