O'Heyne's Church is a historic church building from the late 12th or early 13th century. It is part of the Kilmacduagh Monastery complex. The church was built in the so-called 'School of the West' style, a late Romanesque architectural movement characteristic of the west of Ireland. The church was likely built by Owen O’Heyne and possibly served as the focal point of an Augustinian abbey on the site.