Dominick O'Brien, DD (b & d Waterford 5 July 1798 - 12 JUne 1873) was an Irish Roman Catholic clergyman who served as the Bishop of Waterford and Lismore from 1887 until his death.
Life O'Brien was educated at St John's College, Waterford and Propaganda Fide. He was on the staff of St John's from 1826 until 1853, then parish priest of St Patrick, Waterford. He was ordained Bishop of Waterford and Lismore on 30 September 1855, A New History of Ireland, volume IX, pp. 368–370. and served until his death.
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