Bishop Severian Stefan Yakymyshyn, O.S.B.M. (Ukrainian: Северіян Стефан Якимишин; 22 April 1930 – 6 September 2021) was a Canadian Ukrainian Greek Catholic hierarch. He served as an Eparchial Bishop of Ukrainian Catholic Eparchy of New Westminster from 5 January 1995 until his retirement 1 June 2007.