| Scharfenstein Castle | |
| Native Name: | Burg Scharfenstein |
| Location: | Kiedrich |
| Type: | Medieval castle |
| Coordinates: | 50.0477°N 8.0815°W |
Scharfenstein Castle (German: Burg Scharfenstein), a ruined castle near the town of Kiedrich in Hesse, Germany, was part of the Bishopric of Mainz's border fortifications. It was erected in 1160 under Christian I (Archbishop of Mainz).