Červený Hrádek is a place, that before the Treaty of Saint-Germain belonged to Austro-Hungary and was situated in the administrative region Komotau.
Červený Hrádek was formerly part of the German Empire. In the German Empire, the place was called Rothenhaus. The place is now called Červený Hrádek (Jirkov-Červený Hrádek) and belongs to Czech Republic.