This is a list of events from the year 1805 in Ireland

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← 1804 1803 1802 1801 1800 1805 in Ireland → 1806 1807 1808 1809 1810
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See also:	1805 in the United Kingdom Other events of 1805 List of years in Ireland

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• August – rebel leader Michael Dwyer, held without sentence in Kilmainham Gaol, is transported to Sydney (Australia), where he lands as a free settler in February 1806.
• 21 October – Battle of Trafalgar: a British Royal Navy fleet led by Admiral Horatio Nelson defeats a combined French and Spanish fleet off the coast of Spain. Almost 4,000 of the 18,000 men on the British ships were born in Ireland.^[1]

• Mary Tighe's poem Psyche, or the Legend of Love

• 2 January – John Hogan, businessman and United States Representative from Missouri (died 1892).
• 5 April – Samuel Forde, painter from Cork (died 1828).
• 4 August – William Rowan Hamilton, mathematician, physicist, and astronomer (died 1865).

  Full date unknown

  • Jon Riley, deserter from United States Army, a founder of the San Patricios (died 1850).
  • Anthony Coningham Sterling, British Army officer and historian (died 1871).
  • William Thompson, naturalist (died 1852).

• 27 April – William Trench, 1st Earl of Clancarty, politician and statesman (born 1741).
• 7 May – William Petty, 2nd Earl of Shelburne, British Whig statesman, Home Secretary in 1782 and Prime Minister 1782–1783 (born 1737).
• 18 June – Arthur Murphy, editor and writer (born 1727).
• 27 July – Brian Merriman, Irish language poet and teacher (b. c. 1749).
• August – John Talbot Dillon, traveller and historical writer (b. c. 1740).
• 8 December – Rose ffrench, 1st Baroness ffrench.

• 1805 in Scotland
• 1805 in Wales