The First Dáil was elected on 18 December 1918 and first met on 21 January 1919, on which date the First Ministry assumed office, and lasted for 892 days.
In 1919 Sinn Féin candidates who had been elected in the Westminster elections of 1918 refused to recognise the Parliament of the United Kingdom and instead assembled as a unicameral, revolutionary parliament called Dáil Éireann. The first meeting of Dáil Éireann occurred on 21 January 1919 in the Round Room of the Mansion House in Dublin.
- Main article: 1st Ministry of The Dáil
The term of office for the 1st Ministry was from 21 January – 1 April 1919.
- Main article: 2nd Ministry of The Dáil
The term of office for the 2nd Ministry was from 1 April 1919 – 26 August 1921.
|Government of the 1st Dáil|
|1st Ministry of The Dáil||Cathal Brugha | Eoin MacNeill | Michael Collins | Count Plunkett | Richard Mulcahy|
|2nd Ministry of The Dáil||Éamon de Valera | Michael Collins | Arthur Griffith | Count Plunkett | Cathal Brugha | Constance Markievicz | Eoin MacNeill | W. T. Cosgrave | Seán T. O'Kelly | Robert Barton | Seán Etchingham | Laurence Ginnell | Ernest Blythe|