| Type: | Ortsgemeinde |
| Image Coa: | DEU Rettershain COA.svg |
| Coordinates: | 50.1453°N 7.8331°W |
| Image Plan: | Rettershain in EMS.svg |
| State: | Rheinland-Pfalz |
| District: | Rhein-Lahn-Kreis |
| Verbandsgemeinde: | Nastätten |
| Elevation: | 420 |
| Area: | 4.81 |
| Postal Code: | 56357 |
| Area Code: | 06775 |
| Licence: | EMS, DIZ, GOH |
| Gemeindeschlüssel: | 07 1 41 116 |
| Mayor: | Uwe Jannaschk[1] |
| Leader Term: | 2019 - 24 |
Rettershain is a municipality in the district of Rhein-Lahn, in Rhineland-Palatinate, in western Germany.