Louis Guillaume Joseph Doutrelepont (3 June 1834, Malmedy – 30 April 1918, Bonn) was a German surgeon and dermatologist.
In 1858 he received his medical doctorate in Berlin, then furthered his education at the University of Bonn as a student of surgeon Wilhelm Busch.
In 1863 he obtained his habilitation for surgery and ophthalmology, and in 1869 was named an associate professor.
[1] From 1882 onward, he dedicated himself entirely to studies of skin and venereal diseases.
He is especially known for his research involving the etiology and treatment of lupus vulgaris.