Klášterec nad Ohří Castle (Czech: zámek Klášterec nad Ohří) is a Baroque stylecastle in Klášterec nad Ohří in the Ústí nad Labem Region of the Czech Republic. It is located on the left bank of the Ohře River. The castle complex, acquired in 1621 by the Thun und Hohenstein family, is a prominent landmark in the town's recently restored historic urban conservation area.