1899–1900 Northern Football League

The 1899–1900 Northern Football League season was the eleventh in the history of the Northern Football League, a football competition in Northern England.

Division One
The division featured 7 clubs which competed in the last season, along with two new clubs, promoted from last seasons's Division Two:
 * Stockton St. John's
 * Thornaby Utopians

Division Two
The division featured 7 clubs which competed in the last season, along with three new clubs:
 * Dorman, Long & Co.
 * Grangetown Athletic
 * Whitby