| Hagen | |
| Image Coa: | DEU Hagen aTW COA.svg |
| Coordinates: | 52.1961°N 7.9811°W |
| Image Plan: | Hagen am Teutoburger Wald in OS.svg |
| State: | Niedersachsen |
| District: | Osnabrück |
| Elevation: | 110 |
| Area: | 34.49 |
| Postal Code: | 49170 |
| Area Code: | 05401, 05405 |
| Licence: | OS |
| Gemeindeschlüssel: | 03 4 59 020 |
| Divisions: | 6 Ortsteile |
| Website: | www.hagen-atw.de |
| Mayor: | Christine Möller[1] |
| Leader Term: | 2021 - 26 |
| Party: | CDU |
Hagen (also Hagen am Teutoburger Wald) is a municipality in the district of Osnabrück, in Lower Saxony, Germany. It is situated in the Teutoburg Forest, approx. 10 km southwest of Osnabrück.