2017–18 Northern Football League

The 2017–18 season was the 120th in the history of Northern Football League, a football competition in England. The league has operated two divisions in the English football league system, Division One at step 5, and Division Two at step 6.

The constitution for Step 5 and Step 6 divisions for 2017–18 was announced on 26 May 2017, and fixtures were released on 3 June 2017.

Division One
Division One featured 19 clubs which competed in the division last season, along with three new clubs, promoted from Division Two:
 * Billingham Synthonia
 * Stockton Town
 * Team Northumbria

Division Two
Division Two featured 18 clubs which competed in the division last season, along with three new clubs:
 * Chester-le-Street Town, relegated from Division One
 * Jarrow, promoted from the Wearside League
 * West Allotment Celtic, relegated from Division One

Also, Blyth Town changed name to Blyth.