1804 in Ireland

File:Guerilla_warfare_Wexford.jpg faction destroyed]]

• 14 January – Richard Lovell Edgeworth's semaphore line between Dublin and Galway is operational, but is out of use by the end of the year.{{cite journal|first=Adrian James|last=Kirwan|title=R. L. Edgeworth and optical telegraphy in Ireland, c.1790–1805|journal=Proceedings of the Royal Irish Academy|location=Dublin|volume=117C|year=2017|pages=209–35}}
• 11 February – the last armed rebel group of the Society of United Irishmen, led by James Corcoran, is betrayed and killed or captured by yeomen near Enniscorthy.{{cite book|first=Ruan|last=O'Donnell|title=Aftermath: Post-Rebellion Insurgency in Wicklow, 1799–1803|year=2000|isbn=0-7165-2638-7}}
• 4–5 March – Castle Hill convict rebellion in New South Wales led by Irish convicts in Australia.{{cite web|title=Castle Hill convict rebellion 1804|url=http://www.dictionaryofsydney.org/entry/castle_hill_convict_rebellion_1804|first=Anne-Maree|last=Whitaker|work=Dictionary of Sydney|access-date=2013-03-03}}
• April – first boat passes through the Grand Canal throughout between the River Liffey in Dublin and the River Shannon.{{cite book|first=Ruth|last=Delany|title=A celebration of 250 years of Ireland's Inland Waterways|location=Belfast|publisher=Appletree Press|year=1988|isbn=0-86281-200-3|page=87}}
• 14 May – Cork Street Fever Hospital, Dublin, opens in Cork Street, Dublin.
• First Martello Tower erected in Ireland, at Sutton, Dublin.{{cite web|title=History|url=http://www.martellotowersutton.com/Tower_History-Origins.html|archive-url=https://web.archive.org/web/20100210013758/http://www.martellotowersutton.com/Tower_History-Origins.html|url-status=dead|archive-date=February 10, 2010|work=Martello Tower Sutton|access-date=2012-04-25}}

File:Killiney Martello No7.jpg (South No.7) at Killiney]]

• Early February – James Bronterre O'Brien, Chartist leader, reformer and journalist (died 1864).
• 4 April – Andrew Nicholl, painter (died 1886).
• 7 April – James Emerson Tennent, politician and traveller (died 1869).
• 18 November – John George, politician, judge and in 1859 Solicitor-General for Ireland (died 1871).
• 25 December – Frederic Trench, 2nd Baron Ashtown, peer (died 1880).
• 26 December – Sir Joseph Napier, 1st Baronet, Conservative Party MP and Lord Chancellor of Ireland (died 1882).
• 31 December – Francis Sylvester Mahony, humorist and poet (a.k.a. Father Prout) (died 1866).

• February – James Corcoran, rebel leader (born c.1770).
• 27 July – Robert Clements, 1st Earl of Leitrim, politician (born 1732).

• 1804 in Scotland
• 1804 in Wales

{{reflist}}

{{Years in Ireland}}

{{DEFAULTSORT:1804 In Ireland}}

Category:Years of the 19th century in Ireland

Category:1800s in Ireland

Ireland

Ireland