Červený Hrádek is a place, that after the Treaty of Saint-Germain belonged to Czechoslovakia and was situated in the administrative region Plzeň.
Červený Hrádek was formerly part of the German Empire. In the German Empire, the place was called Červený Hrádek. The place is now called Červený Hrádek (Plzeň-Červený Hrádek) and belongs to Czech Republic.