# Members of the 1st Dáil

The members of the First Dáil, known as Teachtaí Dála (TDs), were the 101 Members of Parliament (MPs) returned from constituencies in Ireland at the 1918 United Kingdom general election. In its first general election, Sinn Féin won 73 seats and viewed the result as a mandate for independence; in accordance with its declared policy of abstentionism, its 69 MPs refused to attend the British House of Commons in Westminster, and established a revolutionary parliament known as Dáil Éireann. The other Irish MPs — 26 unionists and six from the Irish Parliamentary Party (IPP) — sat at Westminster and for the most part ignored the invitation to attend the Dáil. Thomas Harbison, IPP MP for North East Tyrone, did acknowledge the invitation, but "stated he should decline for obvious reasons". The Dáil met for the first time on 21 January 1919 in Mansion House in Dublin. Only 27 members attended; most of the other Sinn Féin TDs were imprisoned by the British authorities, or in hiding under threat of arrest. All 101 MPs were considered TDs, and their names were called out on the roll of membership, though there was some laughter when Irish Unionist Alliance leader Edward Carson was described as as láthair ("absent"). The database of members of the Oireachtas (Irish parliament) includes for the First Dáil only those elected for Sinn Féin.

## Composition of the 1st Dáil

| Party | Party | Dec. 1918 | May 1921 |
| ● | Sinn Féin | 73 | 69 |
| | Irish Unionist | 22 | — |
| | Irish Parliamentary | 6 | 2 |
| | Labour Unionist | 3 | — |
| | Ind. Unionist | 1 | 1 |
| | UUP | — | 23 |
| | Nationalist | — | 4 |
| | Unionist Anti-Partition League | — | 2 |
| | Vacant | — | 4 |
| Total | Total | 105 | 105 |
Government party denoted with bullet (●).

## Members by constituency

| Constituency | Name | Portrait | Party affiliation | Party affiliation | Party affiliation | Party affiliation | Assumed office |
| Constituency | Name | Portrait | Start of Dáil term | Start of Dáil term | End of Dáil term | End of Dáil term | | Assumed office |
| Antrim East | Robert McCalmont | | | Irish Unionist | Resigned in 1919 | Resigned in 1919 | Abstained |
| Antrim East | George Hanna | | Elected in 1919 by-election as Independent Unionist | Elected in 1919 by-election as Independent Unionist | | Ulster Unionist | Abstained |
| Antrim Mid | Hugh O'Neill | | | Irish Unionist | | Ulster Unionist | Abstained |
| Antrim North | Peter Kerr-Smiley | | | Irish Unionist | | Ulster Unionist | Abstained |
| Antrim South | Charles Curtis Craig | | | Irish Unionist | | Ulster Unionist | Abstained |
| Armagh Mid | James Rolston Lonsdale | | | Irish Unionist | | Ulster Unionist | Abstained |
| Armagh North | William Allen | | | Irish Unionist | | Ulster Unionist | Abstained |
| Armagh South | Patrick Donnelly | | | Irish Parliamentary | | Nationalist | Abstained |
| Belfast Cromac | William Arthur Lindsay | | | Irish Unionist | | Ulster Unionist | Abstained |
| Belfast Duncairn | Edward Carson | | | Irish Unionist | | Ulster Unionist | Abstained |
| Belfast Falls | Joseph Devlin | | | Irish Parliamentary | | Nationalist | Abstained |
| Belfast Ormeau | Thomas Moles | | | Irish Unionist | | Ulster Unionist | Abstained |
| Belfast Pottinger | Herbert Dixon | | | Irish Unionist | | Ulster Unionist | Abstained |
| Belfast St Anne's | Thomas Henry Burn | | | Labour Unionist | | Ulster Unionist | Abstained |
| Belfast Shankill | Samuel McGuffin | | | Labour Unionist | | Ulster Unionist | Abstained |
| Belfast Victoria | Thompson Donald | | | Labour Unionist | | Ulster Unionist | Abstained |
| Belfast Woodvale | Robert Lynn | | | Irish Unionist | | Ulster Unionist | Abstained |
| County Carlow | James Lennon | | | Sinn Féin | Sinn Féin | Sinn Féin | 6 August 1920 |
| Cavan East | Arthur Griffith | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Tyrone North West | Arthur Griffith | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Cavan West | Paul Galligan | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Clare East | Éamon de Valera | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Mayo East | Éamon de Valera | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Clare West | Brian O'Higgins | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Cork City | Liam de Róiste | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Cork City | J. J. Walsh | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Cork East | David Kent | | | Sinn Féin | Sinn Féin | Sinn Féin | 9 May 1919 |
| Cork Mid | Terence MacSwiney | | | Sinn Féin | Died in 1920 | Died in 1920 | 1 April 1919 |
| Cork North | Patrick O'Keeffe | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Cork North East | Thomas Hunter | | | Sinn Féin | Sinn Féin | Sinn Féin | 9 May 1919 |
| Cork South | Michael Collins | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Cork South East | Diarmuid Lynch | | | Sinn Féin | Resigned in 1920 | Resigned in 1920 | Never sat in Dáil |
| Cork West | Seán Hayes | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Donegal East | Edward Kelly | | | Irish Parliamentary | Irish Parliamentary | Irish Parliamentary | Abstained |
| Donegal North | Joseph O'Doherty | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Donegal South | Peter Ward | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Donegal West | Joseph Sweeney | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Down East | David Reid | | | Irish Unionist | | Ulster Unionist | Abstained |
| Down Mid | James Craig | | | Irish Unionist | | Ulster Unionist | Abstained |
| Down North | Thomas Watters Brown | | | Irish Unionist | | Ulster Unionist | Abstained |
| Down South | Jeremiah McVeagh | | | Irish Parliamentary | | Nationalist | Abstained |
| Down West | Daniel M. Wilson | | | Irish Unionist | | Ulster Unionist | Abstained |
| Dublin Clontarf | Richard Mulcahy | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Dublin College Green | Seán T. O'Kelly | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Dublin Harbour | Philip Shanahan | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Dublin North | Frank Lawless | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Dublin Pembroke | Desmond FitzGerald | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Dublin Rathmines | Maurice Dockrell | | | Irish Unionist | | Unionist Anti-Partition League | Abstained |
| Dublin South | George Gavan Duffy | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Dublin St James's | Joseph McGrath | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Dublin St Michan's | Michael Staines | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Dublin St Patrick's | Constance Markievicz | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Dublin St Stephen's Green | Thomas Kelly | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Dublin University | Arthur Samuels | | | Irish Unionist | Resigned in 1919 | Resigned in 1919 | Abstained |
| Dublin University | Robert Woods | | | Independent Unionist | Independent Unionist | Independent Unionist | Abstained |
| Dublin University | William Jellett | | Elected in 1919 by-election as Irish Unionist | Elected in 1919 by-election as Irish Unionist | | Unionist Anti-Partition League | Abstained |
| Fermanagh North | Edward Archdale | | | Irish Unionist | | Ulster Unionist | Abstained |
| Fermanagh South | Seán O'Mahony | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Galway Connemara | Pádraic Ó Máille | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Galway East | Liam Mellows | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1921 |
| Meath North | Liam Mellows | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1921 |
| Galway North | Bryan Cusack | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Galway South | Frank Fahy | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Kerry East | Piaras Béaslaí | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Kerry North | James Crowley | | | Sinn Féin | Sinn Féin | Sinn Féin | 17 June 1919 |
| Kerry South | Fionán Lynch | | | Sinn Féin | Sinn Féin | Sinn Féin | 29 June 1920 |
| Kerry West | Austin Stack | | | Sinn Féin | Sinn Féin | Sinn Féin | Never sat in 1st Dáil |
| Kildare North | Domhnall Ua Buachalla | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Kildare South | Art O'Connor | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Kilkenny North | W. T. Cosgrave | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Kilkenny South | James O'Mara | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| King's County | Patrick McCartan | | | Sinn Féin | Sinn Féin | Sinn Féin | Never sat in 1st Dáil |
| Leitrim | James Dolan | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Limerick City | Michael Colivet | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Limerick East | Richard Hayes | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Limerick West | Con Collins | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Londonderry City | Eoin MacNeill | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| National University | Eoin MacNeill | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Londonderry North | Hugh Anderson | | | Irish Unionist | Resigned in 1919 | Resigned in 1919 | Abstained |
| Londonderry North | Hugh T. Barrie | | Elected in 1919 by-election as Irish Unionist | Elected in 1919 by-election as Irish Unionist | | Ulster Unionist | Abstained |
| Londonderry South | Denis Henry | | | Irish Unionist | | Ulster Unionist | Abstained |
| Longford | Joseph McGuinness | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Louth | John J. O'Kelly | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Mayo North | John Crowley | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Mayo South | William Sears | | | Sinn Féin | Sinn Féin | Sinn Féin | 19 August 1919 |
| Mayo West | Joseph MacBride | | | Sinn Féin | Sinn Féin | Sinn Féin | 17 June 1919 |
| Meath South | Eamonn Duggan | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Monaghan North | Ernest Blythe | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Monaghan South | Seán MacEntee | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Queen's County | Kevin O'Higgins | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Roscommon North | George Noble Plunkett | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Roscommon South | Harry Boland | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Queen's University of Belfast | William Whitla | | | Irish Unionist | | Ulster Unionist | Abstained |
| Sligo North | J. J. Clancy | | | Sinn Féin | Sinn Féin | Sinn Féin | 29 June 1920 |
| Sligo South | Alexander McCabe | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Tipperary East | Pierce McCan | | | Sinn Féin | Died in 1919 | Died in 1919 | Never sat in Dáil |
| Tipperary Mid | Séamus Burke | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Tipperary North | Joseph MacDonagh | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Tipperary South | P. J. Moloney | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Tyrone North East | Thomas Harbison | | | Irish Parliamentary | | Nationalist | Abstained |
| Tyrone South | William Coote | | | Irish Unionist | | Ulster Unionist | Abstained |
| Waterford City | William Redmond | | | Irish Parliamentary | Irish Parliamentary | Irish Parliamentary | Abstained |
| Waterford County | Cathal Brugha | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Westmeath | Laurence Ginnell | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Wexford North | Roger Sweetman | | | Sinn Féin | Resigned in 1921 | Resigned in 1921 | 21 January 1919 |
| Wexford South | James Ryan | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |
| Wicklow East | Seán Etchingham | | | Sinn Féin | Sinn Féin | Sinn Féin | 1 April 1919 |
| Wicklow West | Robert Barton | | | Sinn Féin | Sinn Féin | Sinn Féin | 21 January 1919 |

## Changes
### Vacancies

When the Sinn Féin executive met on 1 January 1919 to plan for the Dáil's inaugural meeting, it considered appointing substitutes for the imprisoned Sinn Féin TDs who would be unable to attend, but decided against this. When Pierce McCan died on 6 March 1919, his East Tipperary seat was left vacant at Westminster. In April 1919 a Dáil committee considering how to fill the vacancy considered allowing nomination by the Labour Party (which had stood aside in the 1918 election to avoid splitting the nationalist vote) before recommending that the Sinn Féin constituency organisation should nominate. However, in June 1919 the Dáil decided that "it was due to the memory of the late Pierce McCann that his place should not be filled at present". Later vacancies were also left unfilled; when Diarmuid Lynch resigned his seat in 1920, Arthur Griffith said "as the letter of resignation was addressed to the people of South-East Cork, the next step in the matter lay with the South-East Cork Executive of Sinn Fein".
Four TDs represented two separate constituencies: Éamon de Valera, Arthur Griffith, Eoin MacNeill and Liam Mellowes. Ordinarily, this would prompt them to choose one constituency to represent, and to move a writ for a by-election in the other constituency.
| Constituency | Outgoing TD | Party | Reason for vacancy | Date of vacancy |
| Tipperary East | Pierce McCan | Sinn Féin | Death in prison | 6 March 1919 |
| Cork South East | Diarmuid Lynch | Sinn Féin | Resignation | 6 August 1920 |
| Cork Mid | Terence MacSwiney | Sinn Féin | Death from hunger strike | 25 October 1920 |
| North Wexford | Roger Sweetman | Sinn Féin | Resignation | 27 January 1921 |

### By-elections

The following Westminster by-elections to Irish seats were filled by Unionists who sat at Westminster.
| Winner | Party | Constituency | Date | Outgoing | Party | Reason for vacancy | Notes |
| Hugh T. Barrie | Irish Unionist | North Londonderry | 4 March 1919 | Hugh Anderson | Irish Unionist | Resignation | The only by-election contested by Sinn Féin, Patrick McGilligan losing. |
| George Hanna | Ind. Unionist | East Antrim | 27 May 1919 | Robert McCalmont | Irish Unionist | Appointed commander of the Irish Guards | |
| William Jellett | Irish Unionist | Dublin University | 28 July 1919 | Arthur Samuels | Irish Unionist | Appointed to the High Court of Justice in Ireland | |