Księżno [ˈkɕɛ̃ʐnɔ] is a village in the administrative district of Gmina Bisztynek, within Bartoszyce County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) south-west of Bisztynek, 23 km (14 mi) south of Bartoszyce, and 37 km (23 mi) north-east of the regional capital Olsztyn.