Maurice FitzGerald Day (20 May 1816 – 13 December 1904) was a Church of Ireland bishop in the last quarter of the 19th century.Handbook of British Chronology by Fryde, E. B;. Greenway, D.E; Porter, S; Roy, I: Cambridge, CUP, 1996, , 9780521563505Exact date of birth is noted on his memorial plaque in Christ Church Cathedral, Waterford.
Day was born at Kiltallagh, County Kerry, to J. Day, rector of Kiltallagh, and his wife Arabella, daughter of Sir William Godfrey. He was educated at Clonmel Endowed School and Trinity College, Dublin"Alumni Dublinenses : a register of the students, graduates, professors and provosts of Trinity College in the University of Dublin (1593–1860George Dames Burtchaell/Thomas Ulick Sadleir p218: Dublin, Alex Thom and Co, 1935 and ordained in 1840. He established and was the incumbent of St. Matthias' Church, Hatch Street, Dublin from 1843 to 1868"Who was Who" 1897-1990 London, A & C Black, 1991 when he became Dean of Limerick.A New History of Ireland by Theodore William Moody, F. X. Martin, Francis John Byrne, Art Cosgrove: Oxford, Oxford University Press, 1976 He was Bishop of Cashel, Emly, Waterford and Lismore from 1872The Times, Friday, Mar 22, 1872; pg. 11; Issue 27331; col D News in Brief until his retirement in 1899."The Clergy List, Clerical Guide and Ecclesiastical Directory" London, John Phillips, 1900 He died on 13 December 1904, in Greystones, County Wicklow.
Day married Jane (Gabbett) Day on 29 July 1852, in Bray, County Wicklow, and they had one son, the Rev. Maurice William Day(1858 - 1916).
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