The 1919–20 Northern Football League season was the 27th in the history of the Northern Football League, a football competition in Northern England. South Bank were crowned champions via a three team playoff after they finished the season on 38 points along with Bishop Auckland and Crook Town.
| Competition: | Northern League |
| Season: | 1919–20 |
| Winners: | South Bank |
| Matches: | 182 |
| Total Goals: | 670 |
| Prevseason: | 1914–15 |
| Nextseason: | 1920–21 |
From the 13 clubs which competed in the 1914–15 season 4 did not reappear:
Also 5 new clubs joined the league: