| Image Coa: | DEU Marxen COA.svg |
| Coordinates: | 53.3167°N 11°W |
| Image Plan: | Marxen in WL.svg |
| State: | Niedersachsen |
| District: | Harburg |
| Samtgemeinde: | Hanstedt |
| Elevation: | 43 |
| Area: | 13.31 |
| Postal Code: | 21439 |
| Area Code: | 04185 |
| Licence: | WL |
| Gemeindeschlüssel: | 03 3 53 024 |
| Divisions: | 2 |
| Mayor: | Christian Jedamski |
Marxen is a municipality in the district of Harburg, in Lower Saxony, Germany.