Ivan Sleziuk was a Ukrainian Greek Catholic bishop who lived from 1896 to 1973. Born in the village of Zhyvachiv within the Austro-Hungarian Empire, he entered the priesthood in 1923 following his seminary studies. He was later consecrated as a coadjutor bishop in 1945 to ensure leadership continuity. His religious service was heavily interrupted by repeated arrests and deportations to Soviet labor camps, where he endured significant hardship during his life in the Soviet Union.