A Dáil by-election was held in the constituency of Dublin County in the Irish Free State on Wednesday, 19 March 1924, to fill a vacancy in the 4th Dáil. Dublin County was an 8-seat constituency comprising the administrative county of County Dublin.
Michael Derham, TD for Cumann na nGaedheal, died on 20 November 1923. On 20 February 1924, during a debate on government motion to issue the writ of election for a vacancy in Dublin South, Thomas Johnson, leader of the Labour Party, sought to amend the motion to also issue the writ for Dublin County. This amendment was defeated by a vote of 23 to 43. A government motion to issue the writ was agreed on 22 February.
The Cumann na nGaedheal candidate, Batt O'Connor, was a member of Pembroke Urban District Council and had contested the 1923 general election in Dublin County. The Republican candidate, Seán MacEntee, had represented South Monaghan from 1918 to 1921 and Monaghan from 1921 to 1922. He did not contest the 1922 Irish general election.
Result The by-election was held on 19 March 1924. The seat was won by Batt O'Connor.
O'Connor took his seat in Dáil Éireann on 26 March, after taking the Oath of Allegiance required under Article 17 of the Constitution of the Irish Free State.
The runner-up, Seán McEntee, was elected at the June 1927 general election. The Labour candidate, Archie Heron, later served as a TD for Dublin North-West from 1937 to 1938.
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