Badenweiler, a health resort and watering place of the grand-duchy of Baden, a portion of Markgräflerland, Germany, 28 m. N. by E. by rail from Basel, at the western edge of the Black Forest. It is sheltered by the Blauen 1164 m (3820 ft) and the climate is excellent. Its parish (Evangelical) church (1897) is built at the foot of the 11th-century castle which belonged to the margraves of Baden, and was destroyed by the French during the wars of Louis XV. The place is visited by 5000 people annually, partly for its warm mineral springs 21 °C (70° F), partly for its whey cure, and partly on account of its equable dimate and picturesque surroundings. There are a Kurhaus, built in 1853, and a park of 15 acres (61,000 m²); also a grand-ducal castle, refitted in 1887-1888. In 1784 well-preserved Roman baths were discovered here. The permanent population is about 600.

Today, Badenweiler is administratively a part of the Breisgau-Hochschwarzwald district of Baden-Württemberg, Germany. It is historically a part of Markgräflerland.