| Native Name: | Burg Wildenstein |
| Built: | c. 1200 |
| Type: | hill castle, motte |
| Condition: | wall remains |
| Location: | Dannenfels |
| Occupants: | free nobility |
| Coordinates: | 49.6142°N 7.9249°W |
| Map Type: | Rhineland-Palatinate#Germany |
| Code: | DE-RP |
Wildenstein Castle (German: Burg Wildenstein) is a ruined hill castle on a hill,, in the Wildenstein valley (Wildensteiner Tal), hidden in a wood at the foot of the Donnersberg near Dannenfels in the county of Donnersbergkreis in the German state of Rhineland-Palatinate.
The castles is of the motte and bailey type. Together with the three other ruined castles of Falkenstein, Hohenfels and Tannenfels, it forms the ring of the "Donnersberg Castles".[1]