Murrisk Friary (Irish: Mainistir Mhuraisce),[1] is a ruined Augustinian monastery located in County Mayo, Ireland.

The abbey was likely founded by an Ó Máille, one of the Kings of Umhaill, in either the 14th or 15th century,[2] potentially in 1457.

[3] Lands were granted by Thady O'Malley in 1457 to Hugh O'Malley of Banada Friary, County Sligo who was granted permission by Callixtus III to establish a church and priory at Croagh Patrick because "the inhabitants of those parts have not hitherto been instructed in their faith.

[5] All that is left of Murrisk Abbey today are ruins consisting of a church with one central aisle (with battlemented walls and a fine east window), and the east wing of the Friary buildings.

Behind the main altar space, the east window is the finest feature of the ruins.