Kliment Nikolaevich Red'ko or Redko (Russian: ??????? ?????????? ??????, Ukrainian: ??????? ??????????? ??????, Klyment Mykolayovych Redko), 15 (27) October 1897 - 18 February 1956) was a Ukrainian-Russian painter-scientist, avant-garde artist (Constructivist, Projectionist, Suprematist), graphic artist.