Karl Friedrich Canstatt (11 July 1807 in Regensburg – 10 March 1850 in Erlangen) was a German physician and medical author.
The following year, he went to Paris to study Asiatic cholera, a disease that was then epidemic in the French capital.
Canstatt's study of the disease, published in 1832, attracted the attention of the Belgian government, which commissioned him to take charge in establishment and management of a cholera hospital.
The same year he was appointed physician to the provincial law court at Ansbach, where he stayed until 1843.
Following the death of professor Adolph Henke (1843), he was appointed to the chair of pathology at the University of Erlangen.