Emanuel Mendel (October 28, 1839 – June 23, 1907) was a German neurologist and psychiatrist who was a university professor and director of a polyclinic in Berlin. He was born in Bunzlau, Lower Silesia; (today known as Bolesławiec, Poland).
He studied medicine in Berlin and in 1873 received his habilitation. He was founder and publisher of the neurological/psychiatric magazine Neurologisches Centralblatt. Mendel was an advocate concerning the unification of psychiatry and neurology as complementary disciplines. Among his better-known students and assistants were Max Bielschowsky (1869-1940), Edward Flatau (1869-1932), Lazar Minor (1855-1942) and Louis Jacobsohn-Lask (1863-1940)
Mendel is remembered for the introduction of duboisine as a treatment for Parkinson's disease. Duboisine is an extract from the Australian plant Dubosia myoporoides. He also conducted important studies of epilepsy and progressive paralysis.
Among his medical writings was a textbook on psychiatry titled Leitfaden der Psychiatrie für Studirende der Medicin (1902), which was later translated into English and published as "A Psychological Study of Insanity for Practitioners and Students". He was also interested in politics, and was a member of the Reichstag from 1877 to 1881.