Duchcov Chateau (Czech: Zámek Duchcov; German: Schloss Dux) is a manor house in Duchcov in the Ústí nad Labem Region of the Czech Republic. It is protected as a national cultural monument. Today the chateau houses a museum with a collection of historic furniture. Also on display is the painting and portrait gallery of the Waldstein family, including portraits of the most famous member of this family, Albrecht von Wallenstein, Duke of Friedland, by Anthony van Dyck. One room is dedicated to Giacomo Casanova, who was employed here as a librarian from 1785 until his death in 1798, and wrote his memoirs, Histoire de ma vie, here.