The 1956–57 Northern Football League season was the 59th in the history of the Northern Football League, a football competition in Northern England.[1]
| Competition: | Northern League |
| Season: | 1956–57 |
| Winners: | Billingham Synthonia |
| Matches: | 182 |
| Total Goals: | 816 |
| Prevseason: | 1955–56 |
| Nextseason: | 1957–58 |
The league featured 14 clubs which competed in the last season, no new clubs joined the league this season.