Burg Badenweiler, Medieval castle ruins in Badenweiler, Germany.

Burg Badenweiler is a hilltop ruin at 454.6 m above sea level, reached by a steep wall-lined path that passes a round tower. In the northeast, the three-part palas shows the building was multi-storey, with surviving window shapes. The bergfried is climbable as a viewing platform over Badenweiler, the Black Forest and the Rhine plain.

The castle was first documented in 1122 as a fortress of the House of Zähringen. In 1503 it came under the control of the margraves of Baden, marking a shift in regional influence.

The castle hill is part of the Kurpark, and its slopes hold several monuments: a statue of Grand Duke Friedrich I of Baden (1912, by Karl Friedrich Moest), who celebrated his 80th birthday in Badenweiler in 1906, and a memorial to Anton Chekhov, who died in the town in 1904. Nearby are a Hildegard von Bingen garden of medicinal plants and a Gutedel vineyard garden.

The grounds are accessible without charge during daylight hours and can be explored independently. Parking is available in a nearby structure for a fee, with a comfortable walking path leading from the lot to the castle.

The hilltop was settled before 1122: excavations found that the Romans built a fort here to protect Aqua Villa, and the Alamanni later raised a hill castle, which the Franks took over. The keep now serves as a viewing platform over Badenweiler, the Black Forest and the Rhine plain.