Varnsdorf  is a town in the Ústí nad Labem Region of the Czech Republic.  It lies under the Lussatian Mountains (Lužické hory) in the basin of the Mandava river. From three cardinal points it is surruonded by the frontier line with the Federal Republic of Germany.

The village of Warnsdorf was first recorded in the fourteenth century, and it united with nearby villages in 1849 to form the largest village in the Austrian Empire. It was made a town in 1868. The town was one of the early sites of Old Catholic Church, and an Old Catholic cathedral remains a tourist attraction.

Following the end of World War II, its ethnic German population was mostly expelled to Germany, and the official spelling of its name was changed from the German „Warnsdorf“ to the Czech „Varnsdorf“.Around 2500 buddhist Vietnamese live in and around Varnsdorf, the city hosts the first buddhist temple in Czech Republic.Varnsdorf is also home to the Kocour Brewery, who make a range of ales, including American style IPA and a stout.