1775 in Ireland

Events

• Henry Flood accepts a seat on the Privy Council of Ireland and becomes vice-treasurer.
• Henry Grattan enters the Parliament of Ireland and becomes leader of the "patriot party".
• Approximate date – Dark Hedges planted.

  Arts and literature

• 17 January – Richard Brinsley Sheridan's first play, the comedy of manners The Rivals, is premiered at the Covent Garden Theatre, London.
• Robert Jephson's tragedy Braganza is first performed at the Theatre Royal, Drury Lane, London.

  Births

• 3 March – Henry Prittie, 2nd Baron Dunalley, politician.
• 25 April – William Warren Baldwin, doctor, businessman, lawyer, judge, architect and political figure in Upper Canada.
• 6 August – Daniel O'Connell, politician, campaigner for Catholic Emancipation and Repeal of the Union.
• 30 September – Robert Adrain, scientist and mathematician in America.
• ;Full date unknown
• :*Bernard McMahon, horticulturalist in the United States.
• :*William Thompson, political and philosophical writer and social reformer.

  Deaths

• 27 April – John Rutty, Quaker physician and naturalist.
• 31 December – Richard Montgomery, soldier, major general in the Continental Army during the Revolutionary War.