Dermot O'Dwyer

Most Reverend Dermot O'Cleary
Bishop of Mayo
Church	Catholic Church
Archdiocese	Diocese of Mayo
In office	1574-1575
Successor	Patrick O’Healy
Orders
Consecration	12 March 1574 by Giulio Antonio Santorio
Personal details
Died	1575 County Mayo, Ireland

Dermot O’Cleary, O.F.M. or Dermitius Oclieria (died 1575) was a Roman Catholic prelate who served as Bishop of Mayo (1574-1575).

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.