Ennis, county town (seat) of County Clare, Ireland, on the River Fergus. Incorporated in 1612, it is now controlled by an urban district council. A Franciscan abbey, founded about 1242, is a national monument. Ennis, on the main road between Limerick and Galway, is the principal rail and road junction of County Clare and has flour mills and textile, imitation jewelry, electronics, and engineering industries. Pop. (2006) 20,142; (2010) 20,180.