1851 in Ireland

• 30 March – the United Kingdom Census shows that, as part of the legacy of the Great Famine, the population of Ireland has fallen to 6,575,000 – a drop of 1,600,000 in ten years.{{cite book|first=David|last=Ross|year=2002|title=Ireland: History of a Nation|edition=New|location=New Lanark|publisher=Geddes & Grosset|isbn=1842051644|pages=[https://archive.org/details/irelandhistoryof0000ross/page/216 216, 313]|url-access=registration|url=https://archive.org/details/irelandhistoryof0000ross/page/216}}{{cite book|first=Cormac|last=Ó Gráda|title=Ireland’s Great Famine: Interdisciplinary Perspectives|publisher=University College Dublin Press|year=2006|isbn=1-904558-57-7|page=3}} This is the first census to note use of the Irish language.{{cite book|editor=Moody, T. W.|title=A New History of Ireland. 8: A Chronology of Irish History|publisher=Oxford University Press|year=1989|isbn=978-0-19-821744-2|display-editors=etal}}
• 1 August – Midland Great Western Railway extended from Mullingar to Galway.
• 7 August – Poor Relief (Ireland) Act provides for the establishment of dispensaries.
• Construction of MacNeill's Egyptian Arch, a railway bridge near Newry on the Dublin-Belfast railway line is completed.
• Tillie and Henderson open their first shirt factory in Derry.

• Ancestors of Presidents of the United States Barack Obama and Joe Biden migrate from Ireland to the U.S.{{cite web|title=Remarks by President Biden to the Houses of the Oireachtas|date=2023-04-13|access-date=2023-04-14|publisher=The White House|url=https://bidenwhitehouse.archives.gov/briefing-room/speeches-remarks/2023/04/13/remarks-by-president-biden-to-the-houses-of-the-oireachtas/}}
• Jacob's brand of biscuits, bars and coffee is founded; their first biscuit is possibly Goldgrain.

File:Ireland population change 1841 1851.png]]

• 8 January – William McDonnell, 6th Earl of Antrim, peer (died 1918).
• 14 March – Paddy Ryan, boxer (died 1900).
• 17 March – Ted Sullivan, Major League Baseball player and manager (died 1929 in the United States).
• 21 March – Henry Prittie, 4th Baron Dunalley, peer and Lord Lieutenant of County Tipperary 1905–1922 (died 1927).
• 4 April – James Campbell, 1st Baron Glenavy, lawyer, Lord Chancellor of Ireland, first Chairman of Seanad Éireann (died 1931).
• 22 May – William Moxley, representative from Illinois's 6th congressional district (died 1938 in the United states).
• 4 September – John Dillon, land reform agitator, Irish Home Rule activist, nationalist politician, MP and last leader of the Irish Parliamentary Party (died 1927).
• 3 December – George Noble Plunkett, nationalist, politician, museum curator (died 1948).

• 23 May – Richard Lalor Sheil, politician, writer and orator (born 1791).
• 1 September – Anne Devlin, Irish republican and housekeeper to Robert Emmet (born 1780).

• [http://globalgenealogy.com/countries/ireland/resources/otw-99-2.htm Surviving 1851 Census Returns of Ireland]

• 1851 in Scotland
• 1851 in Wales

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{{Years in Ireland}}

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Category:1850s in Ireland

Ireland

Category:Years of the 19th century in Ireland

Ireland