Książ Śląski (Polish pronunciation: [ˈkɕɔ̃ʂ ˈɕlɔ̃skʲi]) is a village in the administrative district of Gmina Kożuchów, within Nowa Sól County, Lubusz Voivodeship, in western Poland. It lies approximately 9 kilometres (6 mi) north-west of Kożuchów, 12 km (7 mi) west of Nowa Sól, and 14 km (9 mi) south of Zielona Góra.