Książ (formerly known as Schloss Fürstenstein in German) is a castle in northern Wałbrzych, in northern Silesia, Poland.
Książ may also refer to: Książ Landscape Park, a protected area Książ Wielkopolski, a town in west-central Poland Książ Wielki, a village in southern Poland Książ, Kuyavian-Pomeranian Voivodeship (north-central Poland) Książ, Lublin Voivodeship (east Poland) Książ, West Pomeranian Voivodeship (north-west Poland)