1806 in Ireland

Events

• 10 April – Sir Arthur Wellesley marries Kitty Pakenham, daughter of the Earl of Longford, in the temporary St. George's Church built on Whitworth Road in Dublin.
• American engraver Henry Pelham, agent for Lord Lansdowne's Irish estates, is drowned from a boat while superintending the erection of a martello tower in the Kenmare River.

  Arts and literature

• John Wilson Croker publishes his mock-heroic verse satire on Dublin socio-political life The Amazoniad; or, Figure and Fashion.
• Sydney Owenson publishes her epistolary novel The Wild Irish Girl: a National Tale.
• Samuel Thomson publishes his third volume of verse Simple Poems on a Few Subjects.
• The English architect George Papworth moves to Dublin.

  Births

• 21 January – William Quarter, first Roman Catholic bishop of Chicago.
• 25 January – Daniel Maclise, painter.
• 10 May - James Shields, Irish American politician and United States Army officer
• 31 May – Patrick Leahy, Archbishop of Cashel.
• 25 July – John O'Donovan, scholar and first historic topographer.
• 1 August – Edward Crofton, 2nd Baron Crofton, Conservative politician.
• 17 August – Peter Richard Kenrick, first Catholic archbishop west of the Mississippi River.
• 20 August – Archibald Acheson, 3rd Earl of Gosford, Member of Parliament for Armagh.
• 31 August – Charles Lever, novelist.
• September – Samuel Davidson, biblical scholar.
• 15 October – William Clements, 3rd Earl of Leitrim, nobleman and landowner.
• 3 November – Robert Molesworth, judge in Australia.
• 4 December – John T. Graves, mathematician.
• ;Full date unknown
• :*Simon Byrne, prize-fighter.

  Deaths

• 22 February – James Barry, painter.
• 31 May – George Macartney, 1st Earl Macartney, statesman, colonial administrator and diplomat.
• 11 July – James Smith, lawyer and politician in the United States, signatory of the U.S. Declaration of Independence.
• 9 September – William Paterson, judge in the United States, signatory of the U.S. Constitution.
• 18 September – Patrick Cotter O'Brien, known as the Bristol Giant and the Irish Giant.
• 30 September – William Fortescue, 1st Earl of Clermont, politician.