John the Violent (Greek: Ιωάννης ο Βίαιος, Ioannis o Viaios) is a 1973 black and white Greek film starring Manolis Logiadis in his role as Ioannis Zachos, a young psychopath who murders a woman in Athens. The award-winning film was directed by Tonia Marketaki. The film impressed the audience at the Thessaloniki film festival upon its release in 1973 where it was awarded three of the top prizes. The film is based on an actual murder which happened in Athens in the 1960s and created a media sensation at the time.