1566 in Ireland

Centuries:	14th; 15th; 16th; 17th; 18th;
Decades:	1540s; 1550s; 1560s; 1570s; 1580s;
See also:	Other events of 1566 ; List of years in Ireland

Events from the year 1566 in Ireland.

Incumbent

April 25 – Shane O'Neill seeks aid for his cause from Charles IX of France.^[1]
c. June – negotiations between Archibald Campbell, 5th Earl of Argyll (chief of the Clan Campbell) and Shane O'Neill over the captivity of Sorley Boy MacDonnell.^[1]
August 2 or 3 – Shane O'Neill is proclaimed a traitor and a price is put on his head.^[1]
August – Shane O'Neill burns Armagh Cathedral in defiance of Archbishop Richard Creagh.^[1]
September 6 – an English expedition under Colonel Edward Randolph sets out from Bristol for Lough Foyle.^[1]
September 17–November 12 – Sir Henry Sidney, Lord Deputy of Ireland, campaigns against O'Neill in Armagh, Tír Eoghain and Tyrconnell, reaching Derry on October 12.^[1] Humphrey Gilbert serves under him at the start of the campaign.
October 26 – Aodh mac Maghnusa Ó Domhnaill becomes king of Tír Chonaill and The O'Donnell in succession to his half-brother Calvagh O'Donnell.^[1]
November – Shane O'Neill attacks the troops of Edward Randolph (who is killed) at Derry.^[1]

October 13 – Richard Boyle, 1st Earl of Cork, Lord High Treasurer of Ireland (died 1643)
Dominic Collins, Jesuit priest (d. 1602)
1566 or 1569 – Henry Fitzsimon, Jesuit controversialist (d. 1643 or 1645)

^ ^a ^b ^c ^d ^e ^f ^g ^h Moody, T. W.; et al., eds. (1989). A New History of Ireland. 8: A Chronology of Irish History. Oxford University Press. ISBN 978-0-19-821744-2.