Dysert O'Dea Church (Irish: Díseart Uí Dheá - "the hermitage of Deá") near Corofin in County Clare, Ireland stands on the site of an early Christian monastery which was reportedly founded by St. Tola in the 8th century.

[1] The church stands on the site of the original monastery, reportedly founded by St. Tola in the 8th century.

The ruined Romanesque structure visible today mainly dates to the 12th century and is over 30 metres long.

The stone arch, showing twelve human and seven animal heads, also dates to the 13th century.

There are many more historical sites in the immediate vicinity including O'Dea Castle, two ring forts, the remains of a fulacht fiadh, and the ruins of a stone Victorian house dating from 1861.

Church, round tower and high cross are today a National Monument of Ireland.