The 1965–66 Northern Football League season was the 69th in the history of Northern Football League, a football competition in England.[1]
| Competition: | Northern Football League |
| Season: | 1965–66 |
| Winners: | Whitley Bay |
| Matches: | 306 |
| Total Goals: | 1249 |
| Prevseason: | 1964–65 |
| Nextseason: | 1966–67 |
Division One featured 18 clubs which competed in the league last season, no new clubs joined the league this season.