The 2002–03 Northern Football League season was the 105th in the history of Northern Football League, a football competition in England.[1]
| Competition: | Northern Football League Division One |
| Season: | 2002–03 |
| Winners: | Brandon United |
| Relegated: | Prudhoe Town Consett Newcastle Blue Star |
| Matches: | 420 |
| Total Goals: | 1367 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Division One featured 18 clubs which competed in the division last season, along with three new clubs, promoted from Division Two:
Also, Washington Ikeda Hoover changed name to Washington.
| Competition: | Northern Football League Division Two |
| Season: | 2002–03 |
| Winners: | Penrith |
| Promoted: | Penrith Horden Colliery Welfare Thornaby |
| Relegated: | Eppleton Colliery Welfare |
| Matches: | 380 |
| Total Goals: | 1396 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Division Two featured 17 clubs which competed in the division last season, along with four new clubs, relegated from Division One: