Saint Laisrén mac Nad Froích (died 564), or Laisrén of Devenish and Lasserian, also known by his petname Mo Laisse, was the patron saint of Devenish Island in Lough Erne, near Enniskillen, County Fermanagh, Northern Ireland, in the present diocese of Clogher. Laisrén is the subject of both a Latin and an Irish Life, which offer loose narratives in which a number of miscellaneous anecdotes and miracles have been grouped together.