Yurii Voronyi (also transliterated as Yurii Voronoy; 9 August 1895 – 13 May 1961) was a Ukrainian surgeon. He is known for having performed the first attempt to transplant an internal organ into a living person in 1933, although the recipient died soon after due to transplant rejection, and it took until Joseph E. Murray for a similar operation to be successful. Born in Zhuravka, Voronyi was the son of mathematician Georgy Voronoy. In 1913, he entered the Faculty of Medicine at the Kyiv Imperial University of St. Volodymyr, but interrupted his studies to work as a medic during World War I, and