Teschen may refer to:Cieszyn, Poland, known as Teschen in German Český Těšín, Czech Republic, a city split off from Cieszyn in 1920 Cieszyn Silesia, a geographic region spanning the Czech-Polish border Duchy of Teschen, a historical region in Central Europe Flag of the Duchy of Teschen Teschen disease, a viral disease named after the town Cieszyn Silesian dialect, a West Slavic dialect spoken in Cieszyn Silesia