| Ernst Poertgen | |
| Birth Date: | 25 January 1912 |
| Birth Place: | Essen, Germany |
| Position: | Forward |
| Youthyears1: | 1925–1930 |
| Youthclubs1: | BV Altenessen |
| Years1: | 1930–1933 |
| Clubs1: | Schwarz-Weiß Essen |
| Years2: | 1933 |
| Clubs2: | 1. FC Nürnberg |
| Years3: | 1934–1938 |
| Clubs3: | Schalke 04 |
| Years4: | 1938–1940 |
| Clubs4: | Bonner SC |
| Years5: | 1941–1942 |
| Clubs5: | Wacker München |
| Years6: | 1946–1952 |
| Clubs6: | Bonner SC |
| Nationalyears1: | 1935–1937 |
| Nationalteam1: | Germany |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 5 |
Ernst Poertgen (25 January 1912 – 30 November 1986) was a German footballer who played as a forward for Schwarz-Weiß Essen, 1. FC Nürnberg, Schalke 04, Bonner SC and Wacker München. He also represented the Germany national team, earning three caps between 1935 and 1937 and scoring five goals,[1] including a hat trick in a 7–2 win against Luxembourg in September 1936.[2]