Karl Ewald Hasse (23 June 1810 – 26 September 1902) was a German physician and professor of special pathology, born in Dresden.

[1] Hasse studied medicine at the medical-surgical academy in Dresden and at University of Leipzig, earning his doctorate in 1833.

Among his written works was "Anatomische Beschreibung der Krankheiten der Circulations- und Respirations-Organe", a book that was translated into English by William Edward Swaine and published in 1846 as "An anatomical description of the diseases of the organs of circulation and respiration".

He was instrumental in the decision by the Swiss psychiatrist and pioneer of psychosurgery, Gottlieb Burckhardt, to enter the medical field of nervous diseases.

Nancy Thorndike Greenspan (2005) "The end of the certain world: the life and science of Max Born".