1721 in Ireland

Events from the year 1721 in Ireland.

Incumbent

 * Monarch: George I

Events

 * June 24 – an act of the Parliament of Great Britain permits Charles Butler, 1st Earl of Arran, to purchase the Irish estates forfeited by his brother James Butler, 2nd Duke of Ormonde.
 * The title Baron Bessborough, of Bessborough, Piltown in the County of Kilkenny, is created in the Peerage of Ireland in favour of William Ponsonby.

Births

 * Henry Jones, poet and tragedian (d. 1770)
 * Denis Maguire, Bishop (Catholic Church) (d. 1798)
 * Robert Murray, merchant (d. 1786)
 * Peter Parker, Admiral of the Fleet (d. 1811)
 * John Ruxton, landowner and politician (d. 1785)
 * Approximate date
 * Richard Houston, mezzotint engraver (d. 1775)
 * Alexander Montgomery, soldier and politician (d. 1785)

Deaths

 * July 21 (hanged) – Walter Kennedy, pirate (b. c.1695)
 * September 20 – Thomas Doggett, actor and benefactor (b. c.1670)
 * Autumn – Godfrey Boate, judge (b. 1673)
 * Denis Daly, judge (b. c.1638)
 * Sir John Kirwan, merchant (b. 1650)