1620 in Ireland

Events

• County Longford is planted by English and Scottish landowners, with much of the O'Farrell lands being confiscated and granted to new owners.
• Bangor, County Down, is granted the status of a port by King James I of England.

  Honours

• October 13 – the Blundell Baronetcy is created in the Baronetage of Ireland in favour of Francis Blundell, Vice-Treasurer and Receiver-General of Ireland.
• November 10 – the Parsons Baronetcy, of Bellamont in the County of Dublin, is created in the Baronetage of Ireland in favour of William Parsons, Surveyor General of Ireland.
• December 12 – the title of Earl of Antrim is created in the Peerage of Ireland in favour of Randal MacDonnell, Viscount Dunluce.
• The titles of Earl of Cork and Viscount of Dungarvan are created in the Peerage of Ireland in favour of Richard Boyle, Lord Boyle.
• The title of Viscount Grandison is created in the Peerage of Ireland in favour of Oliver St John, Lord Deputy of Ireland.

  Births

• Peter Talbot, Archbishop of Dublin
• Approximate date – Redmond O'Hanlon, outlaw

  Deaths

• February 15 – James Archer, Jesuit
• July 10 – John Boyle, Bishop of Cork, Cloyne and Ross