Clare Island Abbey, officially St. Brigid's Abbey, is a former Cistercian monastery and National Monument located in Clare Island, County Mayo, Ireland.

It contains numerous tombs of the local ruling family, the Ó Máille (O'Malley) and tradition claims it as the site of the baptism, marriages and burial of Gráinne "Grace" O'Malley (c. 1530 – c. 1603), the famous "pirate queen."

[citation needed] The abbey is furnished with piscina, sedilia, carved heads and ogee and cusp-headed lancet windows.

[4] [5] Clare Island Abbey contains a series of medieval wall and ceiling paintings.

They depict mythical, human and animal figures including dragons, a cockerel, stags, men on foot and on horseback, a harper, birds and trees.