The members of the 1st Dáil, known as Teachtaí Dála (TDs), were the Members of Parliament (MPs) returned from the 105 Irish seats 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 manifesto 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 ("absent"). The database of members of the Oireachtas (Irish parliament) includes for the 1st Dáil only those elected for Sinn Féin.
Composition of the 1st Dáil
{| class="wikitable" style="font-size: 95%;"
|-
!colspan=2|Party
!Dec. 1918
!May 1921
|-
| style="background-color: " |
|align="left"| Sinn Féin
|align="center"| 73
|align="center"| 69
|- style="text-align:center"
|
|align="center"| 22
|
|-
|
|align="center"| 6
|align="center"| 2
|-
|
|align="center"| 3
|
|-
|
|align="center"| 1
|align="center"| 1
|-
|
|
|align="center"| 23
|-
|
|
|align="center"| 4
|-
| style="background-color:" |
|align="left"|Unionist Anti-Partition League
|
|align="center"| 2
|-
|
|
|align="center"| 4
|- style="font-weight:bold; background:rgb(232,232,232);"
|colspan="2"|Total
|colspan="2" align="center"| 105
|}
Government party denoted with bullet ().
Members by constituency
{| class="wikitable sortable"
|-
! rowspan=2 | Constituency
! rowspan=2 | Name
! class="unsortable" rowspan=2 | Portrait
! colspan=4 | Party affiliation
! data-sort-type="date" rowspan=2 | Assumed office
|-
! colspan=2 | Start of Dáil term
! colspan=2 | End of Dáil term
|-
| rowspan=2 |Antrim East
| data-sort-value="McCalmont, Robert" |Robert McCalmont
| 90px
| style="background-color:" |
| Irish Unionist
| colspan=2 | <small>Resigned in 1919</small>
| Sat as MP
|-
| data-sort-value="Hanna, George" |George Hanna
| 90px
| colspan=2 | <small>Elected in 1919 by-election<br/>as Independent Unionist</small>
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Antrim Mid
| data-sort-value="Oneill, Hugh" |Hugh O'Neill
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Antrim North
| data-sort-value="Kerr-Smiley, Peter" |Peter Kerr-Smiley
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Antrim South
| data-sort-value="Craig, Charles" |Charles Craig
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Armagh Mid
| data-sort-value="Lonsdale, James Rolston" |James Lonsdale
|
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Armagh North
| data-sort-value="Allen, William" |William Allen
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Armagh South
| data-sort-value="Donnelly, Patrick" |Patrick Donnelly
|90px
| style="background-color:" |
| Irish Parliamentary
| style="background-color:" |
| Nationalist
| Sat as MP
|-
| Belfast Cromac
| data-sort-value="Lindsay, William Arthur" |William Arthur Lindsay
|
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast Duncairn
| data-sort-value="Carson, Edward" |Edward Carson
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast Falls
| data-sort-value="Devlin, Joseph" |Joseph Devlin
| 90px
| style="background-color:" |
| Irish Parliamentary
| style="background-color:" |
| Nationalist
| Sat as MP
|-
| Belfast Ormeau
| data-sort-value="Moles, Thomas" |Thomas Moles
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast Pottinger
| data-sort-value="Dixon, Herbert" |Herbert Dixon
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast St Anne's
| data-sort-value="Henry Burn, Thomas" |Thomas Henry Burn
| 90px
| style="background-color:" |
| Labour Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast Shankill
| data-sort-value="McGuffin, Samuel" |Samuel McGuffin
|
| style="background-color:" |
| Labour Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast Victoria
| data-sort-value="Donald, Thompson" |Thompson Donald
| 90px
| style="background-color:" |
| Labour Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Belfast Woodvale
| data-sort-value="Lynn, Robert" |Robert Lynn
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| County Carlow
| data-sort-value="Lennon, James" |James Lennon
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 6 August 1920
|-
| Cavan East
| data-sort-value="Griffith, Arthur" rowspan=2 |Arthur Griffith
| rowspan=2 |90px
| style="background-color:" rowspan=2 |
| colspan=3 rowspan=2 |Sinn Féin
| rowspan=2 |1 April 1919
|-
| Tyrone North West
|-
| Cavan West
| data-sort-value="Galligan, Paul" |Paul Galligan
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Clare East
| data-sort-value="Devalera, Éamon" rowspan=2 |Éamon de Valera
| rowspan=2 |90px
| style="background-color:" rowspan=2 |
| colspan=3 rowspan=2 |Sinn Féin
| rowspan=2 |1 April 1919
|-
| Mayo East
|-
| Clare West
| data-sort-value="Ohiggins, Brian" |Brian O'Higgins
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| rowspan=2 |Cork City
| data-sort-value="Deroiste, Liam" |Liam de Róiste
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| data-sort-value="Walsh, JJ" |J. J. Walsh
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Cork East
| data-sort-value="Kent, David" |David Kent
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 9 May 1919
|-
| Cork Mid
| data-sort-value="MacSwiney, Terence" |Terence MacSwiney
| 90px
| style="background-color:" |
| Sinn Féin
| colspan=2 | <small>Died in 1920</small>
| 1 April 1919
|-
| Cork North
| data-sort-value="Okeeffe, Patrick" |Patrick O'Keeffe
|
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Cork North East
| data-sort-value="Hunter, Thomas" |Thomas Hunter
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 9 May 1919
|-
| Cork South
| data-sort-value="Collins, Michael" |Michael Collins
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Cork South East
| data-sort-value="Lynch, Diarmuid" |Diarmuid Lynch
| 90px
| style="background-color:" |
| Sinn Féin
| colspan=2 | <small>Resigned in 1920</small>
| Never sat in Dáil
|-
| Cork West
| data-sort-value="Hayes, Sean" |Seán Hayes
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Donegal East
| data-sort-value="Kelly, Edward" |Edward Kelly
| 90px
| style="background-color:" |
| colspan=3 |Irish Parliamentary
| Sat as MP
|-
| Donegal North
| data-sort-value="Odoherty, Joseph" |Joseph O'Doherty
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Donegal South
| data-sort-value="Ward, Peter" |Peter Ward
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Donegal West
| data-sort-value="Sweeney, Joseph" |Joseph Sweeney
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Down East
| data-sort-value="Reid, David" |David Reid
|
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Down Mid
| data-sort-value="Craig, James" |James Craig
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Down North
| data-sort-value="Brown, Thomas Watters" |Thomas Watters Brown
|
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Down South
| data-sort-value="McVeagh, Jeremiah" |Jeremiah McVeagh
| 90px
| style="background-color:" |
| Irish Parliamentary
| style="background-color:" |
| Nationalist
| Sat as MP
|-
| Down West
| data-sort-value="Wilson, Daniel M" |Daniel M. Wilson
|
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Dublin Clontarf
| data-sort-value="Mulcahy, Richard" |Richard Mulcahy
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Dublin College Green
| data-sort-value="Okelly, Sean T" |Seán T. O'Kelly
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Dublin Harbour
| data-sort-value="Shanahan, Philip" |Philip Shanahan
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Dublin North
| data-sort-value="Lawless, Frank" |Frank Lawless
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Dublin Pembroke
| data-sort-value="FitzGerald, Desmond" |Desmond FitzGerald
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Dublin Rathmines
| data-sort-value="Dockrell, Maurice" |Maurice Dockrell
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Unionist Anti-Partition League
| Sat as MP
|-
| Dublin South
| data-sort-value="Gavan Duffy, George" |George Gavan Duffy
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Dublin St James's
| data-sort-value="McGrath, Joseph" |Joseph McGrath
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Dublin St Michan's
| data-sort-value="Staines, Michael" |Michael Staines
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Dublin St Patrick's
| data-sort-value="Markievicz, Constance" |Constance Markievicz
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Dublin St Stephen's Green
| data-sort-value="Kelly, Thomas" |Thomas Kelly
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| rowspan=3 |Dublin University
| data-sort-value="Samuels, Arthur" |Arthur Samuels
|
| style="background-color:" |
| Irish Unionist
| colspan=2 | <small>Resigned in 1919</small>
| Sat as MP
|-
| data-sort-value="Woods, Robert" |Robert Woods
| 90px
| style="background-color:" |
| colspan=3 |Independent Unionist
| Sat as MP
|-
| data-sort-value="Jellett, William" |William Jellett
|
| colspan=2 | <small>Elected in 1919 by-election<br/>as Irish Unionist</small>
| style="background-color:" |
| Unionist Anti-Partition League
| Sat as MP
|-
| Fermanagh North
| data-sort-value="Archdale, Edward" |Edward Archdale
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Fermanagh South
| data-sort-value="Omahony, Sean" |Seán O'Mahony
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Galway Connemara
| data-sort-value="Omaille, Padraic" |Pádraic Ó Máille
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Galway East
| data-sort-value="Mellows, Liam" rowspan=2|Liam Mellows
| rowspan=2 |90px
| style="background-color:" rowspan=2|
| colspan=3 rowspan=2|Sinn Féin
| rowspan=2 |21 January 1921
|-
| Meath North
|-
| Galway North
| data-sort-value="Cusack, Bryan" |Bryan Cusack
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Galway South
| data-sort-value="Fahy, Frank" |Frank Fahy
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Kerry East
| data-sort-value="Beaslai, Piaras" |Piaras Béaslaí
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Kerry North
| data-sort-value="Crowley, James" |James Crowley
|
| style="background-color:" |
| colspan=3 |Sinn Féin
| 17 June 1919
|-
| Kerry South
| data-sort-value="Lynch, Fionan" |Fionán Lynch
|
| style="background-color:" |
| colspan=3 |Sinn Féin
| 29 June 1920
|-
| Kerry West
| data-sort-value="Stack, Austin" |Austin Stack
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| Never sat in 1st Dáil
|-
| Kildare North
| data-sort-value="Ua Buachalla, Domhnall" |Domhnall Ua Buachalla
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Kildare South
| data-sort-value="Oconnor, Art" |Art O'Connor
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Kilkenny North
| data-sort-value="Cosgrave, WT" |W. T. Cosgrave
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Kilkenny South
| data-sort-value="Omara, James" |James O'Mara
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| King's County
| data-sort-value="Mccartan, Patrick" |Patrick McCartan
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| Never sat in 1st Dáil
|-
| Leitrim
| data-sort-value="Dolan, James" |James Dolan
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Limerick City
| data-sort-value="Colivet, Michael" |Michael Colivet
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Limerick East
| data-sort-value="Hayes, Richard" |Richard Hayes
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Limerick West
| data-sort-value="Collins, Con" |Con Collins
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Londonderry City
| data-sort-value="Macneill, Eoin" rowspan=2|Eoin MacNeill
| rowspan=2 |90px
| style="background-color:" rowspan=2|
| colspan=3 rowspan=2|Sinn Féin
| rowspan=2 |21 January 1919
|-
| National University
|-
| rowspan=2 |Londonderry North
| data-sort-value="Anderson, Hugh" |Hugh Anderson
|
| style="background-color:" |
| Irish Unionist
| colspan=2 | <small>Resigned in 1919</small>
| Sat as MP
|-
| data-sort-value="Barrie, Hugh T" |Hugh T. Barrie
|
| colspan=2 | <small>Elected in 1919 by-election<br/>as Irish Unionist</small>
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Londonderry South
| data-sort-value="Henry, Denis" |Denis Henry
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Longford
| data-sort-value="Mcguinness, Joseph" |Joseph McGuinness
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Louth
| data-sort-value="OKelly, John J" |John J. O'Kelly
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Mayo North
| data-sort-value="Crowley, John" |John Crowley
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Mayo South
| data-sort-value="Sears, William" |William Sears
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 19 August 1919
|-
| Mayo West
| data-sort-value="Macbride, Joseph" |Joseph MacBride
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 17 June 1919
|-
| Meath South
| data-sort-value="Duggan, Eamonn" |Eamonn Duggan
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Monaghan North
| data-sort-value="Blythe, Ernest" |Ernest Blythe
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Monaghan South
| data-sort-value="Macentee, Sean" |Seán MacEntee
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Queen's County
| data-sort-value="Ohiggins, Kevin" |Kevin O'Higgins
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Roscommon North
| data-sort-value="Plunkett, George Noble" |George Noble Plunkett
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Roscommon South
| data-sort-value="Boland, Harry" |Harry Boland
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Queen's University of Belfast
| data-sort-value="Whitla, William" |William Whitla
| 90px
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Sligo North
| data-sort-value="Clancy, JJ" |J. J. Clancy
|
| style="background-color:" |
| colspan=3 |Sinn Féin
| 29 June 1920
|-
| Sligo South
| data-sort-value="Mccabe, Alexander" |Alexander McCabe
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Tipperary East
| data-sort-value="Mccan, Pierce" |Pierce McCan
|
| style="background-color:" |
| Sinn Féin
| colspan=2 | <small>Died in 1919</small>
| Never sat in Dáil
|-
| Tipperary Mid
| data-sort-value="Burke, Seamus" |Séamus Burke
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Tipperary North
| data-sort-value="Macdonagh, Joseph" |Joseph MacDonagh
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Tipperary South
| data-sort-value="Moloney, PJ" |P. J. Moloney
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Tyrone North East
| data-sort-value="Harbison, Thomas" |Thomas Harbison
|
| style="background-color:" |
| Irish Parliamentary
| style="background-color:" |
| Nationalist
| Sat as MP
|-
| Tyrone South
| data-sort-value="Coote, William" |William Coote
|
| style="background-color:" |
| Irish Unionist
| style="background-color:" |
| Ulster Unionist
| Sat as MP
|-
| Waterford City
| data-sort-value="Redmond, William" |William Redmond
| 90px
| style="background-color:" |
| colspan=3 |Irish Parliamentary
| Sat as MP
|-
| Waterford County
| data-sort-value="Brugha, Cathal" |Cathal Brugha
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Westmeath
| data-sort-value="Ginnell, Laurence" |Laurence Ginnell
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Wexford North
| data-sort-value="Sweetman, Roger" |Roger Sweetman
| 90px
| style="background-color:" |
| Sinn Féin
| colspan=2 | <small>Resigned in 1921</small>
| 21 January 1919
|-
| Wexford South
| data-sort-value="Ryan, James" |James Ryan
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|-
| Wicklow East
| data-sort-value="Etchingham, Sean" |Seán Etchingham
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 1 April 1919
|-
| Wicklow West
| data-sort-value="Barton, Robert" |Robert Barton
| 90px
| style="background-color:" |
| colspan=3 |Sinn Féin
| 21 January 1919
|}
thumb|Photograph of members of the 1st Dáil of the Irish Republic, taken on the steps of the Mansion House in Dublin on 9 April 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. 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.
{|class="wikitable"
! Constituency
! Outgoing TD
! colspan=2|Party
! Reason for vacancy
! Date of vacancy
! Ref
|-
|Tipperary East
|Pierce McCan
|
|Death in prison
|6 March 1919
|
|-
|Cork South East
|Diarmuid Lynch
|
|Resignation
|6 August 1920
|
|}
By-elections
The following Westminster by-elections to Irish seats were filled by Unionists who sat at Westminster.
{|class="wikitable"
! Winner
! colspan=2|Party
! Constituency
! Date
! Outgoing
! colspan=2|Party
! Reason for vacancy
! Notes
|-
|Hugh T. Barrie
|
|North Londonderry
|4 March 1919
|Hugh Anderson
|
|Resignation
|The only by-election contested by Sinn Féin, Patrick McGilligan losing.
|-
|George Hanna
|
|East Antrim
|27 May 1919
|
|
|Appointed commander of the Irish Guards
|
|-
|William Jellett
|
|Dublin University
|28 July 1919
|Arthur Samuels
|
|Appointed to the High Court of Justice in Ireland
|
|}
See also
- Historic Dáil constituencies