Drumacoo is a medieval ecclesiastical site and National Monument located in County Galway, Ireland.

[1] Drumacoo is located 1.5 km (0.93 mi) north of Ballinderreen, to the east of Galway Bay.

The monastic settlement at Drumacoo was founded in the 6th century by Sárnait (Sourney, Sairnait, Surney, Sorney), a female saint and associate of Colman mac Duagh.

[5] According to the Annals of Loch Cé, in 1232, "Fachtna Ó hAllgaith, comarb of Druim-mucadha, and official of Uí-Fiachrach; keeper of a house of hospitality for guests and invalids; and the promoter of learning and improver of country and land, in hoc anno quievit."

(in this year rested, i.e. died)[6][7] In 1830, the Gothic Revival mausoleum of the St George family was built onto the stone church.