Karl Marienus Deichgräber (10 February 1903, Aurich, Province of Hanover – 16 December 1984, Bovenden) was a German classical philologist.
In 1928, Deichgräber earned his doctorate at Münster with a thesis on medical schools during the time of Ancient Greece.
Upon returning to Berlin, he habilitated in 1931, with research of books I and III of the Epidemics by Hippocrates.
In 1935 he was summoned to the University of Marburg as a professor specializing in Hellenistic Greece.
[1] On 25 January 1946, Deichgräber was removed from office, which he felt throughout his life as deeply unfair.