O'Dea Castle, also known as Dysert O'Dea Castle, is an Irish fortified tower house, loosely described as a castle at Dysert O'Dea (Irish: Dísert, meaning "hermitage"), the former O'Dea clan stronghold, 5 km from Corofin, County Clare just off the R476 road.[2] It was built between 1470 and 1490 by Diarmaid O'Dea, Lord of Cineal Fearmaic, and stands some 50 feet high on a limestone outcrop base measuring 20 feet by 40 feet.[3] The tower is located right next to Dysert O'Dea Monastery.