| Image Coa: | DEU Balduinstein COA.svg |
| Coordinates: | 50.3444°N 7.9709°W |
| Image Plan: | Balduinstein in EMS.svg |
| State: | Rheinland-Pfalz |
| District: | Rhein-Lahn-Kreis |
| Verbandsgemeinde: | Diez |
| Elevation: | 160 |
| Area: | 5.17 |
| Postal Code: | 65558 |
| Area Code: | 06432 |
| Licence: | EMS, DIZ, GOH |
| Gemeindeschlüssel: | 07 1 41 503 |
| Divisions: | 2 |
| Website: | www.gemeinde-balduinstein.de |
| Mayor: | Maria-Theresia Schmidt[1] |
| Leader Term: | 2019 - 24 |
Balduinstein (pronounced as /de/) is a municipality in the district of Rhein-Lahn, in Rhineland-Palatinate, in western Germany. It belongs to the association community of Diez.