Žatec (Czech pronunciation: [ˈʒa.tɛt͡s]; German: Saaz) is a town in Louny District in the Ústí nad Labem Region of the Czech Republic. It has about 19,000 inhabitants. It lies on the Ohře River in the Most Basin. Žatec became a town in the 13th century. The town is famous for an over-700-year-long tradition of growing Saaz noble hops used by several breweries. Žatec and the Landscape of Saaz Hops was included in the UNESCO World Heritage List in 2023. The historic town centre is well preserved and is protected as an urban monument reservation and partly also as an urban monument zone. Among the main landmarks of Žatec is the Church of the Assumption of the Virgin Mary.