Events from the year 1774 in Ireland.

• Monarch: George III

• 17 September – Clifton House, Belfast, the Belfast Charitable Society's poorhouse, is opened.
• New buildings in Armagh provided by Archbishop Richard Robinson are completed for the County Infirmary, Royal School and Military Barracks.^[1]

• 7 May – Francis Beaufort, hydrographer and officer in the British Royal Navy, creator of the Beaufort scale (died 1857).
• 11 July – Somerset Lowry-Corry, 2nd Earl Belmore, politician and statesman (died 1841).
• 29 December – Maurice FitzGerald, 18th Knight of Kerry, Whig politician (died 1849).

  Full date unknown

  • Máire Bhuí Ní Laoghaire, poet (d.c1849).
  • Bartholomew Teeling, a leader of the Irish forces during the Irish Rebellion of 1798 (died 1798).

• 4 April – Oliver Goldsmith, novelist and playwright (born 1728 or 1730).
• 11 July – Sir William Johnson, 1st Baronet, pioneer and army officer in colonial New York (born 1715).
• 14 July – Field Marshal James O'Hara, 2nd Baron Tyrawley, officer in the British Army (born 1682).
• 27 December – Henry Mossop, actor (born 1729).
• Sir Robert Blackwood, 1st Baronet (born 1694).