February – Roman Catholic nobility and gentry offer support to King George III in the Seven Years' War in the Iberian Peninsula.
20 March – a French privateer takes six ships off Youghal.
30 April – acts grant security to Protestants who have acquired property from Catholics.
Old St. Thomas's Church, Dublin, in Marlborough Street, is completed.
Watt distillery in Derry is established; it will produce Tyrconnell (whiskey).
Arts and literature
14 May – Charles Macklin's The True-Born Irishman is first performed at the Crow Street Theatre in Dublin.
Approximate date – James Barry paints Baptism of the King of Cashel.
Births
11 January – Andrew Cherry, playwright, songwriter, actor and theatrical manager (died 1812 in Wales).
24 February – Gideon Ouseley, Methodism's 'apostle to the Irish' (died 1839).
20 May – Eyre Coote, British Army officer (died 1832).
1 June – Edmund Ignatius Rice, Roman Catholic missionary and educationalist, founder of the Congregation of Christian Brothers and the Presentation Brothers (died 1844).
12 June – Chambré Brabazon Ponsonby-Barker, politician (died 1834).
25 December – Michael Kelly, actor, singer and composer (died 1826).
Henry Browne Hayes, sheriff and abductor (died 1832).
Approximate date – John Chetwode Eustace, Roman Catholic priest and antiquary (died 1815 in Italy).
Deaths
20 February – Chambré Brabazon Ponsonby, politician (born c.1720).
20 March – James Cuffe, landowner (born 1707).
22 March – Courthorpe Clayton, soldier and courtier.
September
Francesco Geminiani, violinist and composer (born 1687 in Italy).
Seán Ó Murchadha, poet.
16 November – John Boyle, 5th Earl of Cork, writer (born 1707).
30 December – Robert Blakeney, politician (born c.1724).
Macnamara Morgan, playwright and barrister (born c.1720).
Charles Smith, topographer and apothecary (born 1715).