Wildenstein Castle (German: Burg Wildenstein) is a ruined hill castle on a hill, 486 m above sea level (NN), 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".

• Wildenstein Castle at pfalzlexikon.de
• Excerprt from the pfälzischen Burgenlexikon (Palatine Castle Lexicon): Burg Wildenstein