Martyniuk (Polish), Мартинюк (Ukrainian, transcribed as Martynyuk), or Мартынюк (Russian, transcribed as Martynyuk) is a patronimical surname of Ukrainian origin, it means son of Martyn.
Alexander Martynyuk (1945–2022), ice hockey player who played for the Soviet Hockey League
Dave Martyniuk, fictional character in Guy Gavriel Kay's fantasy trilogy "The Fionavar Tapestry"