1999–2000 Eastern Counties Football League

The 1999–2000 season was the 58th in the history of Eastern Counties Football League a football competition in England.

Histon were champions, winning their first Eastern Counties Football League title and were promoted to the Southern Football League for the first time in their history.

Premier Division
The Premier Division featured 20 clubs which competed in the division last season, along with two new clubs, promoted from Division One:
 * Clacton Town
 * Mildenhall Town

Sudbury Town merged with Sudbury Wanderers to form new club AFC Sudbury.

Histon won the league on the last day of the season, coming from behind to win 2-1 win away at Gorleston with Wayne Goddard scoring the winner in the 76th minute. The victory meant that title rivals Wroxham, who still had a game in hand against Warboys Town, could not catch them. Histon's victory gained them promotion to the Southern Football League and also saved Felixstowe Port & Town from relegation as, had Wroxham won, they would not have been promoted.

Division One
Division One featured 16 clubs which competed in the division last season, along with two new clubs:
 * Cambridge City reserves
 * Ely City, relegated from the Premier Division