The 1983–84 Northern Football League season was the 86th in the history of Northern Football League, a football competition in England.[1]
| Competition: | Northern Football League Division One |
| Season: | 1983–84 |
| Winners: | Blyth Spartans |
| Relegated: | Ashington Evenwood Town |
| Matches: | 306 |
| Total Goals: | 991 |
| Prevseason: | 1982–83 |
| Nextseason: | 1984–85 |
Division One featured 16 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
| Competition: | Northern Football League Division Two |
| Season: | 1983–84 |
| Winners: | Chester-le-Street Town |
| Promoted: | Chester-le-Street Town Ryhope Community |
| Matches: | 306 |
| Total Goals: | 982 |
| Prevseason: | 1982–83 |
| Nextseason: | 1984–85 |
Division Two featured nine clubs which competed in the division last season, along with nine new clubs.