| Marienhausen | |
| Image Coa: | DEU Marienhausen COA.svg |
| Coordinates: | 50.5639°N 7.6928°W |
| Image Plan: | Marienhausen in NR.svg |
| State: | Rheinland-Pfalz |
| District: | Neuwied |
| Verbandsgemeinde: | Dierdorf |
| Elevation: | 270 |
| Area: | 4.84 |
| Postal Code: | 56269 |
| Area Code: | 02689 |
| Licence: | NR |
| Gemeindeschlüssel: | 07 1 38 201 |
| Website: | www.marienhausen.de |
| Mayor: | Maximilian Seidel[1] |
| Leader Term: | 2019 - 24 |
| Bürgermeistertitel: | Ortsbürgermeister |
Marienhausen is a municipality in the district of Neuwied, in Rhineland-Palatinate, Germany.