Henri-Alexandre Danlos (26 March 1844 – 12 September 1912) was a French physician and dermatologist born in Paris.
With Danish dermatologist Edvard Ehlers (1863-1937), the Ehlers–Danlos syndrome is named, which is a group of inherited connective-tissue disorders.
He studied medicine in Paris, and during the early part of his career, performed research in the laboratory of Charles-Adolphe Wurtz (1817-1884).
In 1895, he received an appointment at the HĂ´pital Saint-Louis.
Danlos was pioneer in the use of radium for treatment of lupus erythematosus of the skin, and in 1901 with physicist Eugène Bloch (1878-1944), he was the first to apply radium on tuberculous skin lesions.