List of Northern Ireland Parliament by-elections

This is a list of by-elections to the Northern Ireland House of Commons, from its creation in 1921 until its abolition in 1972.

Date	Constituency	Incumbent			Winner			Cause
2 May 1923	Belfast West	William Twaddell		UUP	Philip James Woods		Ind. Unionist	Death
6 November 1925	Belfast South	Philip James Woods		UUP	Anthony Babington		UUP	Declined seat in favour of Belfast West
25 November 1925	Armagh	Richard Best		UUP	John Clarke Davison		UUP	Appointed Lord Justice of Appeal
10 November 1930	North Tyrone	William Thomas Miller		UUP	James Fulton Gamble		UUP	Death
4 June 1934	Belfast Central	Joseph Devlin		Nationalist	Thomas Joseph Campbell		Nationalist	Death
22 March 1935	Queen's University of Belfast	Robert McNeill		Ind. Unionist	Arthur Brownlow Mitchell		UUP	Resignation
2 April 1937	Belfast Ballynafeigh	Thomas Moles		UUP	Frederick Thompson		UUP	Death
7 May 1937	Foyle	James Joseph McCarroll		Nationalist	Patrick Maxwell		Nationalist	Death
27 May 1937	Larne	George Boyle Hanna		UUP	Harold Claude Robinson		UUP	Resignation
29 September 1938	Mid Armagh	John Clarke Davison		UUP	Norman Stronge		UUP	Resignation
5 December 1938	Queen's University of Belfast	Robert James Johnstone		UUP	Howard Stevenson		UUP	Death
27 April 1939	City of Londonderry	Edward Sullivan Murphy		UUP	William Lowry		UUP	Death
10 November 1939	Bannside	George Charles Gillespie Young		UUP	Malcolm Patrick		UUP	Death
15 March 1941	Central Armagh	David Shillington		UUP	George Dougan		UUP	Death
27 March 1941	North Down	James Craig		UUP	Thomas Bailie		Ind. Unionist	Death
2 July 1941	Mid Tyrone	Hugh McAleer		Nationalist	Michael McGurk		Ind. Nationalist	Death
3 December 1941	Belfast Willowfield	Arthur Black		UUP	Harry Midgley		NI Labour	Resignation
2 April 1942	Belfast Falls	Richard Byrne		Nationalist	Eamon Donnelly		Ind. Republican	Death
19 October 1942	Queen's University of Belfast	Arthur Brownlow Mitchell		UUP	William Lyle		UUP	Death
2 July 1943	Queen's University of Belfast	Robert Corkey		UUP	John W. Renshaw		UUP	Resignation
11 August 1943	North Tyrone	James Gamble		UUP	Thomas Lyons		UUP	Death
26 August 1943	Carrick	John Fawcett Gordon		UUP	John Dermot Campbell		UUP	Resignation
13 December 1944	Queen's University of Belfast	John MacDermott		UUP	Herbert Quin		UUP	Appointed High Court Judge
12 April 1945	South Tyrone	Rowley Elliott		UUP	W. F. McCoy		UUP	Death
19 April 1945	Carrick	John Dermot Campbell		UUP	Lancelot Curran		UUP	Death
19 April 1945	Larne	Harold Claude Robinson		UUP	Walter Topping		UUP	Death
15 October 1945	North Antrim	Robert Lynn		UUP	William McCleery		UUP	Death
22 August 1946	Belfast Central	Thomas Joseph Campbell		Nationalist	Frank Hanna		NI Labour	Resignation
7 November 1946	Bannside	Malcolm Patrick		UUP	Terence O'Neill		UUP	Death
27 June 1947	City of Londonderry	William Lowry		UUP	James Godfrey MacManaway		UUP	Resignation
20 April 1948	Queen's University, Belfast	Frederick McSorley		Independent	Samuel Irwin		UUP	Death
16 August 1948	Mid Tyrone	Michael McGurk		Nationalist	Edward McCullagh		Nationalist	Death
24 October 1949	Enniskillen	Erne Ferguson		UUP	Thomas Charles Nelson		UUP	Resignation
15 November 1949	Queen's University, Belfast	William Lyle		UUP	Frederick Lloyd-Dodd		UUP	Death
29 November 1949	Belfast Duncairn	William Grant		UUP	George Boyle Hanna		UUP	Death
20 January 1950	Carrick	Lancelot Curran		UUP	Alexander Hunter		UUP	Resignation
4 April 1950	Belfast Woodvale	John William Nixon		Ind. Unionist	Robert Harcourt		UUP	Death
31 October 1950	Belfast Bloomfield	Herbert Dixon		UUP	Daniel Dixon		UUP	Death
6 December 1950	South Armagh	Malachy Conlon		Nationalist	Charles McGleenan		Anti-Partition	Death
2 February 1951	Antrim Borough	Hugh Minford		UUP	Nat Minford		UUP	Death
18 June 1951	City of Londonderry	James Godfrey MacManaway		UUP	Edward Warburton Jones		UUP	Resignation
10 December 1951	South Antrim	John Milne Barbour		UUP	Brian McConnell		UUP	Death
8 May 1954	Enniskillen	Thomas Charles Nelson		UUP	Harry West		UUP	Death
15 October 1955	Central Armagh	George Dougan		UUP	Isaac Hawthorne		UUP	Death
15 November 1955	Belfast Woodvale	Robert Harcourt		UUP	Neville Martin		UUP	Elected Lord Mayor of Belfast
23 November 1956	Belfast Windsor	Archibald Wilson		UUP	Herbert Kirk		UUP	Resignation
4 December 1956	Belfast Duncairn	George Boyle Hanna		UUP	William Fitzsimmons		UUP	Resignation
5 March 1959	West Down	John Edgar Bailey		UUP	David John Little		UUP	Death
28 May 1959	Belfast Clifton	Robin Kinahan		UUP	William James Morgan		UUP	Elected Lord Mayor of Belfast
5 February 1960	Larne	Walter Topping		UUP	William Craig		UUP	Resignation
16 February 1960	Belfast Shankill	Henry Holmes		UUP	Desmond Boal		UUP	Resignation
9 July 1960	South Londonderry	Dehra Parker		UUP	James Chichester-Clark		UUP	Resignation
29 November 1960	North Londonderry	Robert Moore		UUP	Joseph Burns		UUP	Death
20 April 1961	Belfast Bloomfield	Daniel Dixon		UUP	Walter Scott		UUP	Resignation
22 November 1961	Queen's University, Belfast	Samuel Irwin		UUP	Sheelagh Murnaghan		Ulster Liberal	Death
6 December 1962	Belfast Cromac	Joseph Morgan		UUP	William Kennedy		UUP	Death
9 May 1964	Iveagh	Brian Maginess		UUP	Samuel Magowan		UUP	Appointed County Court Judge
30 June 1964	East Tyrone	Joseph Francis Stewart		Nationalist	Austin Currie		Nationalist	Death
3 December 1964	Mid Down	John L. O. Andrews		UUP	Basil Kelly		UUP	Elected to Senate
19 June 1965	West Down	David John Little		UUP	John Dobson		UUP	Appointed Recorder of Londonderry
23 November 1966	Queen's University, Belfast	Charles Stewart		Independent	Robert Porter		UUP	Resignation
25 May 1967	South Down	Joseph Connellan		Nationalist	Michael Keogh		Nationalist	Death
22 March 1968	Lisnaskea	Basil Brooke		UUP	John Brooke		UUP	Resignation
16 May 1968	City of Londonderry	Edward Warburton Jones		UUP	Albert Anderson		UUP	Appointed High Court Judge
6 November 1968	South Antrim	Brian McConnell		UUP	Richard Ferguson		UUP	Resignation
16 April 1970	Bannside	Terence O'Neill		UUP	Ian Paisley		Protestant Unionist	Resignation
16 April 1970	South Antrim	Richard Ferguson		UUP	William Beattie		Protestant Unionist	Resignation
12 November 1970	Belfast St Anne's	Norman Laird		UUP	John Laird		UUP	Death