Ivan Sleziuk is one of the Ukrainian martyrs from the Soviet era persecution of the Church. He was born January 14, 1896, ordained priest in 1923 and ordained bishop in April 1945. Arrested in June 1945 and sentenced to 10 years in a labor camp and then after a release was arrested a second time and sent to a prison camp for another 5 years being released in 1968. Bishop Ivan died on December 2, 1973.

Bishop Ivan Sleziuk was beatified by Pope John Paul II on 27 June 2001 in Ukraine.