Badenweiler (High Alemannic: Badewiler) is a health resort and spa in the Breisgau-Hochschwarzwald district of Baden-Württemberg, Germany, historically in the Markgräflerland.

[clarification needed] Its parish (Evangelical) church (1897) was built at the foot of an 11th-century castle which belonged to the margraves of Baden and was destroyed by the French during the wars of Louis XV.

Many visitors come to Badenweiler for the warm mineral springs, with temperatures of 21 °C (70 °F), others for its whey cure, and still others on account of its equable climate and picturesque surroundings.

There is a Kurhaus and a park of 15 acres (61,000 m2) containing a historic arboretum (the Staatliche Baderverwaltung Badenweiler), as well as a grand-ducal castle.

The temple builders drove sharpened oak piles into the loamy soil to secure the ground for this heavy building.

From Badenweiler, Chekhov wrote outwardly jovial letters to his sister Masha describing the food and surroundings.

The American poet, novelist, and journalist Stephen Crane died there on 15 June 1900 of tuberculosis.