The 2011–12 Northern Football League season was the 114th in the history of Northern Football League, a football competition in England.
| Competition: | Northern Football League Division One |
| Season: | 2011–12 |
| Winners: | Spennymoor Town |
| Relegated: | Jarrow Roofing Stokesley Sports Club Tow Law Town |
| League Topscorer: | Andrew Johnson (Bishop Auckland) (39 goals)[1] |
| Matches: | 462 |
| Total Goals: | 1664 |
| Prevseason: | 2010–11 |
| Nextseason: | 2012–13 |
Division One featured 19 clubs which competed in the division last season, along with three new clubs, promoted from Division Two:
Also, Stokesley changed back name to Stokesley Sports Club.
| Competition: | Northern Football League Division Two |
| Season: | 2011–12 |
| Winners: | Team Northumbria |
| Promoted: | Gillford Park Hebburn Town Team Northumbria |
| Relegated: | Easington Colliery |
| League Topscorer: | Peter Watling (Team Northumbria) (39 goals)[2] |
| Matches: | 462 |
| Total Goals: | 1792 |
| Prevseason: | 2010–11 |
| Nextseason: | 2012–13 |
Division Two featured 17 clubs which competed in the division last season, along with five new clubs.