See also: 1926 in Ireland, other events of 1927, 1928 in Ireland and the list of 'years in Ireland'.

Events

• April 6 - Dan Breen proposes a Bill in the Dáil that Article 17 of the Irish Free State Constitution be removed. President W.T. Cosgrave opposes the removal of the Oath of Allegiance.
• April 13 - Delegtaes at the annual conference of the Farmers' Party reject proposals to merge with Cumann na nGaedhael.
• April 18 - Celtic Park in Belfast is opened. It is the first greyhound track in Ireland.
• June 20 - In a radio broadcast, the leader of Fianna Fáil, Eamon de Valera, says that the results of the general election prove that the people of Ireland want to get rid of the 'Oath of Allegiance'.
• June 29 - A morning eclipse of the sun takes place across Ireland.
• July 10 - Kevin O'Higgins, Minister for Justice, is assassinated.
• July 15 - Countess Markievicz dies aged 59. She was an officer in the Irish Citizen Army, taking part in the Easter Rising. She was the first woman elected to the British House of Commons, though she did not take her seat.
• July 28 - Ireland's first automatic telephone exchange is opened in Dublin.
• August 4 - John Dillon, former nationalist MP and last leader of the Irish Parliamentary Party dies aged 76 in London.
• August 11 - Following changes to the electoral laws Fianna Fáil TDs arrive at Leinster House for the first time. They take the Oath of Allegiance as an empty formula.
• The Electricity Supply Board (ESB) is established as an offshoot of the Shannon Scheme.
• The Agricultural Credit Corporation is set up to encourage investment in agriculture.

Arts and literature

Sports

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

Births

• March 3 - Aidan Higgins, writer.

Deaths

• June 1 - J. B. Bury, historian.
• July 10 - Kevin O'Higgins, Minister for Justice, assassinated by the IRA.