Yakiv Yaroslav Tymchuk, O.S.B.M. (Ukrainian: Яків Ярослав Тимчук; 24 August 1919 – 20 December 1988) was a Ukrainian Greek Catholic clandestine hierarch. He was an auxiliary bishop of the Ukrainian Catholic Eparchy of Ivano-Frankivsk from 1977 to 1988.

Born in Duplyska, Second Polish Republic (present-day – Ternopil Oblast, Ukraine) in 1919 and in 1934 joined the religious Order of Saint Basil the Great.^[1] He was professed on 31 March 1936, solemn professed on 27 September 1942 and was ordained a priest on 3 January 1943 by Blessed Bishop Hryhorij Lakota. After ordination he served a short time in the monastery in Hoshiv and then as parish priest in Chortkiv.^[1] He was arrested, because the Communist regime abolished the Greek-Catholic Church, but after short time released from prison and clandestinely continued to serve as priest.^[1]

On 1977 Fr. Tymchuk was consecrated to the Episcopate as auxiliary bishop. The principal and single consecrator was clandestine bishop Sofron Dmyterko.^[2]

He died on 20 December 1988.

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