| Image Coa: | Wappen Mammelzen.png |
| Coordinates: | 50.7018°N 7.6678°W |
| Image Plan: | Mammelzen in AK.svg |
| State: | Rheinland-Pfalz |
| District: | Altenkirchen |
| Verbandsgemeinde: | Altenkirchen-Flammersfeld |
| Elevation: | 240 |
| Area: | 4.12 |
| Postal Code: | 57636 |
| Area Code: | 02681 |
| Licence: | AK |
| Gemeindeschlüssel: | 07 1 32 067 |
| Mayor: | Dieter Rütscher[1] |
| Leader Term: | 2019 - 24 |
Mammelzen is a municipality in the district of Altenkirchen, in Rhineland-Palatinate, in western Germany.