See also: 1919 in Ireland, other events of 1920, 1921 in Ireland and the list of 'years in Ireland'.

Events

• February 27 - The text of the Home Rule Bill to be introduced in the House of Commons is published. It provides for the establishment of a 128-member parliament in Dublin and a 52-member parliament in Belfast.
• March 20 - The Lord Mayor of Cork, Tomás MacCurtain , is murdered when armed Royal Irish Constabulary (RIC) men broke into his house.
• March 22 - Thousands gather to pay their respects to the murdered Tomás MacCurtain. Over 8,000 Sinn Féin Volunteers line the route to St. Fionnbar's Cemetery.
• May 2 - Viscount Fitzalan is sworn in as the Lord-Lieutenant. He is the first Catholic to hold the viceroyalty since the reign of King James II.
• May 22 - In Rome, Pope Benedict XV beatifies Oliver Plunkett.
• August 19 - Following his arrest the Lord Mayor of Cork, Terence MacSwiney, goes on hunger strike in Brixton Prison.
• September 28 - There are disturbances at Mallow, County Cork when a raid on a military barracks by Liam Lynch and Ernie O'Malley is followed by a sack of the town by soldiers.
• October 25 - Terence MacSwiney, Lord Mayor of Cork, dies at Brixton Prison on the 74th day of his hunger strike.
• October 31 - Terence MacSwiney is buried in St. Finbarr's Cemetery in his native Cork City. Arthur Griffith delivers the graveside oration.
• November 1 - An 18-year-old medical student, Kevin Barry, is executed in Mountjoy Jail for the shooting dead of a soldier.
• November 12 - The hunger strike in Cork Jail is called off after the Sinn Féin President, Arthur Griffith, intervenes.
• November 21 - Bloody Sunday: The IRA, on the instructions of Michael Collins, shoot dead 14 British undercover agents in their Dublin homes. Later that day the Black and Tans open fire on a crowd at a GAA Football amtch in Croke Park killing 12 people and wounding 60.
• November 28 - The flying column of the 3rd Cork Brigade IRA, led by Tom Barry, ambushes and kills 16 auxiliary policemen at Kilmichael, County Cork.

Arts and literature

Sports

• The All-Ireland Champions are Dublin (hurling) and Tipperary (football)

Births

• April 13 - Liam Cosgrave, former Taoiseach and leader of Fine Gael.
• August 17 - Maureen O'Hara, actress.

Deaths

• October 25 - Terence MacSwiney, Lord Mayor of Cork, on the 74th day of his hunger strike.