Brian V. Johnstone, C.SS.R. (born December 5, 1938) is a Roman Catholic Redemptorist priest and Moral Theologian. He was born in Brighton, Australia and has taught at Yarra Theological Union, Melbourne; The Catholic University of America, Washington, D.C.; and the Academia Alfonsiana in Rome. He currently resides in Kew, Victoria, Australia where he is preparing a text of moral theology rooted in .