The 2004–05 Northern Football League season was the 107th in the history of Northern Football League, a football competition in England.[1]
| Competition: | Northern Football League Division One |
| Season: | 2004–05 |
| Winners: | Dunston Federation Brewery |
| Relegated: | Consett Peterlee Newtown Guisborough Town |
| Matches: | 420 |
| Total Goals: | 1412 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
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: | 2004–05 |
| Winners: | West Allotment Celtic |
| Promoted: | West Allotment Celtic Washington Nissan Newcastle Blue Star |
| Relegated: | Easington Colliery Willington |
| Matches: | 380 |
| Total Goals: | 1413 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
Division Two featured 15 clubs which competed in the division last season, along with five new clubs.