There have been 125 by-elections since 1923. 89 of these were caused by the death of a sitting Teachta Dála (TD). 22 TDs elected at a by-election were never subsequently re-elected at a general election.
| Winner | Party | Constituency | Date | Dáil | | Outgoing | Party | Reason for vacancy |
| Kennedy, HughHugh Kennedy[n 2] | CnaG | Dublin South | 01923-10-27 27 October 1923 | 004 4th Dáil | | Hayes, MichaelMichael Hayes | CnaG | Resignation of Michael Hayes |
| Macgilligan, Patrick Patrick McGilligan | CnaG | NUI | 01923-11-03 3 November 1923 | 004 4th Dáil | | MacNeill, EoinEoin MacNeill | CnaG | Resignation of Eoin MacNeill |
| Omara, James James O'Mara[n 2] | CnaG | Dublin South | 01924-03-12 12 March 1924 | 004 4th Dáil | | Cosgrave, PhilipPhilip Cosgrave | CnaG | Death of Philip Cosgrave |
| Oconnor, Batt Batt O'Connor | CnaG | Dublin County | 01924-03-19 19 March 1924 | 004 4th Dáil | | Derham, MichaelMichael Derham | CnaG | Death of Michael Derham |
| Oconnell, Richard Richard O'Connell | CnaG | Limerick | 01924-05-28 28 May 1924 | 004 4th Dáil | | Hayes, RichardRichard Hayes | CnaG | Resignation of Richard Hayes |
| Noonan, MichaelMichael Noonan[n 2] | CnaG | Cork East | 01924-11-18 18 November 1924 | 004 4th Dáil | | Omahony, Thomas Thomas O'Mahony | CnaG | Death of Thomas O'Mahony |
| Lemass, SeánSeán Lemass | SF | Dublin South | 01924-11-18 18 November 1924 | 004 4th Dáil | | Kennedy, HughHugh Kennedy | CnaG | Appointment of Hugh Kennedy as Chief Justice |
| Madden, JohnJohn Madden | SF | Mayo North | 01924-11-18 18 November 1924 | 004 4th Dáil | | Coyle, HenryHenry Coyle | CnaG | Disqualification of Henry Coyle |
| Egan, MichaelMichael Egan | CnaG | Cork Borough | 01924-11-19 19 November 1924 | 004 4th Dáil | | Orahilly, Alfred Alfred O'Rahilly | CnaG | Resignation of Alfred O'Rahilly |
| Maccullough, Denis Denis McCullough[n 2] | CnaG | Donegal | 01924-11-20 20 November 1924 | 004 4th Dáil | | Ward, Peter J.Peter J. Ward | CnaG | Resignation of Peter J. Ward |
| Bolger, ThomasThomas Bolger[n 2] | CnaG | Carlow–Kilkenny | 01925-03-11 11 March 1925 | 004 4th Dáil | | Gibbons, SeánSeán Gibbons | CnaG | Resignation of Seán Gibbons |
| Oreilly, John Joe John Joe O'Reilly | CnaG | Cavan | 01925-03-11 11 March 1925 | 004 4th Dáil | | Milroy, SeánSeán Milroy | CnaG | Resignation of Seán Milroy |
| Leonard, PatrickPatrick Leonard | CnaG | Dublin North | 01925-03-11 11 March 1925 | 004 4th Dáil | | Cahill, FrancisFrancis Cahill | CnaG | Resignation of Francis Cahill on 30 October 1924 |
| Traynor, OscarOscar Traynor | SF | Dublin North | 01925-03-11 11 March 1925 | 004 4th Dáil | | Macgarry, Sean Seán McGarry | CnaG | Resignation of Seán McGarry on 30 October 1924 |
| Hennessy, ThomasThomas Hennessy | CnaG | Dublin South | 01925-03-11 11 March 1925 | 004 4th Dáil | | Maccarthy, Daniel Daniel McCarthy | CnaG | Resignation of Daniel McCarthy |
| Holt, SamuelSamuel Holt | SF | Leitrim–Sligo | 01925-03-11 11 March 1925 | 004 4th Dáil | | Carter, ThomasThomas Carter | CnaG | Resignation of Thomas Carter on 30 October 1924 |
| Roddy, MartinMartin Roddy | CnaG | Leitrim–Sligo | 01925-03-11 11 March 1925 | 004 4th Dáil | | Maccabe, Alexander Alexander McCabe | CnaG | Resignation of Alexander McCabe |
| Tierney, MichaelMichael Tierney | CnaG | Mayo North | 01925-03-11 11 March 1925 | 004 4th Dáil | | Macgrath, JosephJoseph McGrath | CnaG | Resignation of Joseph McGrath on 29 October 1924 |
| Conlon, MartinMartin Conlon | CnaG | Roscommon | 01926-02-11 11 February 1926 | 004 4th Dáil | | Finlay, HenryHenry Finlay | CnaG | Resignation of Henry Finlay |
| Norton, WilliamWilliam Norton | Lab | Dublin County | 01926-02-18 18 February 1926 | 004 4th Dáil | | Figgis, DarrellDarrell Figgis | Ind | Death of Darrell Figgis |
| Dwyer, JamesJames Dwyer | CnaG | Leix–Offaly | 01926-02-18 18 February 1926 | 004 4th Dáil | | Macguinness, Sean Seán McGuinness | SF | Disqualification of Seán McGuinness |
| Osullivan, Gearoid Gearóid O'Sullivan | CnaG | Dublin County | 01927-08-24 24 August 1927 | 005 5th Dáil | | Ohiggins, Kevin Kevin O'Higgins | CnaG | Assassination of Kevin O'Higgins |
| Hennessy, ThomasThomas Hennessy | CnaG | Dublin South | 01927-08-24 24 August 1927 | 005 5th Dáil | | Markiewicz, ConstanceConstance Markiewicz | FF | Death of Constance Markiewicz |
| Gorey, DenisDenis Gorey | CnaG | Carlow–Kilkenny | 01927-11-03 3 November 1927 | 006 6th Dáil | | Cosgrave, W. T.W. T. Cosgrave | CnaG | Resignation of W. T. Cosgrave (elected for 2 constituencies) |
| Rice, VincentVincent Rice | CnaG | Dublin North | 01928-04-03 3 April 1928 | 006 6th Dáil | | Larkin, JamesJames Larkin | IWL | Disqualification of James Larkin due to bankruptcy |
| Ohiggins, Thomas F. Thomas F. O'Higgins | CnaG | Dublin North | 01929-03-14 14 March 1929 | 006 6th Dáil | | Byrne, AlfredAlfred Byrne | Ind | Election of Alfred Byrne to Seanad Éireann |
| Maceoin, Sean Seán Mac Eoin | CnaG | Leitrim–Sligo | 01929-06-07 7 June 1929 | 006 6th Dáil | | Holt, SamuelSamuel Holt | FF | Death of Samuel Holt |
| Geoghegan, JamesJames Geoghegan | FF | Longford–Westmeath | 01930-06-13 13 June 1930 | 006 6th Dáil | | Killane, JamesJames Killane | FF | Death of James Killane |
| Finlay, ThomasThomas Finlay | CnaG | Dublin County | 01930-12-09 9 December 1930 | 006 6th Dáil | | Cooper, BryanBryan Cooper | CnaG | Death of Bryan Cooper |
| Harris, ThomasThomas Harris | FF | Kildare | 01931-06-29 29 June 1931 | 006 6th Dáil | | Colohan, HughHugh Colohan | Lab | Death of Hugh Colohan |
| Rowlette, RobertRobert Rowlette[n 2] | Ind | University of Dublin | 01933-10-13 13 October 1933 | 008 8th Dáil | | Craig, JamesJames Craig | Ind | Death of James Craig |
| Lavery, CecilCecil Lavery | FG | Dublin County | 01935-06-17 17 June 1935 | 008 8th Dáil | | Oconnor, Batt Batt O'Connor | FG | Death of Batt O'Connor |
| Corbett, EamonEamon Corbett | FF | Galway | 01935-06-19 19 June 1935 | 008 8th Dáil | | Macdonough, Martin Martin McDonogh | FG | Death of Martin McDonogh |
| Neilan, MartinMartin Neilan[n 2] | FF | Galway | 01936-08-13 13 August 1936 | 008 8th Dáil | | Hogan, PatrickPatrick Hogan | FG | Death of Patrick Hogan |
| Allen, DenisDenis Allen | FF | Wexford | 01936-08-17 17 August 1936 | 008 8th Dáil | | Esmonde, OsmondOsmond Esmonde | FG | Death of Osmond Esmonde |
| Maccann, JohnJohn McCann | FF | Dublin South | 01939-06-06 6 June 1939 | 010 10th Dáil | | Beckett, JamesJames Beckett | FG | Death of James Beckett |
| Keane, John J.John J. Keane[n 2] | FF | Galway West | 01940-05-30 30 May 1940 | 010 10th Dáil | | Tubridy, SeánSeán Tubridy | FF | Death of Seán Tubridy |
| Odonoghue, Donal Donal O'Donoghue[n 2] | FF | Kerry South | 01944-11-10 10 November 1944 | 012 12th Dáil | | Lynch, FionánFionán Lynch | FG | Appointment of Fionán Lynch as a Judge |
| Shanahan, PatrickPatrick Shanahan[n 2] | FF | Clare | 01945-12-04 4 December 1945 | 012 12th Dáil | | Burke, PatrickPatrick Burke | FG | Death of Patrick Burke |
| de Valera, VivionVivion de Valera | FF | Dublin North West | 01945-12-04 4 December 1945 | 012 12th Dáil | | Okelly, Sean T. Seán T. O'Kelly | FF | Election of Seán T. O'Kelly as President |
| Crowley, HonorHonor Crowley | FF | Kerry South | 01945-12-04 4 December 1945 | 012 12th Dáil | | Crowley, FrederickFrederick Crowley | FF | Death of Frederick Crowley |
| Commons, BernardBernard Commons | CnaT | Mayo South | 01945-12-04 4 December 1945 | 012 12th Dáil | | Clery, MicheálMicheál Clery | FF | Appointment of Micheál Clery as County Registrar of Dublin |
| Corish, BrendanBrendan Corish | Lab | Wexford | 01945-12-04 4 December 1945 | 012 12th Dáil | | Corish, RichardRichard Corish | Lab | Death of Richard Corish |
| Macgrath, PatrickPatrick McGrath | FF | Cork Borough | 01946-06-14 14 June 1946 | 012 12th Dáil | | Dwyer, WilliamWilliam Dwyer | Ind | Resignation of William Dwyer |
| Macbride, Sean Seán MacBride | CnaP | Dublin County | 01947-10-29 29 October 1947 | 012 12th Dáil | | Fogarty, PatrickPatrick Fogarty | FF | Death of Patrick Fogarty |
| Kinane, PatrickPatrick Kinane | CnaP | Tipperary | 01947-10-29 29 October 1947 | 012 12th Dáil | | Odonnell, William William O'Donnell | CnaT | Death of William O'Donnell |
| Ormonde, JohnJohn Ormonde | FF | Waterford | 01947-10-29 29 October 1947 | 012 12th Dáil | | Morrissey, MichaelMichael Morrissey | FF | Death of Michael Morrissey |
| Blaney, NeilNeil Blaney | FF | Donegal East | 01948-12-07 7 December 1948 | 013 13th Dáil | | Blaney, NealNeal Blaney | FF | Death of Neal Blaney |
| Murphy, William J.William J. Murphy[n 2] | Lab | Cork West | 01949-06-15 15 June 1949 | 013 13th Dáil | | Murphy, Timothy J.Timothy J. Murphy | Lab | Death of Timothy J. Murphy |
| Odonnell, PatrickPatrick O'Donnell | FG | Donegal West | 01949-11-16 16 November 1949 | 013 13th Dáil | | Brady, BrianBrian Brady | FF | Death of Brian Brady |
| Carew, JohnJohn Carew | FG | Limerick East | 01952-06-26 26 June 1952 | 014 14th Dáil | | Bourke, DanielDaniel Bourke | FF | Death of Daniel Bourke |
| Calleary, PhelimPhelim Calleary | FF | Mayo North | 01952-06-26 26 June 1952 | 014 14th Dáil | | Ruttledge, P. J.P. J. Ruttledge | FF | Death of P. J. Ruttledge |
| Kenneally, WilliamWilliam Kenneally | FF | Waterford | 01952-06-26 26 June 1952 | 014 14th Dáil | | Redmond, BridgetBridget Redmond | FG | Death of Bridget Redmond |
| Byrne, ThomasThomas Byrne | Ind | Dublin North West | 01952-11-12 12 November 1952 | 014 14th Dáil | | Byrne, Alfred P.Alfred P. Byrne | Ind | Death of Alfred P. Byrne |
| Barry, RichardRichard Barry | FG | Cork East | 01953-06-18 18 June 1953 | 014 14th Dáil | | Keane, SeánSeán Keane | Lab | Death of Seán Keane |
| Deering, MarkMark Deering | FG | Wicklow | 01953-06-18 18 June 1953 | 014 14th Dáil | | Brennan, ThomasThomas Brennan | FF | Death of Thomas Brennan |
| Lahiffe, RobertRobert Lahiffe | FF | Galway South | 01953-08-21 21 August 1953 | 014 14th Dáil | | Fahy, FrankFrank Fahy | FF | Death of Frank Fahy |
| Barrett, StephenStephen Barrett | FG | Cork Borough | 01954-03-03 3 March 1954 | 014 14th Dáil | | Ohiggins, Thomas F. Thomas F. O'Higgins | FG | Death of Thomas F. O'Higgins |
| Coburn, GeorgeGeorge Coburn | FG | Louth | 01954-03-03 3 March 1954 | 014 14th Dáil | | Coburn, JamesJames Coburn | FG | Death of James Coburn |
| Colbert, MichaelMichael Colbert | FF | Limerick West | 01955-12-13 13 December 1955 | 015 15th Dáil | | Madden, DavidDavid Madden | FG | Death of David Madden |
| Oconnor, Kathleen Kathleen O'Connor[n 2] | CnaP | Kerry North | 01956-02-29 29 February 1956 | 015 15th Dáil | | Connor, JohnnyJohnny Connor | CnaP | Death of Johnny Connor |
| Byrne, PatrickPatrick Byrne | Ind | Dublin North East | 01956-04-30 30 April 1956 | 015 15th Dáil | | Byrne, AlfredAlfred Byrne | Ind | Death of Alfred Byrne |
| Egan, KieranKieran Egan | FF | Leix–Offaly | 01956-04-30 30 April 1956 | 015 15th Dáil | | Davin, WilliamWilliam Davin | Lab | Death of William Davin |
| Galvin, JohnJohn Galvin | FF | Cork Borough | 01956-08-02 2 August 1956 | 015 15th Dáil | | Macgrath, PatrickPatrick McGrath | FF | Death of Patrick McGrath |
| Medlar, MartinMartin Medlar | FF | Carlow–Kilkenny | 01956-11-14 14 November 1956 | 015 15th Dáil | | Walsh, ThomasThomas Walsh | FF | Death of Thomas Walsh |
| Lemass, Jnr, NoelNoel Lemass, Jnr | FF | Dublin South West | 01956-11-14 14 November 1956 | 015 15th Dáil | | Doyle, PeadarPeadar Doyle | FG | Death of Peadar Doyle |
| Sherwin, FrankFrank Sherwin | Ind | Dublin North Central | 01957-11-14 14 November 1957 | 016 16th Dáil | | Gallagher, ColmColm Gallagher | FF | Death of Colm Gallagher |
| Millar, AnthonyAnthony Millar | FF | Galway South | 01958-05-30 30 May 1958 | 016 16th Dáil | | Beegan, PatrickPatrick Beegan | FF | Death of Patrick Beegan |
| Cummins, PatrickPatrick Cummins | FF | Dublin South Central | 01958-06-25 25 June 1958 | 016 16th Dáil | | Murphy, JackJack Murphy | Ind | Resignation of Jack Murphy |
| Oceallaigh, SeanSeán Ó Ceallaigh | FF | Clare | 01959-07-22 22 July 1959 | 016 16th Dáil | | de Valera, ÉamonÉamon de Valera | FF | Election of Éamon de Valera as President |
| Ryan, RichieRichie Ryan | FG | Dublin South West | 01959-07-22 22 July 1959 | 016 16th Dáil | | Butler, BernardBernard Butler | FF | Death of Bernard Butler |
| Johnston, HenryHenry Johnston[n 2] | FF | Meath | 01959-07-22 22 July 1959 | 016 16th Dáil | | Griffin, JamesJames Griffin | FF | Death of James Griffin |
| Teehan, PatrickPatrick Teehan[n 2] | FF | Carlow–Kilkenny | 01960-06-23 23 June 1960 | 016 16th Dáil | | Hughes, JosephJoseph Hughes | FG | Death of Joseph Hughes |
| Macloughlin, Joseph Joseph McLoughlin | FG | Sligo–Leitrim | 01961-03-01 1 March 1961 | 016 16th Dáil | | Flynn, StephenStephen Flynn | FF | Death of Stephen Flynn |
| Belton, PaddyPaddy Belton | FG | Dublin North East | 01963-05-30 30 May 1963 | 017 17th Dáil | | Belton, JackJack Belton | FG | Death of Jack Belton |
| Galvin, SheilaSheila Galvin[n 2] | FF | Cork Borough | 01964-02-19 19 February 1964 | 017 17th Dáil | | Galvin, JohnJohn Galvin | FF | Death of John Galvin |
| Boylan, TerenceTerence Boylan | FF | Kildare | 01964-02-19 19 February 1964 | 017 17th Dáil | | Norton, WilliamWilliam Norton | Lab | Death of William Norton |
| Burke, JoanJoan Burke | FG | Roscommon | 01964-07-08 8 July 1964 | 017 17th Dáil | | Burke, JamesJames Burke | FG | Death of James Burke |
| Donnellan, JohnJohn Donnellan | FG | Galway East | 01964-12-03 3 December 1964 | 017 17th Dáil | | Donnellan, MichaelMichael Donnellan | CnaT | Death of Michael Donnellan |
| Desmond, EileenEileen Desmond | Lab | Cork Mid | 01965-03-10 10 March 1965 | 017 17th Dáil | | Desmond, DanDan Desmond | Lab | Death of Dan Desmond |
| Oleary, JohnJohn O'Leary | FF | Kerry South | 01966-12-07 7 December 1966 | 018 18th Dáil | | Crowley, HonorHonor Crowley | FF | Death of Honor Crowley |
| Browne, FadFad Browne | FF | Waterford | 01966-12-07 7 December 1966 | 018 18th Dáil | | Lynch, ThaddeusThaddeus Lynch | FG | Death of Thaddeus Lynch |
| French, SeánSeán French | FF | Cork Borough | 01967-11-09 9 November 1967 | 018 18th Dáil | | Casey, SeanSeán Casey | Lab | Death of Seán Casey |
| Collins, GerryGerry Collins | FF | Limerick West | 01967-11-09 9 November 1967 | 018 18th Dáil | | Collins, JamesJames Collins | FF | Death of James Collins |
| Barrett, SylvesterSylvester Barrett | FF | Clare | 01968-03-14 14 March 1968 | 018 18th Dáil | | Murphy, WilliamWilliam Murphy | FG | Death of William Murphy |
| Timmins, GodfreyGodfrey Timmins | FG | Wicklow | 01968-03-14 14 March 1968 | 018 18th Dáil | | Everett, JamesJames Everett | Lab | Death of James Everett |
| Omalley, Desmond Desmond O'Malley | FF | Limerick East | 01968-05-22 22 May 1968 | 018 18th Dáil | | Omalley, Donogh Donogh O'Malley | FF | Death of Donogh O'Malley |
| Sherwin, SeánSeán Sherwin[n 2] | FF | Dublin South West | 01970-03-04 4 March 1970 | 019 19th Dáil | | Dunne, SeánSeán Dunne | Lab | Death of Seán Dunne |
| Malone, PatrickPatrick Malone | FG | Kildare | 01970-04-14 14 April 1970 | 019 19th Dáil | | Sweetman, GerardGerard Sweetman | FG | Death of Gerard Sweetman |
| Cooney, PatrickPatrick Cooney | FG | Longford–Westmeath | 01970-04-14 14 April 1970 | 019 19th Dáil | | Lenihan, PatrickPatrick Lenihan | FF | Death of Patrick Lenihan |
| Delap, PatrickPatrick Delap[n 2] | FF | Donegal–Leitrim | 01970-12-02 2 December 1970 | 019 19th Dáil | | Odonnell, PatrickPatrick O'Donnell | FG | Death of Patrick O'Donnell |
| Macmahon, Larry Larry McMahon | FG | Dublin County South | 01970-12-02 2 December 1970 | 019 19th Dáil | | Boland, KevinKevin Boland | FF | Resignaton of Kevin Boland |
| Fitzgerald, GeneGene Fitzgerald | FF | Cork Mid | 01972-08-02 2 August 1972 | 019 19th Dáil | | Forde, PaddyPaddy Forde | FF | Death of Paddy Forde |
| Toal, BrendanBrendan Toal[n 2] | FG | Monaghan | 01973-11-27 27 November 1973 | 020 20th Dáil | | Childers, Erskine H.Erskine H. Childers | FF | Election of Erskine H. Childers as President |
| Brosnan, SeánSeán Brosnan | FF | Cork North East | 01974-11-13 13 November 1974 | 020 20th Dáil | | Ahern, LiamLiam Ahern | FF | Death of Liam Ahern |
| Kitt, Michael P.Michael P. Kitt | FF | Galway North East | 01975-03-04 4 March 1975 | 020 20th Dáil | | Kitt, Michael F.Michael F. Kitt | FF | Death of Michael F. Kitt |
| Geoghegan-Quinn, MáireMáire Geoghegan-Quinn | FF | Galway West | 01975-03-04 4 March 1975 | 020 20th Dáil | | Geoghegan, JohnnyJohnny Geoghegan | FF | Death of Johnny Geoghegan |
| Kenny, EndaEnda Kenny | FG | Mayo West | 01975-11-12 12 November 1975 | 020 20th Dáil | | Kenny, HenryHenry Kenny | FG | Death of Henry Kenny |
| Keaveney, PaddyPaddy Keaveney[n 2] | IFF | Donegal North East | 01976-06-10 10 June 1976 | 020 20th Dáil | | Cunningham, LiamLiam Cunningham | FF | Death of Liam Cunningham |
| Halligan, BrendanBrendan Halligan[n 2] | Lab | Dublin South West | 01976-06-10 10 June 1976 | 020 20th Dáil | | Lemass, Jnr, NoelNoel Lemass, Jnr | FF | Death of Noel Lemass, Jnr |
| Burke, LiamLiam Burke | FG | Cork City | 01979-11-07 7 November 1979 | 021 21st Dáil | | Kerrigan, PatrickPatrick Kerrigan | Lab | Death of Patrick Kerrigan |
| Barry, MyraMyra Barry | FG | Cork North East | 01979-11-07 7 November 1979 | 021 21st Dáil | | Brosnan, SeánSeán Brosnan | FF | Death of Seán Brosnan |
| Coughlan, ClementClement Coughlan | FF | Donegal | 01980-11-06 6 November 1980 | 021 21st Dáil | | Brennan, JosephJoseph Brennan | FF | Death of Joseph Brennan |
| Skelly, LiamLiam Skelly | FG | Dublin West | 01982-05-25 25 May 1982 | 023 23rd Dáil | | Burke, RichardRichard Burke | FG | Resignation of Burke on appointment as EU Commissioner |
| Treacy, NoelNoel Treacy | FF | Galway East | 01982-07-20 20 July 1982 | 023 23rd Dáil | | Callanan, JohnnyJohnny Callanan | FF | Death of Johnny Callanan |
| Coughlan, CathalCathal Coughlan[n 2] | FF | Donegal South West | 01983-05-13 13 May 1983 | 024 24th Dáil | | Coughlan, ClementClement Coughlan | FF | Death of Clement Coughlan |
| Leonard, TomTom Leonard | FF | Dublin Central | 01983-11-23 23 November 1983 | 024 24th Dáil | | Colley, GeorgeGeorge Colley | FF | Death of George Colley |
| Cowen, BrianBrian Cowen | FF | Laois–Offaly | 01984-06-14 14 June 1984 | 024 24th Dáil | | Cowen, BernardBernard Cowen | FF | Death of Bernard Cowen |
| Byrne, EricEric Byrne | DL | Dublin South Central | 01994-06-09 9 June 1994 | 027 27th Dáil | | Oconnell, JohnJohn O'Connell | FF | Resignation of John O'Connell |
| Ring, MichaelMichael Ring | FG | Mayo West | 01994-06-09 9 June 1994 | 027 27th Dáil | | Flynn, PádraigPádraig Flynn | FF | Resignation of Pádraig Flynn on appointment as EU Commissioner |
| Lynch, KathleenKathleen Lynch | DL | Cork North Central | 01994-11-10 10 November 1994 | 027 27th Dáil | | Osullivan, GerryGerry O'Sullivan | Lab | Death of Gerry O'Sullivan |
| Coveney, HughHugh Coveney | FG | Cork South Central | 01994-11-10 10 November 1994 | 027 27th Dáil | | Cox, PatPat Cox | PD | Resignation of Pat Cox after election as MEP |
| Fox, MildredMildred Fox | Ind | Wicklow | 01995-06-29 29 June 1995 | 027 27th Dáil | | Fox, JohnnyJohnny Fox | Ind | Death of Johnny Fox |
| Keaveney, CeciliaCecilia Keaveney | FF | Donegal North East | 01996-04-02 2 April 1996 | 027 27th Dáil | | Blaney, NeilNeil Blaney | IFF | Death of Neil Blaney |
| Lenihan, BrianBrian Lenihan, Jnr | FF | Dublin West | 01996-04-02 2 April 1996 | 027 27th Dáil | | Lenihan, BrianBrian Lenihan, Snr | FF | Death of Brian Lenihan, Snr |
| Osullivan, JanJan O'Sullivan | Lab | Limerick East | 01998-03-11 11 March 1998 | 028 28th Dáil | | Kemmy, JimJim Kemmy | Lab | Death of Jim Kemmy |
| Ryan, SeánSeán Ryan | Lab | Dublin North | 01998-03-11 11 March 1998 | 028 28th Dáil | | Burke, RayRay Burke | FF | Resignation of Ray Burke |
| Coveney, SimonSimon Coveney | FG | Cork South Central | 01998-10-23 23 October 1998 | 028 28th Dáil | | Coveney, HughHugh Coveney | FG | Death of Hugh Coveney |
| Upton, MaryMary Upton | Lab | Dublin South Central | 01999-10-27 27 October 1999 | 028 28th Dáil | | Upton, PatPat Upton | Lab | Death of Pat Upton |
| Healy, SéamusSéamus Healy | Ind | Tipperary South | 02000-06-22 22 June 2000 | 028 28th Dáil | | Ferris, MichaelMichael Ferris | Lab | Death of Michael Ferris |
| Hayes, TomTom Hayes | FG | Tipperary South | 02001-06-30 30 June 2001 | 028 28th Dáil | | Ahearn, TheresaTheresa Ahearn | FG | Death of Theresa Ahearn |
| Murphy, CatherineCatherine Murphy[n 2] | Ind | Kildare North | 02005-03-11 11 March 2005 | 029 29th Dáil | | Maccreevy, CharlieCharlie McCreevy | FF | Resignation of Charlie McCreevy on appointment as EU Commissioner |
| Macentee, ShaneShane McEntee | FG | Meath | 02005-03-11 11 March 2005 | 029 29th Dáil | | Bruton, JohnJohn Bruton | FG | Resignation of John Bruton on appointment as EU Ambassador to the United States |
| Lee, GeorgeGeorge Lee | FG | Dublin South | 02009-06-05 5 June 2009 | 030 30th Dáil | | Brennan, SéamusSéamus Brennan | FF | Death of Séamus Brennan |
| Maureen O'Sullivan | Ind | Dublin Central | 02009-06-05 5 June 2009 | 030 30th Dáil | | Gregory, TonyTony Gregory | Ind | Death of Tony Gregory |
| | N/A | Donegal South West | 02009 | 030 30th Dáil | | Gallagher, Pat Pat "the Cope" Gallagher | FF | Election of Pat "the Cope" Gallagher to the European Parliament |