Ortenberg Castle, Medieval castle in Ortenau, Germany.

Ortenberg Castle is a stone fortress rising on a hilltop at the end of the Kinzig Valley between Offenburg and Gengenbach. The structure features medieval walls and offers views across the surrounding farmland and forests from its elevated position.

The House of Zähringen built the castle in the 11th or 12th century to protect the Kinzig Valley. Under the Hohenstaufen it housed the bailiffs of Ortenau and served as a tax, court and customs centre. French troops under Marshal François de Créquy destroyed it in 1678, and after a second destruction in 1697 the bailiff Franz de Neveu moved the seat to Offenburg. Baron Gabriel Leonhard von Berckholtz had Friedrich Eisenlohr rebuild it in Gothic style on the medieval ruins between 1838 and 1843; it has been a youth hostel since 1942.

The Malerturm, a 15th-century powder tower, now serves as the town of Ortenberg's wedding room. It once housed the studio of painter Alexandra von Berckholtz, daughter of the castle's 19th-century builder. The Schimmelturm, the highest tower, can be climbed as a lookout; its name derives from Middle High German for "main".

The castle is reached on foot from Ortenberg, and the Schimmelturm can be climbed as a lookout tower. The site now operates as a youth hostel, so parts of the building are in accommodation use. The towers were restored in stages: the Malerturm in 1984–1985, the Schimmelturm and Jakobsturm in 1986–1988.

The Malerturm was originally built as a powder storage tower but later transformed into a ceremonial wedding space. Today it functions as a cherished location where couples celebrate their marriages within the castle's historic walls.