Donat O'Gallagher

Most Reverend Donat O'Gallagher
Bishop of Down and Connor
Church	Catholic Church
Diocese	Diocese of Down and Connor
In office	1580-1581
Predecessor	Miler Magrath
Successor	Conor O'Devany
Orders
Consecration	5 Nov 1570 by Thomas Goldwell
Personal details
Died	1581
Previous post	Bishop of Killala (1570-1580)

Donat O'Gallagher (died 1581) was a Roman Catholic prelate who served as Bishop of Down and Connor (1580-1581) and Bishop of Killala (1570-1580).

Donat O'Gallagher was ordained a priest in the Order of Friars Minor. On 4 September 1570, he was appointed during the papacy of Pope Pius V as Bishop of Killala. On 5 November 1570, he was consecrated bishop by Thomas Goldwell, Bishop of Saint Asaph, with William Chisholm, Bishop Emeritus of Dunblane, and Giuseppe Pamphilj, Bishop of Segni serving as co-consecrators. On 23 March 1580, he was appointed during the papacy of Pope Gregory XIII as Bishop of Down and Connor. He served as Bishop of Down and Connor until his death in 1581.