Červený Hrádek, Protected château in Sedlčany, Czech Republic.

Červený Hrádek is a neo-Gothic castle situated on elevated ground near the town center of Sedlčany. The structure features multiple pointed towers and is surrounded by landscaped gardens that frame the building.

A Gothic fortress with a village was first mentioned in 1285. A fire destroyed it in 1669, and it was rebuilt around 1711. The present appearance dates from 1844–1894, when Jan Nepomuk Mladota had it rebuilt; from 1893 Josef Freyn led the work with student Jan Kotěra, who continued alone after 1895.

The name Červený Hrádek, used since the 16th century under the Břekovec family of Ostromeč, may refer to the red stripes on the roof covering or plaster. The castle is open only occasionally, for concerts or weddings, while the English-style park is freely accessible.

The castle is within walking distance from Sedlčany town center, making it easy to reach on foot. It is advisable to check visiting arrangements beforehand, as conditions may vary depending on the season.

The castle and its park appeared as filming locations in the Czech comedy Trhák, directed by Zdeněk Podskalský in 1980. The grounds are open freely as an English-style park, while the interiors can be seen only during concerts or weddings.