St Margarethen (Hungarian: Szentmargitbánya) is a town in Burgenland near the state capital of Eisenstadt, in Austria. It is home to a large 1st-century Roman quarry. A passion play has been presented in St Margarethen each summer for over seventy years. The town is close to the border with Hungary. The Pan-European Picnic peace demonstration was held near St. Margarethen in 1989 at the close of the Cold War.