Dermot O'Cleary, O.F.M. or Dermitius Oclieria (died 1575) was a Roman Catholic prelate who served as Bishop of Mayo (1574–1575). Biography Dermot O'Cleary was ordained a priest in the Order of Friars Minor. On 12 February 1574, he was appointed during the papacy of Pope Gregory XIII as Bishop of Mayo. On 12 March 1574, he was consecrated bishop by Giulio Antonio Santorio, Cardinal-Priest of San Bartolomeo all'Isola, with Giovanni Battista Santorio, Bishop of Alife, and Giuseppe Pamphilj, Bishop of Segni, serving as co-consecrators. He served as Bishop of Mayo until his death in 1575. References 17th-century Roman Catholic bishops in Ireland Bishops appointed by Pope Gregory XIII 1575 deaths Irish Friars Minor Franciscan bishops Bishops of Mayo