| Image Coa: | Wappenmellinghausen.png |
| Coordinates: | 52.7°N 62°W |
| Image Plan: | Mellinghausen in DH.svg |
| State: | Niedersachsen |
| District: | Diepholz |
| Samtgemeinde: | Siedenburg |
| Elevation: | 44 |
| Area: | 24.41 |
| Postal Code: | 27249 |
| Area Code: | 04272 |
| Licence: | DH |
| Gemeindeschlüssel: | 03 2 51 027 |
| Divisions: | 3 Ortsteile |
| Website: | www.siedenburg-online.de |
| Mayor: | Heiner v.d. Behrens |
| Party: | SPD |
Mellinghausen is a municipality in the district of Diepholz, in Lower Saxony, Germany.