Vasily Iakovlevich Danilewsky (variously spelled Vasili Yakovlevich Danilewsky or Vasili Yakolevich Danilevski or Vasily Yakovlevich Danilevsky, Ukrainian: Василь Якович Данилевський) (January 25 [O.S. January 13] 1852 – 25 February 1939) was a Ukrainian physician, physiologist and parasitologist. He was professor of physiology at University of Kharkiv and then at Kharkiv Medical Institute. He helped to establish the Danilevsky Institute of Endocrine Pathology Problems, which he directed until his death. Danilewsky made important works in physiology, particularly in neurobiology. He was the fi