1821 in Ireland

Centuries:	17th; 18th; 19th; 20th; 21st;
Decades:	1800s; 1810s; 1820s; 1830s; 1840s;
See also:	1821 in the United Kingdom; Other events of 1821; List of years in Ireland

Events from the year 1821 in Ireland.

Events

12 August–3 September - The newly crowned King George IV of the United Kingdom lands at Howth to become the first monarch to pay a state visit to Ireland since the 14th century. He stays at the Viceregal Lodge in Dublin; with his mistress Elizabeth Conyngham, Marchioness Conyngham, at Slane Castle; and with Viscount Powerscourt at Powerscourt House. He departs from Dunleary which is renamed Kingstown in his honour.^[1]
September–November - Potato crop fails.^[2]
28 December - Sandycove Lifeboat disaster - four lifeboatmen drown attempting to rescue Ellen of Liverpool.^[3]
Metal Man seamark erected at Rosses Point.
Loreto Abbey established by Sisters of Loreto at Rathfarnham.

18 January - The Albany New Theatre opens in Dublin. In August, King George IV attends a performance, following which it becomes Dublin's second Theatre Royal.^[2]
John Banim's poem The Celt's Paradise is published, and his play Damon and Pythias is first performed (at the Theatre Royal, Covent Garden) on 28 May.

20 January - Dennis Mahony, co-founder of the Herald newspaper in Dubuque, Iowa (died 1879 in the United States).
February (possible date) - Robert O'Hara Burke, explorer of Australia (died 1861 in Australia).
17 February - Lola Montez, born Eliza Rosanna Gilbert, "Spanish dancer" and royal mistress (died 1861 in the United States).
20 February - Miles Gerard Keon, journalist, novelist, colonial secretary and lecturer (died 1875).
21 February - "Roaring" Hugh Hanna, Evangelical preacher (died 1892).
8 March - James Sheridan Muspratt, research chemist and teacher (died 1871).
28 March - William Howard Russell, journalist (died 1907).
20 July - Michael Hannan, Archbishop in Roman Catholic Archdiocese of Halifax, Nova Scotia (died 1882 in Canada).
22 September - John Conness, United States Senator from California, 1863–1869 (died 1909 in the United States).
18 December - William Magee, Anglican clergyman, Archbishop of York (died 1891).
21 December - Samuel Haughton, scientific writer (died 1897).
27 December - Jane Francesca Elgee, later Lady Wilde, poet ("Esperanza"; died 1896).
Date unknown - Joseph Robinson Kirk - sculptor (died 1894).