| Coordinates | 53°19′N 10°01′E |
|---|---|
| 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.