1787 in Ireland

Incumbent

• Monarch: George III

  Events

• 19 August – John Butler, 12th Baron Dunboyne, having resigned as Roman Catholic Bishop of Cork and married a cousin, Maria, contrary to his vow of celibacy, swears oaths of allegiance, abjuration and Supremacy of the monarch as Supreme Governor of the Church of England in Clonmel, the only authenticated apostate in the Catholic hierarchy in Ireland.
• 30 August – the Richardson Baronetcy, of Augher in the County of Tyrone, is created in the Baronetage of Ireland for William Richardson.
• 31 August – the Carden Baronetcy, of Templemore in the County of Tipperary, is created in the Baronetage of Ireland for John Carden, commander of the 30th Regiment of Light Dragoons, which he had helped raise.
• 3 September – the Leslie Baronetcy, of Tarbert in the County of Kerry, is created in the Baronetage of Ireland for Edward Leslie.

  Arts and literature

• The first Theatre Royal, Dublin, closes.

  Births

• 19 January – Mary Aikenhead, founder of the Sisters of Charity.
• 9 March – Robert Carew, 1st Baron Carew, politician.
• ;Full date unknown
• :*Edward Eagar, lawyer and criminal transported to Australia, politician.
• :*Reverend William Hickey, writer and philanthropist.
• :*Bishop Charles McNally, Bishop of Diocese of Clogher.
• :*James Roche Verling, British Army surgeon, became personal surgeon to Napoleon Bonaparte on St Helena.

  Deaths

• March – George Montgomery, politician.
• 12 March – Marcus Paterson, lawyer and politician.
• 4 May – Philip Skelton, clergyman and writer.
• September – Philip Phillips, Roman Catholic Archbishop of Tuam.
• December – John Proby Osborne, lawyer and politician.
• Francis Conyngham, 2nd Baron Conyngham, politician.