Platon Hryhorovych Kostiuk (Ukrainian: Платон Григорович Костюк; 20 August 1924 – 10 May 2010) was a Soviet and Ukrainian physiologist, neurobiologist, electrophysiologist, and biophysicist. He was a member (academician) of the National Academy of Sciences (NAS) of Ukraine and the Russian Academy of Sciences. He was also a director of the Bogomoletz Institute of Physiology and the International Center of Molecular Physiology NAS of Ukraine; chair of the Moscow Institute of Physics and Technology, Kyiv branch, vice-president of the NAS of Ukraine, and chairman of the Verkhovna Rada of the Ukrai