1804 in Ireland

Centuries:	17th; 18th; 19th; 20th; 21st;
Decades:	1780s; 1790s; 1800s; 1810s; 1820s;
See also:	1804 in the United Kingdom; Other events of 1804 ; List of years in Ireland

Events from the year 1804 in Ireland.

Events

11 February – last surviving 1798 rebellion 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.^[1]
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.^[2]
4–5 March – Castle Hill convict rebellion in New South Wales led by Irish convicts in Australia.^[3]
April – first boat passes through the Grand Canal throughout between the River Liffey in Dublin and the River Shannon.^[4]
14 May – Cork Street Fever Hospital, Dublin, opens in Cork Street, Dublin.
First Martello Tower erected in Ireland, at Sutton, Dublin.^[5]

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).

^ Kirwan, Adrian James (2017). "R. L. Edgeworth and optical telegraphy in Ireland, c.1790–1805". Proceedings of the Royal Irish Academy. 117C. Dublin: 209–35.
^ O'Donnell, Ruan (2000). Aftermath: Post-Rebellion Insurgency in Wicklow, 1799–1803. ISBN 0-7165-2638-7.
^ Whitaker, Anne-Maree. "Castle Hill convict rebellion 1804". Dictionary of Sydney. Retrieved 2013-03-03.
^ Delany, Ruth (1988). A celebration of 250 years of Ireland's Inland Waterways. Belfast: Appletree Press. p. 87. ISBN 0-86281-200-3.
^ "History". Martello Tower Sutton. Archived from the original on February 10, 2010. Retrieved 2012-04-25.