Cormac ua Liathain was a 6th-century Irish saint whose life is recorded in the *Vita Columbae* by Adomnan of Iona. He is identified as an anchorite and a founder of monasteries, specifically the monastery of Druim Ceat. The historical accounts focus on his various attempts to find a secluded location for hermit-like prayer, often involving journeys by sea that were foretold by the saint Columba.