The 2003–04 Northern Football League season was the 106th in the history of Northern Football League, a football competition in England.[1]
| Competition: | Northern Football League Division One |
| Season: | 2003–04 |
| Winners: | Dunston Federation Brewery |
| Relegated: | Washington Marske United Penrith |
| Matches: | 420 |
| Total Goals: | 1473 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
Division One featured 18 clubs which competed in the division last season, along with three new clubs, promoted from Division Two:
| Competition: | Northern Football League Division Two |
| Season: | 2003–04 |
| Winners: | Ashington |
| Promoted: | Ashington Newcastle Benfield Saints Consett |
| Relegated: | Shotton Comrades |
| Matches: | 380 |
| Total Goals: | 1323 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
Division Two featured 16 clubs which competed in the division last season, along with four new clubs.