1999–2000 Northern Football League

The 1999–2000 Northern Football League season was the 102nd in the history of Northern Football League, a football competition in England.

Division One
Division One featured 17 clubs which competed in the division last season, along with three new clubs, promoted from Division Two:
 * Durham City
 * Peterlee Newtown
 * Shotton Comrades

Also, Stockton changed name to Thornaby-On-Tees.

Division Two
Division Two featured 16 clubs which competed in the division last season, along with three new clubs, relegated from Division One:
 * Newcastle Blue Star
 * Penrith
 * Shildon

Also, Ryhope CA changed name to Kennek Ryhope CA, while Washington changed name to Washington Ikeda Hoover.