Chojnik Castle (German: Kynast, 1945–1948 Polish: Chojnasty) is a castle located above the town of Sobieszów, today part of Jelenia Góra in southwestern Poland. Its remains stand on top of the Chojnik hill (627 m (2,057 ft)) within the Karkonosze National Park, overlooking the Jelenia Góra valley.