Editing Elections in Northern Ireland (section)

==Elections to the United Kingdom House of Commons==
; Legend: U: [[Unionism in Ireland|unionist]]; N: [[Irish nationalism|nationalist]]; O: other.
{| class="wikitable"
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 | xAxisTitle=
 | yAxisTitle= Seats
 | xAxisAngle = -40
 | legend=Party
 | interpolate = no
 | showSymbols = 2
 | xType = date
 | y1Title=DUP
 | y2Title=Sinn Fein
 | y3Title=UUP
 | y4Title=SDLP
 | y5Title=APNI
 | y6Title=UKUP
 | y7Title=UPUP
 | y8Title=UUUP
 | y9Title=VUPP
 | y10Title=RLP
 | y11Title=PUP
 | y12Title=Unity
 | y13Title=NP
 | y14Title=Lab
 | y15Title=Ind U
 | y16Title=Ind N
 | y17Title=Ind Lab
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 | x=1922 ,1923 ,1924 ,1929 ,1931 ,1935 ,1945 ,1950 ,1951 ,1955 ,1959 ,1964 ,1966 ,1970 ,1974 ,1975 ,1979 ,1983 ,1987 ,1992 ,1997 ,2001 ,2005 ,2010 ,2015 ,2017 ,2019 , 
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}}|align=center|caption=Results over time(Northern Irish seats for parliament)|max-width=}}
|-
!rowspan=2|Election
! [[Sinn Féin|SF]] (N)!! [[Democratic Unionist Party|DUP]] (U) !! [[Ulster Unionist Party|UUP]] (U) !! [[Social Democratic and Labour Party|SDLP]] (N) !! [[Alliance Party of Northern Ireland|APNI]] (O) !! [[Traditional Unionist Voice|TUV]] (U) !! [[UK Unionist Party|UKUP]] (U) !! [[Ulster Popular Unionist Party|UPUP]] (U) !! [[United Ulster Unionist Party|UUUP]] (U) !! [[Vanguard Unionist Progressive Party|VUPP]] (U) !! [[Republican Labour Party|RLP]] (N) !! [[Protestant Unionist Party|PUP]] (U) !! [[Unity (Northern Ireland)|Unity]] (N) !! [[Nationalist Party (Northern Ireland)|NP]] (N) !! [[Labour Party (Ireland)|Lab]] (O) !! [[Independent Unionist|Ind U]] !! [[Independent Nationalist|Ind N]] !! [[Independent Labour|Ind Lab]] !! Total !! [[Unionism in Ireland|Total U]] !! [[Irish nationalism|Total N]] !!Total O
|-
! style="background-color: {{party color|Sinn Féin}}"| !! style="background-color: {{party color|Democratic Unionist Party}}" | !! style="background-color: {{party color|Ulster Unionist Party}}" | !! style="background-color: {{party color|Social Democratic and Labour Party}}" | !! style="background-color: {{party color|Alliance Party of Northern Ireland}}" | !! style="background-color: {{party color|Traditional Unionist Voice}}" | !! style="background-color: {{party color|UK Unionist Party}}" | !! style="background-color: {{party color|Ulster Popular Unionist Party}}" | !! style="background-color: {{party color|United Ulster Unionist Party}}" | !! style="background-color: {{party color|Vanguard Unionist Progressive Party}}" | !! style="background-color: {{party color|Republican Labour Party}}" | !! style="background-color: {{party color|Protestant Unionist Party}}" | !! style="background-color: {{party color|Unity (Northern Ireland)}}" | !! style="background-color: {{party color|Nationalist Party (Northern Ireland)}}" | !! style="background-color: {{party color|Labour Party (Ireland)}}" | !! style="background-color: {{party color|Independent Unionist}}" | !! style="background-color: {{party color|Independent Nationalist}}" | !! style="background-color: {{party color|Independent Labour}}" | !! style="background-color: black" | !! style="background-color: red" | !! style="background-color: green" | !! style="background-color: yellow" | 
|-
|[[1922 United Kingdom general election in Northern Ireland|1922]] || || ||11 || || || || || || || || || || ||2 || || || || ||13 ||11 ||2 ||
|-
|[[1923 United Kingdom general election in Northern Ireland|1923]] || || ||11 || || || || || || || || || || ||2 || || || || ||13 ||11 ||2 ||
|-
|[[1924 United Kingdom general election in Northern Ireland|1924]] || || ||13 || || || || || || || || || || || || || || || ||13 ||13 || ||
|-
|[[1929 United Kingdom general election in Northern Ireland|1929]] || || ||11 || || || || || || || || || || ||2 || || || || ||13 ||11 ||2 ||
|-
|[[1931 United Kingdom general election in Northern Ireland|1931]] || || ||11 || || || || || || || || || || ||2 || || || || ||13 ||11 ||2 ||
|-
|[[1935 United Kingdom general election in Northern Ireland|1935]] || || ||11 || || || || || || || || || || ||2 || || || || ||13 ||11 ||2 ||
|-
|[[1945 United Kingdom general election in Northern Ireland|1945]] || || ||9 || || || || || || || || || || ||2 || ||1 || ||1 ||13 ||10 ||2 ||1
|-
|[[1950 United Kingdom general election in Northern Ireland|1950]] || || ||10 || || || || || || || || || || ||2 || || || || ||12 ||10 ||2 ||
|-
|[[1951 United Kingdom general election in Northern Ireland|1951]] || || ||9 || || || || || || || || || || ||2 ||1 || || || ||12 ||9 ||2 ||1
|-
|[[1955 United Kingdom general election in Northern Ireland|1955]] ||2 || ||10 || || || || || || || || || || || || || || || ||12 ||10 ||2 ||
|-
|[[1959 United Kingdom general election in Northern Ireland|1959]] || || ||12 || || || || || || || || || || || || || || || ||12 ||12 || ||
|-
|[[1964 United Kingdom general election in Northern Ireland|1964]] || || ||12 || || || || || || || || || || || || || || || ||12 ||12 || ||
|-
|[[1966 United Kingdom general election in Northern Ireland|1966]]
|
|
|11
|
|
|
|
|
|
|
|1
|
|
|
|
|
|
|
|12
|11
|1
|
|-
|[[1970 United Kingdom general election in Northern Ireland|1970]]
|
|
|8
|
|
|
|
|
|
|
|1
|1
|2
|
|
|
|
|
|12
|9
|3
|
|-
|{{nowrap|[[February 1974 United Kingdom general election in Northern Ireland|Feb. 1974]]}}
|
|1
|7
|1
|
|
|
|
|
|3
|
|
|
|
|
|
|
|
|12
|11
|1
|
|-
|{{nowrap|[[October 1974 United Kingdom general election in Northern Ireland|Oct. 1974]]}}
|
|1
|6
|1
|
|
|
|
|
|3
|
|
|
|
|
|
|1
|
|12
|10
|2
|
|-
|[[1979 United Kingdom general election in Northern Ireland|1979]]
|
|3
|5
|1
|
|
|
|
|1
|
|
|
|
|
|
|1
|1
|
|12
|10
|2
|
|-
|[[1983 United Kingdom general election in Northern Ireland|1983]]
|1
|3
|11
|1
|
|
|
|1
|
|
|
|
|
|
|
|
|
|
|17
|15
|2
|
|-
|[[1987 United Kingdom general election in Northern Ireland|1987]]
|1
|3
|9
|3
|
|
|
|1
|
|
|
|
|
|
|
|
|
|
|17
|13
|4
|
|-
|[[1992 United Kingdom general election in Northern Ireland|1992]]
|
|3
|9
|4
|
|
|
|1
|
|
|
|
|
|
|
|
|
|
|17
|13
|4
|
|-
|[[1997 United Kingdom general election in Northern Ireland|1997]]
|2
|2
|10
|3
|
|
|1
|
|
|
|
|
|
|
|
|
|
|
|18
|13
|5
|
|-
|[[2001 United Kingdom general election in Northern Ireland|2001]]
|4
|5
|6
|3
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|18
|11
|7
|
|-
|[[2005 United Kingdom general election in Northern Ireland|2005]]
|5
|9
|1
|3
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|18
|10
|8
|
|-
|[[2010 United Kingdom general election in Northern Ireland|2010]]
|5
|8
|
|3
|1
|
|
|
|
|
|
|
|
|
|
|1
|
|
|18
|9
|8
|1
|-
|[[2015 United Kingdom general election in Northern Ireland|2015]]
|4
|8
|2
|3
|
|
|
|
|
|
|
|
|
|
|
|1
|
|
|18
|11
|7
|
|-
|[[2017 United Kingdom general election in Northern Ireland|2017]]
|7
|10
|
|
|
|
|
|
|
|
|
|
|
|
|
|1
|
|
|18
|11
|7
|
|-
|[[2019 United Kingdom general election in Northern Ireland|2019]]
|7
|8
|
|2
|1
|
|
|
|
|
|
|
|
|
|
|
|
|
|18
|8
|9
|1
|-
|[[2024 United Kingdom general election in Northern Ireland|2024]]
|7
|5
|1
|2
|1
|1
|
|
|
|
|
|
|
|
|
|1
|
|
|18
|8
|9
|1
|}
* [[Sinn Féin]] have never taken their seats in the [[United Kingdom House of Commons]] due to their policy of [[abstentionism]].
* [[Ulster Unionist Party|UUP]] MPs sat as members of the [[Conservative Party (UK)|Conservative Party]] until 1972.

{{anchor|Westminster by-elections}}

===By-elections===
Gains are marked with a grey background.
{| class="wikitable sortable"
|-
!Constituency !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Cause
|-
|[[1921 Mid Armagh by-election|Mid Armagh]]
|{{dts|format=dmy|1921-06-23}}
|[[James Lonsdale (Irish politician)|James Lonsdale]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Henry Armstrong (Northern Ireland politician)|Henry Armstrong]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|-
|[[1921 Belfast Duncairn by-election|Belfast Duncairn]]
|{{dts|format=dmy|1921-06-23}}
|[[Edward Carson]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Thomas McConnell]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointed [[Lord of Appeal in Ordinary]]
|-
|[[1921 North Down by-election|North Down]]
|{{dts|format=dmy|1921-06-23}}
|[[Thomas Watters Brown]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Thomas Watters Brown]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointed [[Solicitor-General for Ireland]]
|-
|[[1921 Mid Down by-election|Mid Down]]
|{{dts|format=dmy|1921-07-02}}
|[[James Craig, 1st Viscount Craigavon|James Craig]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Robert Sharman-Crawford]]
| {{Party name with colour|Ulster Unionist Party}}
|Elected [[Prime Minister of Northern Ireland]]
|-
|[[1921 West Down by-election|West Down]]
|{{dts|format=dmy|1921-07-05}}
|[[Daniel Martin Wilson]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Thomas Browne Wallace]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointed [[Recorder of Belfast]]
|-
|[[1921 South Londonderry by-election|South Londonderry]]
|{{dts|format=dmy|1921-08-29}}
|[[Denis Henry]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Robert Chichester (politician)|Robert Chichester]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointed [[Lord Chief Justice of Northern Ireland]]
|-
|[[1922 South Londonderry by-election|South Londonderry]]
|{{dts|format=dmy|1922-01-18}}
|[[Robert Chichester (politician)|Robert Chichester]]
| {{Party name with colour|Ulster Unionist Party}}
|[[William Pain]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|-
|[[1922 West Down by-election|West Down]]
|{{dts|format=dmy|1922-02-17}}
|[[Thomas Browne Wallace]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Hugh Hayes]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointed Chief Clerk to the [[High Court of Northern Ireland]]
|-
|[[February 1922 North Down by-election|North Down]]
|{{dts|format=dmy|1922-02-21}}
|[[Thomas Watters Brown]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Sir Henry Wilson, 1st Baronet|Sir Henry Wilson, Bt]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointed to the [[High Court of Northern Ireland]]
|-
|[[1922 North Londonderry by-election|North Londonderry]]
|{{dts|format=dmy|1922-06-04}}
|[[Hugh T. Barrie]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Malcolm Macnaghten]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|-
|[[July 1922 North Down by-election|North Down]]
|{{dts|format=dmy|1922-07-21}}
|[[Sir Henry Wilson, 1st Baronet|Sir Henry Wilson, Bt]]
| {{Party name with colour|Ulster Unionist Party}}
|[[John Simms (clergyman)|John Simms]]
| {{Party name with colour|Ulster Unionist Party}}
|Killed by the [[Irish Republican Army (1922–1969)|IRA]]
|-
|[[1929 Londonderry by-election|Londonderry]]
|{{dts|format=dmy|1929-01-29}}
|[[Malcolm Macnaghten]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Sir Ronald Ross, 2nd Baronet|Ronald Ross]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointment to [[High Court of Justice]] of England and Wales
|-
|[[1931 Fermanagh and Tyrone by-election|Fermanagh and Tyrone]]
|{{dts|format=dmy|1931-03-07}}
|[[Thomas Harbison]]
| {{Party name with colour|Nationalist Party (Northern Ireland)}}
|[[Cahir Healy]]
| {{Party name with colour|Nationalist Party (Northern Ireland)}}
|Death
|-
|[[1934 Fermanagh and Tyrone by-election|Fermanagh and Tyrone]]
|{{dts|format=dmy|1934-06-27}}
|[[Joseph Devlin]]
| {{Party name with colour|Nationalist Party (Northern Ireland)}}
|[[Joe Stewart (politician)|Joe Stewart]]
| {{Party name with colour|Nationalist Party (Northern Ireland)}}
|Death
|-
|[[1939 Down by-election|Down]]
|{{dts|format=dmy|1939-05-10}}
|[[Sir David Reid, 1st Baronet|David Reid]]
| {{Party name with colour|Ulster Unionist Party}}
|[[James Little (British politician)|James Little]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|-
|[[1940 Belfast East by-election|Belfast East]]
|{{dts|format=dmy|1940-02-08}}
|[[Herbert Dixon, 1st Baron Glentoran|Herbert Dixon]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Henry Harland (politician)|Henry Harland]]
| {{Party name with colour|Ulster Unionist Party}}
|Elevation to the Peerage
|-
|[[1940 Queen's University of Belfast by-election|Queen's University of Belfast]]
|{{dts|format=dmy|1940-11-02}}
|[[Thomas Sinclair (politician, 1857–1940)|Thomas Sinclair]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Douglas Savory]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation
|- bgcolor="#c0c0c0"
|[[1943 Belfast West by-election|Belfast West]]
|{{dts|format=dmy|1943-02-09}}
|[[Alexander Browne]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Jack Beattie]]
| {{Party name with colour|Northern Ireland Labour Party}}
|Death
|-
|[[1943 Antrim by-election|Antrim]]
|{{dts|format=dmy|1943-02-11}}
|[[Sir Joseph McConnell, 2nd Baronet|Sir Joseph McConnell, Bt]]
| {{Party name with colour|Ulster Unionist Party}}
|[[John Dermot Campbell]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|- bgcolor="#c0c0c0"
|[[1946 Down by-election|Down]]
|{{dts|format=dmy|1946-06-02}}
|[[James Little (Unionist politician)|James Little]]
| {{Party name with colour|Independent Unionist}}
|[[C. H. Mullan]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|- 
|[[1948 Armagh by-election|Armagh]]
|{{dts|format=dmy|1948-03-05}}
|[[William Allen (unionist politician)|Sir William Allen]]
| {{Party name with colour|Ulster Unionist Party}}
|[[James Harden (politician)|James Harden]]
| {{Party name with colour|Ulster Unionist Party}}
|Death by road accident
|-
|[[1950 Belfast West by-election|Belfast West]]
|{{dts|format=dmy|1950-11-29}}
|[[J. G. MacManaway]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Thomas Teevan (Unionist politician)|Thomas Teevan]]
| {{Party name with colour|Ulster Unionist Party}}
|Disqualified under the [[House of Commons (Clergy Disqualification) Act 1801]]
|- 
|[[1951 Londonderry by-election|Londonderry]]
|{{dts|format=dmy|1951-05-19}}
|[[Sir Ronald Ross, 2nd Baronet|Ronald Ross]]
| {{Party name with colour|Ulster Unionist Party}}
|[[William Wellwood]]
| {{Party name with colour|Ulster Unionist Party}}
|Appointment as Northern Ireland Government Agent in London
|-
|[[1952 North Antrim by-election|North Antrim]]
|{{dts|format=dmy|1952-10-27}}
|[[Hugh O'Neill, 1st Baron Rathcavan|Sir Hugh O'Neill]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Phelim O'Neill, 2nd Baron Rathcavan|Phelim O'Neill]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation
|-
|[[1952 Belfast South by-election|Belfast South]]
|{{dts|format=dmy|1952-11-04}}
|[[Conolly Gage]]
| {{Party name with colour|Ulster Unionist Party}}
|[[David Campbell (MP)|David Campbell]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation
|-
|[[1953 North Down by-election|North Down]]
|{{dts|format=dmy|1953-04-15}}
|[[Walter Smiles]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Patricia Ford (politician)|Patricia Ford]]
| {{Party name with colour|Ulster Unionist Party}}
|Died in [[MV Princess Victoria|MV ''Princess Victoria'' ferry disaster]]
|-
|[[1954 Armagh by-election|Armagh]]
|{{dts|format=dmy|1954-11-20}}
|[[James Harden (politician)|James Harden]]
| {{Party name with colour|Ulster Unionist Party}}
|[[C. W. Armstrong]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation
|- 
|[[1955 Mid Ulster by-election|Mid Ulster]]
|{{dts|format=dmy|1955-08-11}}
|[[Tom Mitchell (Irish politician)|Tom Mitchell]]
| {{Party name with colour|Sinn Féin}}
|[[Tom Mitchell (Irish politician)|Tom Mitchell]]
| {{Party name with colour|Sinn Féin}}
|Disqualification
|- bgcolor="#c0c0c0"
|[[1956 Mid Ulster by-election|Mid Ulster]]
|{{dts|format=dmy|1956-05-08}}
|[[Charles Beattie]]
| {{Party name with colour|Ulster Unionist Party}}
|[[George Forrest (Northern Ireland politician)|George Forrest]]
| {{Party name with colour|Independent Unionist}}
|Disqualification
|-
|[[1959 Belfast East by-election|Belfast East]]
|{{dts|format=dmy|1959-03-19}}
|[[Alan McKibbin]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Stanley McMaster]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|-
|[[1963 Belfast South by-election|Belfast South]]
|{{dts|format=dmy|1963-10-22}}
|[[David Campbell (MP)|Sir David Campbell]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Rafton Pounder]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|- bgcolor="#c0c0c0"
|[[1969 Mid Ulster by-election|Mid Ulster]]
|{{dts|format=dmy|1969-04-17}}
|[[George Forrest (Northern Ireland politician)|George Forrest]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Bernadette Devlin]]
| {{Party name with colour|Unity (Northern Ireland)}}
|Death
|- bgcolor="#c0c0c0"
|[[April 1981 Fermanagh and South Tyrone by-election|Fermanagh and South Tyrone]]
|{{dts|format=dmy|1981-04-09}}
|[[Frank Maguire (politician)|Frank Maguire]]
| {{Party name with colour|Independent Nationalist|shortname=Ind. Nationalist}}
|[[Bobby Sands]]
| {{Party name with colour|Anti H-Block}}
|Death
|-
|[[August 1981 Fermanagh and South Tyrone by-election|Fermanagh and South Tyrone]]
|{{dts|format=dmy|1981-08-20}}
|[[Bobby Sands]]
| {{Party name with colour|Anti H-Block}}
|[[Owen Carron]]
| {{Party name with colour|Anti H-Block}}
|Death from hunger strike
|-
|[[1982 Belfast South by-election|Belfast South]]
|{{dts|format=dmy|1982-03-04}}
|[[Robert Bradford (Northern Irish politician)|Robert Bradford]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Martin Smyth]]
| {{Party name with colour|Ulster Unionist Party}}
|Killed by the [[Provisional Irish Republican Army|IRA]]
|-
|[[1986 North Antrim by-election|Antrim North]]
|{{dts|format=dmy|1986-01-23}}
|[[Ian Paisley]]
| {{Party name with colour|Democratic Unionist Party}}
|[[Ian Paisley]]
| {{Party name with colour|Democratic Unionist Party}}
|Resignation in protest at [[Anglo-Irish Agreement]]
|-
|[[1986 East Antrim by-election|Antrim East]]
|{{dts|format=dmy|1986-01-23}}
|[[Roy Beggs]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Roy Beggs]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 South Antrim by-election|Antrim South]]
|{{dts|format=dmy|1986-01-23}}
|[[Clifford Forsythe]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Clifford Forsythe]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Belfast East by-election|Belfast East]]
|{{dts|format=dmy|1986-01-23}}
|[[Peter Robinson (Northern Ireland politician)|Peter Robinson]]
| {{Party name with colour|Democratic Unionist Party}}
|[[Peter Robinson (Northern Ireland politician)|Peter Robinson]]
| {{Party name with colour|Democratic Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Belfast North by-election|Belfast North]]
|{{dts|format=dmy|1986-01-23}}
|[[Cecil Walker]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Cecil Walker]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Belfast South by-election|Belfast South]]
|{{dts|format=dmy|1986-01-23}}
|[[Martin Smyth]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Martin Smyth]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 North Down by-election|Down North]]
|{{dts|format=dmy|1986-01-23}}
|[[James Kilfedder]]
| {{Party name with colour|Ulster Popular Unionist Party}}
|[[James Kilfedder]]
| {{Party name with colour|Ulster Popular Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 South Down by-election|Down South]]
|{{dts|format=dmy|1986-01-23}}
|[[Enoch Powell]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Enoch Powell]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Fermanagh and South Tyrone by-election|Fermanagh and South Tyrone]]
|{{dts|format=dmy|1986-01-23}}
|[[Ken Maginnis]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Ken Maginnis]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Lagan Valley by-election|Lagan Valley]]
|{{dts|format=dmy|1986-01-23}}
|[[James Molyneaux]]
| {{Party name with colour|Ulster Unionist Party}}
|[[James Molyneaux]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 East Londonderry by-election|East Londonderry]]
|{{dts|format=dmy|1986-01-23}}
|[[William Ross (Northern Irish politician)|William Ross]]
| {{Party name with colour|Ulster Unionist Party}}
|[[William Ross (Northern Irish politician)|William Ross]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Mid Ulster by-election|Mid Ulster]]
|{{dts|format=dmy|1986-01-23}}
|[[William McCrea, Baron McCrea of Magherafelt and Cookstown|William McCrea]]
| {{Party name with colour|Democratic Unionist Party}}
|[[William McCrea, Baron McCrea of Magherafelt and Cookstown|William McCrea]]
| {{Party name with colour|Democratic Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Strangford by-election|Strangford]]
|{{dts|format=dmy|1986-01-23}}
|[[John Taylor, Baron Kilclooney|John Taylor]]
| {{Party name with colour|Ulster Unionist Party}}
|[[John Taylor, Baron Kilclooney|John Taylor]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|- bgcolor="#c0c0c0"
|[[1986 Newry and Armagh by-election|Newry and Armagh]]
|{{dts|format=dmy|1986-01-23}}
|[[Jim Nicholson (Northern Ireland politician)|James Nicholson]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Seamus Mallon]]
| {{Party name with colour|Social Democratic and Labour Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1986 Upper Bann by-election|Upper Bann]]
|{{dts|format=dmy|1986-01-23}}
|[[Harold McCusker]]
| {{Party name with colour|Ulster Unionist Party}}
|[[Harold McCusker]]
| {{Party name with colour|Ulster Unionist Party}}
|Resignation in protest at Anglo-Irish Agreement
|-
|[[1990 Upper Bann by-election|Upper Bann]]
|{{dts|format=dmy|1990-05-17}}
|[[Harold McCusker]]
| {{Party name with colour|Ulster Unionist Party}}
|[[David Trimble]]
| {{Party name with colour|Ulster Unionist Party}}
|Death
|- bgcolor="#c0c0c0"
|[[1995 North Down by-election|North Down]]
|{{dts|format=dmy|1995-06-15}}
|[[James Kilfedder|Sir James Kilfedder]]
| {{Party name with colour|Ulster Popular Unionist Party}}
|[[Robert McCartney (Northern Irish politician)|Robert McCartney]]
| {{Party name with colour|UK Unionist Party}}
|Death
|- bgcolor="#c0c0c0"
|[[2000 South Antrim by-election|South Antrim]]
|{{dts|format=dmy|2000-09-21}}
|[[Clifford Forsythe]]
| {{Party name with colour|Ulster Unionist Party}}
|[[William McCrea, Baron McCrea of Magherafelt and Cookstown|William McCrea]]
| {{Party name with colour|Democratic Unionist Party}}
|Death
|-
|[[2011 Belfast West by-election|Belfast West]]
|{{dts|format=dmy|2011-06-09}}
|[[Gerry Adams]]
| {{Party name with colour|Sinn Féin}}
|[[Paul Maskey]]
| {{Party name with colour|Sinn Féin}}
|Resignation to contest the [[Louth (Dáil constituency)|Louth constituency]] in the [[2011 Irish general election|Irish general election]]
|-
|[[2013 Mid Ulster by-election|Mid Ulster]]
|{{dts|format=dmy|2013-03-07}}
|[[Martin McGuinness]]
| {{Party name with colour|Sinn Féin}}
|[[Francie Molloy]]
| {{Party name with colour|Sinn Féin}}
|Resignation to end dual mandate as Member of Parliament and Member of the Northern Ireland Assembly
|-
|[[2018 West Tyrone by-election|West Tyrone]]
|{{dts|format=dmy|2018-05-03}}
|[[Barry McElduff]]
| {{Party name with colour|Sinn Féin}}
|[[Órfhlaith Begley]]
| {{Party name with colour|Sinn Féin}}
|Resignation
|}

===Recall petition===
*[[2018 North Antrim recall petition]]