List of United Kingdom by-elections (1918–1931)

This is a list of parliamentary by-elections in the United Kingdom held between 1918 and 1931, with the names of the incumbent and victor and their respective parties. Where seats changed political party at the election, the result is highlighted: red for a Labour gain, blue for a Conservative gain, orange for a Liberal gain, and grey for any other gain. A total of 233 by-elections were held during this period.

Resignations

 * See Resignation from the British House of Commons for more details.

Where the cause of by-election is given as "resignation" or "seeks re-election", this indicates that the incumbent was appointed on his or her own request to an "office of profit under the Crown", either the Steward of the Chiltern Hundreds or the Steward of the Manor of Northstead. These appointments are made as a constitutional device for leaving the House of Commons, whose Members are not permitted to resign.

By-elections
{| class="wikitable"
 * colspan=9|
 * colspan=9|

35th Parliament (1929–1931)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Cause
 * Guildford
 * 25 August 1931
 * Henry Buckingham
 * Charles Rhys
 * Death
 * Liverpool Wavertree
 * 23 June 1931
 * John Tinné
 * Ronald Nall-Cain
 * Resignation
 * Manchester Ardwick
 * 22 June 1931
 * Thomas Lowth
 * Joseph Henderson
 * Death
 * Gateshead
 * 8 June 1931
 * James Melville
 * Herbert Evans
 * Death
 * Rutherglen
 * 21 May 1931
 * William Wright
 * David Hardie
 * Death
 * Stroud
 * 21 May 1931
 * Sir Frank Nelson
 * Walter Perkins
 * Resignation
 * Ogmore
 * 19 May 1931
 * Vernon Hartshorn
 * Edward Williams
 * Death
 * Glasgow St Rollox
 * 7 May 1931
 * James Stewart
 * William Leonard
 * Death
 * Scarborough and Whitby
 * 6 May 1931
 * Sidney Herbert
 * Paul Latham
 * Resignation
 * - bgcolor=lightblue
 * Ashton-under-Lyne
 * 30 April 1931
 * Albert Bellamy
 * John Broadbent
 * Death
 * Woolwich East
 * 15 April 1931
 * Henry Snell
 * George Hicks
 * Elevation to the peerage
 * - bgcolor=lightblue
 * Sunderland
 * 26 March 1931
 * Alfred Smith
 * Luke Thompson
 * Death
 * Pontypridd
 * 19 March 1931
 * Thomas Isaac Mardy Jones
 * David Lewis Davies
 * Resignation
 * Westminster St George's
 * 19 March 1931
 * Laming Worthington-Evans
 * Duff Cooper
 * Death
 * Salisbury
 * 11 March 1931
 * Hugh Morrison
 * James Despencer-Robertson
 * Resignation
 * Fermanagh and Tyrone
 * 7 March 1931
 * Thomas Harbison
 * Cahir Healy
 * Death
 * Fareham
 * 20 February 1931
 * John Davidson
 * Thomas Inskip
 * Resignation
 * Islington East
 * 19 February 1931
 * Ethel Bentham
 * Leah Manning
 * Death
 * Liverpool East Toxteth
 * 5 February 1931
 * Henry Mond
 * Patrick Buchan-Hepburn
 * Succession to the peerage
 * Bristol East
 * 16 January 1931
 * Walter Baker
 * Stafford Cripps
 * Death
 * Whitechapel and St George's
 * 3 December 1930
 * Harry Gosling
 * J. H. Hall
 * Death
 * East Renfrewshire
 * 28 November 1930
 * Alexander Munro MacRobert
 * Douglas Douglas-Hamilton
 * Death
 * - bgcolor=lightblue
 * Shipley
 * 6 November 1930
 * William Mackinder
 * James Lockwood
 * Death
 * - bgcolor=#c0c0c0
 * Paddington South
 * 30 October 1930
 * Douglas King
 * Ernest Taylor
 * Death
 * Bromley
 * 2 September 1930
 * Cuthbert James
 * Edward Campbell
 * Death
 * North Norfolk
 * 9 July 1930
 * Noel Buxton
 * Lucy Noel-Buxton
 * Elevation to the peerage
 * Glasgow Shettleston
 * 26 June 1930
 * John Wheatley
 * John McGovern
 * Death
 * Nottingham Central
 * 27 May 1930
 * Albert Bennett
 * Terence O'Connor
 * Resignation
 * - bgcolor=lightblue
 * Fulham West
 * 6 May 1930
 * Ernest Spero
 * Cyril Cobb
 * Resignation
 * Sheffield Brightside
 * 6 February 1930
 * Arthur Ponsonby
 * Fred Marshall
 * Elevated to the peerage
 * - bgcolor=pink
 * Liverpool Scotland
 * 14 December 1929
 * T. P. O'Connor
 * David Logan
 * Death
 * Tamworth
 * 2 December 1929
 * Edward Iliffe
 * Arthur Steel-Maitland
 * Resignation
 * Kilmarnock
 * 27 September 1929
 * Robert Climie
 * Craigie Aitchison
 * Death
 * Twickenham
 * 8 August 1929
 * William Joynson-Hicks
 * John Ferguson
 * Elevated to the peerage
 * Leeds South East
 * 1 August 1929
 * Henry Slesser
 * James Milner
 * Resignation
 * - bgcolor=pink
 * Preston
 * 31 July 1929
 * William Jowitt
 * William Jowitt
 * Seeks re-election upon change of party allegiance
 * colspan=9|
 * Ernest Taylor
 * Death
 * Bromley
 * 2 September 1930
 * Cuthbert James
 * Edward Campbell
 * Death
 * North Norfolk
 * 9 July 1930
 * Noel Buxton
 * Lucy Noel-Buxton
 * Elevation to the peerage
 * Glasgow Shettleston
 * 26 June 1930
 * John Wheatley
 * John McGovern
 * Death
 * Nottingham Central
 * 27 May 1930
 * Albert Bennett
 * Terence O'Connor
 * Resignation
 * - bgcolor=lightblue
 * Fulham West
 * 6 May 1930
 * Ernest Spero
 * Cyril Cobb
 * Resignation
 * Sheffield Brightside
 * 6 February 1930
 * Arthur Ponsonby
 * Fred Marshall
 * Elevated to the peerage
 * - bgcolor=pink
 * Liverpool Scotland
 * 14 December 1929
 * T. P. O'Connor
 * David Logan
 * Death
 * Tamworth
 * 2 December 1929
 * Edward Iliffe
 * Arthur Steel-Maitland
 * Resignation
 * Kilmarnock
 * 27 September 1929
 * Robert Climie
 * Craigie Aitchison
 * Death
 * Twickenham
 * 8 August 1929
 * William Joynson-Hicks
 * John Ferguson
 * Elevated to the peerage
 * Leeds South East
 * 1 August 1929
 * Henry Slesser
 * James Milner
 * Resignation
 * - bgcolor=pink
 * Preston
 * 31 July 1929
 * William Jowitt
 * William Jowitt
 * Seeks re-election upon change of party allegiance
 * colspan=9|
 * Resignation
 * Kilmarnock
 * 27 September 1929
 * Robert Climie
 * Craigie Aitchison
 * Death
 * Twickenham
 * 8 August 1929
 * William Joynson-Hicks
 * John Ferguson
 * Elevated to the peerage
 * Leeds South East
 * 1 August 1929
 * Henry Slesser
 * James Milner
 * Resignation
 * - bgcolor=pink
 * Preston
 * 31 July 1929
 * William Jowitt
 * William Jowitt
 * Seeks re-election upon change of party allegiance
 * colspan=9|
 * James Milner
 * Resignation
 * - bgcolor=pink
 * Preston
 * 31 July 1929
 * William Jowitt
 * William Jowitt
 * Seeks re-election upon change of party allegiance
 * colspan=9|
 * Seeks re-election upon change of party allegiance
 * colspan=9|
 * colspan=9|
 * colspan=9|

34th Parliament (1924–1929)
!By-election !! Date !! Incumbent !! colspan="2" | Party !! Winner !! colspan="2" | Party !! Cause
 * - bgcolor=pink
 * North Lanarkshire
 * 21 March 1929
 * Alexander Sprot
 * Jennie Lee
 * Death
 * - bgcolor=FFCC66
 * Holland with Boston
 * 21 March 1929
 * Arthur Dean
 * James Blindell
 * Death
 * Bath
 * 21 March 1929
 * Charles Foxcroft
 * Charles Baillie-Hamilton
 * Death
 * - bgcolor=FFCC66
 * Eddisbury
 * 20 March 1929
 * Harry Barnston
 * Richard John Russell
 * Death
 * Liverpool East Toxteth
 * 19 March 1929
 * Albert Edward Jacob
 * Henry Mond
 * Death
 * Wansbeck
 * 13 February 1929
 * George Warne
 * George Shield
 * Death
 * Bishop Auckland
 * 7 February 1929
 * Ben Spoor
 * Ruth Dalton
 * Death
 * - bgcolor=pink
 * Battersea South
 * 7 February 1929
 * Francis Curzon
 * William Bennett
 * Succession to the peerage
 * Londonderry
 * 29 January 1929
 * Malcolm Macnaghten
 * Ronald Ross
 * Appointment as High Court judge
 * - bgcolor=pink
 * Midlothian and Peeblesshire Northern
 * 29 January 1929
 * George Hutchison
 * Andrew Clarke
 * Death
 * - bgcolor=pink
 * Ashton-under-Lyne
 * 29 October 1928
 * Cornelius Homan
 * Albert Bellamy
 * Declared bankrupt
 * Tavistock
 * 11 October 1928
 * Philip Kenyon-Slaney
 * Wallace Duffield Wright
 * Death
 * Cheltenham
 * 26 September 1928
 * James Agg-Gardner
 * Walter Preston
 * Death
 * Aberdeen North
 * 16 August 1928
 * Frank Herbert Rose
 * William Wedgwood Benn
 * Death
 * Sheffield Hallam
 * 16 July 1928
 * Frederick Sykes
 * Louis Smith
 * Appointed Governor of Bombay
 * - bgcolor=pink
 * Halifax
 * 13 July 1928
 * John Henry Whitley
 * Arthur Longbottom
 * Resignation (retired as Speaker)
 * Epsom
 * 4 July 1928
 * George Blades
 * Archibald Southby
 * Elevation to the peerage
 * Carmarthen
 * 28 June 1928
 * Alfred Mond
 * /Conservative
 * William Nathaniel Jones
 * Elevation to the Hereditary Peerage
 * Holborn
 * 28 June 1928
 * James Remnant
 * Stuart Bevan
 * Elevation to the peerage
 * St Marylebone
 * 30 April 1928
 * Sir Douglas Hogg
 * Rennell Rodd
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * Hanley
 * 23 April 1928
 * Samuel Clowes
 * Arthur Hollins
 * Death
 * - bgcolor=pink
 * Linlithgowshire
 * 4 April 1928
 * James Kidd
 * Manny Shinwell
 * Death
 * Middlesbrough West
 * 7 March 1928
 * Trevelyan Thomson
 * Frank Kingsley Griffith
 * Death
 * - bgcolor=FFCC66
 * St Ives
 * 6 March 1928
 * Anthony Hawke
 * Hilda Runciman
 * Appointment as a High Court Judge
 * Ilford
 * 23 February 1928
 * Fredric Wise
 * George Hamilton
 * Death
 * - bgcolor=FFCC66
 * Lancaster
 * 9 February 1928
 * Gerald Strickland
 * Robert Parkinson Tomlinson
 * Elevation to the Hereditary Peerage
 * Bristol West
 * 2 February 1928
 * George Gibbs
 * Cyril Culverwell
 * Elevation to the peerage
 * Faversham
 * 25 January 1928
 * Granville Wheler
 * Adam Maitland
 * Death
 * - bgcolor=pink
 * Northampton
 * 9 January 1928
 * Arthur Holland
 * Cecil L'Estrange Malone
 * Death
 * Canterbury
 * 24 November 1927
 * Ronald McNeill
 * William Wayland
 * Elevation to the peerage
 * Southend
 * 19 November 1927
 * Rupert Guinness
 * Gwendolen Guinness
 * Succession to the peerage
 * Brixton
 * 27 June 1927
 * Davison Dalziel
 * Nigel Colman
 * Elevation to the peerage
 * Westbury
 * 16 June 1927
 * Walter William Shaw
 * Richard Long
 * Death
 * - bgcolor=FFCC66
 * Bosworth
 * 31 May 1927
 * Robert Gee
 * William Edge
 * Resignation
 * Combined Scottish Universities
 * 26–29 April 1927
 * Henry Craik
 * John Buchan
 * Death
 * - bgcolor=FFCC66
 * Southwark North
 * 28 March 1927
 * Leslie Haden-Guest
 * Edward Strauss
 * Sought re-election upon change of party allegiance
 * Leith
 * 23 March 1927
 * William Wedgwood Benn
 * Ernest Brown
 * Resignation
 * - bgcolor=pink
 * Stourbridge
 * 23 February 1927
 * Douglas Pielou
 * Wilfred Wellock
 * Death
 * Smethwick
 * 21 December 1926
 * John Davison
 * Oswald Mosley
 * Resignation
 * Chelmsford
 * 30 November 1926
 * Henry Curtis-Bennett
 * Charles Howard-Bury
 * Resignation
 * - bgcolor=pink
 * Kingston-upon-Hull Central
 * 29 November 1926
 * Joseph Kenworthy
 * Joseph Kenworthy
 * Seeks re-election upon change of party allegiance
 * Howdenshire
 * 25 November 1926
 * Stanley Jackson
 * William Carver
 * Resignation
 * North Cumberland
 * 17 September 1926
 * Donald Howard
 * Fergus Graham
 * Succession to the peerage
 * Wallsend
 * 21 July 1926
 * Patrick Hastings
 * Margaret Bondfield
 * Resignation
 * - bgcolor=pink
 * Hammersmith North
 * 20 May 1926
 * Ellis Ashmead-Bartlett
 * James Patrick Gardner
 * Resignation
 * Buckrose
 * 5 May 1926
 * Guy Gaunt
 * Albert Braithwaite
 * Resignation
 * - bgcolor=pink
 * East Ham North
 * 29 April 1926
 * Charles Williamson Crook
 * Susan Lawrence
 * Death
 * Bothwell
 * 26 March 1926
 * John Robertson
 * Joseph Sullivan
 * Death
 * - bgcolor=lightblue
 * Combined English Universities
 * 8–12 March 1926
 * Herbert Albert Laurens Fisher
 * Alfred Hopkinson
 * Resignation
 * - bgcolor=pink
 * Darlington
 * 17 February 1926
 * William Edwin Pease
 * Arthur Lewis Shepherd
 * Death
 * Cambridge University
 * 13 February 1926
 * John Rawlinson
 * John James Withers
 * Death
 * East Renfrewshire
 * 29 January 1926
 * Alexander Munro MacRobert
 * Alexander Munro MacRobert
 * Appointed Solicitor General for Scotland
 * Dunbartonshire
 * 29 January 1926
 * David Fleming
 * John Thom
 * Appointed to the Court of Session
 * Ripon
 * 5 December 1925
 * Edward Wood
 * John Waller Hills
 * Resignation
 * Bury St Edmunds
 * 1 December 1925
 * Walter Guinness
 * Walter Guinness
 * Appointed Minister of Agriculture and Fisheries
 * Galloway
 * 17 November 1925
 * Arthur Henniker-Hughan
 * Sidney Streatfield
 * Death
 * - bgcolor=pink
 * Stockport
 * 17 September 1925
 * William Greenwood
 * Arnold Townend
 * Death
 * Forest of Dean
 * 14 July 1925
 * James Wignall
 * A. A. Purcell
 * Death
 * Oldham
 * 24 June 1925
 * Edward Grigg
 * William Wiggins
 * Resignation
 * Eastbourne
 * 17 June 1925
 * George Lloyd
 * William Reginald Hall
 * Resignation
 * Ayr Burghs
 * 12 June 1925
 * John Baird
 * Thomas Moore
 * Appointed Governor-General of Australia
 * Walsall
 * 27 February 1925
 * William Preston
 * William Preston
 * Disqualification
 * Dundee
 * 22 December 1924
 * E. D. Morel
 * Thomas Johnston
 * Death
 * colspan="9"|
 * North Cumberland
 * 17 September 1926
 * Donald Howard
 * Fergus Graham
 * Succession to the peerage
 * Wallsend
 * 21 July 1926
 * Patrick Hastings
 * Margaret Bondfield
 * Resignation
 * - bgcolor=pink
 * Hammersmith North
 * 20 May 1926
 * Ellis Ashmead-Bartlett
 * James Patrick Gardner
 * Resignation
 * Buckrose
 * 5 May 1926
 * Guy Gaunt
 * Albert Braithwaite
 * Resignation
 * - bgcolor=pink
 * East Ham North
 * 29 April 1926
 * Charles Williamson Crook
 * Susan Lawrence
 * Death
 * Bothwell
 * 26 March 1926
 * John Robertson
 * Joseph Sullivan
 * Death
 * - bgcolor=lightblue
 * Combined English Universities
 * 8–12 March 1926
 * Herbert Albert Laurens Fisher
 * Alfred Hopkinson
 * Resignation
 * - bgcolor=pink
 * Darlington
 * 17 February 1926
 * William Edwin Pease
 * Arthur Lewis Shepherd
 * Death
 * Cambridge University
 * 13 February 1926
 * John Rawlinson
 * John James Withers
 * Death
 * East Renfrewshire
 * 29 January 1926
 * Alexander Munro MacRobert
 * Alexander Munro MacRobert
 * Appointed Solicitor General for Scotland
 * Dunbartonshire
 * 29 January 1926
 * David Fleming
 * John Thom
 * Appointed to the Court of Session
 * Ripon
 * 5 December 1925
 * Edward Wood
 * John Waller Hills
 * Resignation
 * Bury St Edmunds
 * 1 December 1925
 * Walter Guinness
 * Walter Guinness
 * Appointed Minister of Agriculture and Fisheries
 * Galloway
 * 17 November 1925
 * Arthur Henniker-Hughan
 * Sidney Streatfield
 * Death
 * - bgcolor=pink
 * Stockport
 * 17 September 1925
 * William Greenwood
 * Arnold Townend
 * Death
 * Forest of Dean
 * 14 July 1925
 * James Wignall
 * A. A. Purcell
 * Death
 * Oldham
 * 24 June 1925
 * Edward Grigg
 * William Wiggins
 * Resignation
 * Eastbourne
 * 17 June 1925
 * George Lloyd
 * William Reginald Hall
 * Resignation
 * Ayr Burghs
 * 12 June 1925
 * John Baird
 * Thomas Moore
 * Appointed Governor-General of Australia
 * Walsall
 * 27 February 1925
 * William Preston
 * William Preston
 * Disqualification
 * Dundee
 * 22 December 1924
 * E. D. Morel
 * Thomas Johnston
 * Death
 * colspan="9"|
 * - bgcolor=pink
 * Stockport
 * 17 September 1925
 * William Greenwood
 * Arnold Townend
 * Death
 * Forest of Dean
 * 14 July 1925
 * James Wignall
 * A. A. Purcell
 * Death
 * Oldham
 * 24 June 1925
 * Edward Grigg
 * William Wiggins
 * Resignation
 * Eastbourne
 * 17 June 1925
 * George Lloyd
 * William Reginald Hall
 * Resignation
 * Ayr Burghs
 * 12 June 1925
 * John Baird
 * Thomas Moore
 * Appointed Governor-General of Australia
 * Walsall
 * 27 February 1925
 * William Preston
 * William Preston
 * Disqualification
 * Dundee
 * 22 December 1924
 * E. D. Morel
 * Thomas Johnston
 * Death
 * colspan="9"|
 * Thomas Moore
 * Appointed Governor-General of Australia
 * Walsall
 * 27 February 1925
 * William Preston
 * William Preston
 * Disqualification
 * Dundee
 * 22 December 1924
 * E. D. Morel
 * Thomas Johnston
 * Death
 * colspan="9"|
 * 22 December 1924
 * E. D. Morel
 * Thomas Johnston
 * Death
 * colspan="9"|
 * Death
 * colspan="9"|
 * colspan="9"|

33rd Parliament (1923–1924)
!By-election !! Date !! Incumbent !! colspan="2" | Party !! Winner !! colspan="2" | Party !! Cause
 * Carmarthen
 * 14 August 1924
 * Ellis Ellis-Griffith
 * Alfred Mond
 * Resignation
 * - bgcolor=lightblue
 * Holland with Boston
 * 31 July 1924
 * William Royce
 * Arthur Dean
 * Death
 * Lewes
 * 9 July 1924
 * William Campion
 * Tufton Beamish
 * Appointment as Governor of Western Australia
 * - bgcolor=lightblue
 * Oxford
 * 5 June 1924
 * Frank Gray
 * Robert Bourne
 * Election declared void
 * Glasgow Kelvingrove
 * 23 May 1924
 * William Hutchison
 * Walter Elliot
 * Death
 * - bgcolor=pink
 * Liverpool West Toxteth
 * 22 May 1924
 * Robert Houston
 * Joseph Gibbins
 * Resignation
 * Westminster Abbey
 * 19 March 1924
 * John Nicholson
 * Otho Nicholson
 * Death
 * Dover
 * 12 March 1924
 * John Astor
 * John Astor
 * Voted before taking the Oath of Allegiance
 * Burnley
 * 28 February 1924
 * David Irving
 * Arthur Henderson
 * Death
 * City of London
 * 1 February 1924
 * Frederick Banbury
 * Vansittart Bowater
 * Elevation to the peerage
 * colspan=9|
 * Death
 * Dover
 * 12 March 1924
 * John Astor
 * John Astor
 * Voted before taking the Oath of Allegiance
 * Burnley
 * 28 February 1924
 * David Irving
 * Arthur Henderson
 * Death
 * City of London
 * 1 February 1924
 * Frederick Banbury
 * Vansittart Bowater
 * Elevation to the peerage
 * colspan=9|
 * Death
 * City of London
 * 1 February 1924
 * Frederick Banbury
 * Vansittart Bowater
 * Elevation to the peerage
 * colspan=9|
 * Elevation to the peerage
 * colspan=9|
 * colspan=9|
 * colspan=9|

32nd Parliament (1922–1923)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Cause
 * Yeovil
 * 30 October 1923
 * Aubrey Herbert
 * George Davies
 * Death
 * Rutland and Stamford
 * 30 October 1923
 * Charles Harvey Dixon
 * Neville Smith-Carington
 * Death
 * Portsmouth South
 * 13 August 1923
 * Leslie Orme Wilson
 * Herbert Cayzer
 * Resignation
 * Leeds Central
 * 26 July 1923
 * Arthur Wellesley Willey
 * Charles Henry Wilson
 * Death
 * - bgcolor=FFCC66
 * Tiverton
 * 21 June 1923
 * Herbert Sparkes
 * Francis Dyke Acland
 * Death
 * Morpeth
 * 21 June 1923
 * John Cairns
 * Robert Smillie
 * Death
 * - bgcolor=lightblue
 * Berwick-upon-Tweed
 * 31 May 1923
 * Hilton Philipson
 * Mabel Philipson
 * Void election (electoral fraud)
 * Ludlow
 * 19 April 1923
 * Ivor Windsor-Clive
 * George Windsor-Clive
 * Succession to the peerage
 * - bgcolor=FFCC66
 * Anglesey
 * 7 April 1923
 * Owen Thomas
 * Labour
 * Robert Thomas
 * Death
 * - bgcolor=pink
 * Liverpool Edge Hill
 * 6 March 1923
 * William Rutherford
 * Jack Hayes
 * Resignation
 * - bgcolor=pink
 * Mitcham
 * 3 March 1923
 * Thomas Worsfold
 * James Chuter Ede
 * Resignation
 * - bgcolor=FFCC66
 * Willesden East
 * 3 March 1923
 * Harry Mallaby-Deeley
 * Harcourt Johnstone
 * Resignation
 * Darlington
 * 28 February 1923
 * Herbert Pease
 * William Edwin Pease
 * Elevation to the peerage
 * Whitechapel and St George's
 * 8 February 1923
 * Charles James Mathew
 * Harry Gosling
 * Death
 * Newcastle-upon-Tyne East
 * 17 January 1923
 * Joseph Nicholas Bell
 * Arthur Henderson
 * Death
 * Portsmouth South
 * 13 December 1922
 * Herbert Cayzer
 * Leslie Orme Wilson
 * Resignation
 * colspan=9|
 * - bgcolor=FFCC66
 * Willesden East
 * 3 March 1923
 * Harry Mallaby-Deeley
 * Harcourt Johnstone
 * Resignation
 * Darlington
 * 28 February 1923
 * Herbert Pease
 * William Edwin Pease
 * Elevation to the peerage
 * Whitechapel and St George's
 * 8 February 1923
 * Charles James Mathew
 * Harry Gosling
 * Death
 * Newcastle-upon-Tyne East
 * 17 January 1923
 * Joseph Nicholas Bell
 * Arthur Henderson
 * Death
 * Portsmouth South
 * 13 December 1922
 * Herbert Cayzer
 * Leslie Orme Wilson
 * Resignation
 * colspan=9|
 * Joseph Nicholas Bell
 * Arthur Henderson
 * Death
 * Portsmouth South
 * 13 December 1922
 * Herbert Cayzer
 * Leslie Orme Wilson
 * Resignation
 * colspan=9|
 * Leslie Orme Wilson
 * Resignation
 * colspan=9|
 * Resignation
 * colspan=9|
 * colspan=9|

31st Parliament (1919–1922)
Some precise party allegiances are difficult to determine as during this Parliament the Liberal and Conservative Parties were both divided over whether or not to continue support for the Lloyd George Coalition Government. Some opponents of the Coalition ran and/or sat as Independent Liberals or Conservatives respectively; however other opponents were able to secure official nominations. It is not always clear just where an individual MP or officially endorsed candidate stood on the Coalition at the point of election and there are several who appear to have given ambiguous information at the time or to have switched wings once in Parliament. !By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Cause (bankruptcy)
 * - bgcolor=lightblue
 * Newport (Monmouthshire)
 * 18 October 1922
 * Lewis Haslam
 * Reginald Clarry
 * Death
 * - bgcolor=lightblue
 * Hackney South
 * 18 August 1922
 * Horatio Bottomley
 * Clifford Erskine-Bolst
 * Expelled from the House (convicted of fraud)
 * - bgcolor=pink
 * Pontypridd
 * 25 July 1922
 * Thomas Arthur Lewis
 * Thomas Isaac Mardy Jones
 * Appointed as a Junior Lord of the Treasury
 * North Down
 * 21 July 1922
 * Henry Wilson
 * John Morrow Simms
 * Death (assassinated by IRA)
 * Gower
 * 20 July 1922
 * John Williams
 * David Grenfell
 * Death
 * Nottingham East
 * 29 June 1922
 * John David Rees
 * John Houfton
 * Death
 * Banbury
 * 22 June 1922
 * Rhys Rhys-Williams
 * Rhys Rhys-Williams
 * Appointed Recorder of Cardiff
 * Moray and Nairn
 * 21 June 1922
 * Archibald Williamson
 * Thomas Maule Guthrie
 * Elevation to the peerage
 * Newbury
 * 10 June 1922
 * William Mount
 * Howard Clifton Brown
 * Resignation
 * North Londonderry
 * 4 June 1922
 * Hugh T. Barrie
 * Malcolm Macnaghten
 * Death
 * City of London
 * 19 May 1922
 * Arthur Balfour
 * Edward Grenfell
 * Elevation to the peerage
 * Clapham
 * 9 May 1922
 * Arthur du Cros
 * John Leigh
 * Resignation
 * - bgcolor=pink
 * Leicester East
 * 30 March 1922
 * Gordon Hewart
 * George Banton
 * Appointment as Lord Chief Justice of England and Wales
 * Chertsey
 * 24 March 1922
 * Donald MacMaster
 * Philip Richardson
 * Death
 * Inverness
 * 16 March 1922
 * Thomas Brash Morison
 * Murdoch MacDonald
 * Resignation
 * Cambridge
 * 16 March 1922
 * Eric Geddes
 * George Newton
 * Resignation
 * Liverpool Exchange
 * 13 March 1922
 * Leslie Scott
 * Leslie Scott
 * Appointed as Solicitor General
 * Wolverhampton West
 * 7 March 1922
 * Alfred Bird
 * Robert Bird
 * Death
 * - bgcolor=FFCC66
 * Bodmin
 * 24 February 1922
 * Charles Hanson
 * Isaac Foot
 * Death
 * North Down
 * 21 February 1922
 * Thomas Watters Brown
 * Henry Wilson
 * Appointed to the High Court of Northern Ireland
 * - bgcolor=pink
 * Camberwell North
 * 20 February 1922
 * Henry Newton Knights
 * Charles Ammon
 * Resignation
 * Death
 * Inverness
 * 16 March 1922
 * Thomas Brash Morison
 * Murdoch MacDonald
 * Resignation
 * Cambridge
 * 16 March 1922
 * Eric Geddes
 * George Newton
 * Resignation
 * Liverpool Exchange
 * 13 March 1922
 * Leslie Scott
 * Leslie Scott
 * Appointed as Solicitor General
 * Wolverhampton West
 * 7 March 1922
 * Alfred Bird
 * Robert Bird
 * Death
 * - bgcolor=FFCC66
 * Bodmin
 * 24 February 1922
 * Charles Hanson
 * Isaac Foot
 * Death
 * North Down
 * 21 February 1922
 * Thomas Watters Brown
 * Henry Wilson
 * Appointed to the High Court of Northern Ireland
 * - bgcolor=pink
 * Camberwell North
 * 20 February 1922
 * Henry Newton Knights
 * Charles Ammon
 * Resignation
 * Isaac Foot
 * Death
 * North Down
 * 21 February 1922
 * Thomas Watters Brown
 * Henry Wilson
 * Appointed to the High Court of Northern Ireland
 * - bgcolor=pink
 * Camberwell North
 * 20 February 1922
 * Henry Newton Knights
 * Charles Ammon
 * Resignation
 * 20 February 1922
 * Henry Newton Knights
 * Charles Ammon
 * Resignation
 * Resignation
 * Resignation
 * - bgcolor=pink
 * Manchester Clayton
 * 18 February 1922
 * Edward Hopkinson
 * John Edward Sutton
 * Death
 * West Down
 * 17 February 1922
 * Thomas Browne Wallace
 * Hugh Hayes
 * Appointed Chief Clerk to the High Court of Northern Ireland
 * South Londonderry
 * 18 January 1922
 * Robert Chichester
 * William Hacket Pain
 * Death
 * Tamworth
 * 17 January 1922
 * Henry Wilson-Fox
 * Percy Newson
 * Death
 * Ludlow
 * 4 January 1922
 * Beville Stanier
 * Ivor Windsor-Clive
 * Death
 * - bgcolor=pink
 * Southwark South East
 * 14 December 1921
 * James Arthur Dawes
 * Thomas Naylor
 * Death
 * Hornsey
 * 10 November 1921
 * Kennedy Jones
 * William Ward
 * Death
 * Westhoughton
 * 5 October 1921
 * William Wilson
 * Rhys Davies
 * Death
 * Louth
 * 22 September 1921
 * Thomas Wintringham
 * Margaret Wintringham
 * Death
 * Lewisham West
 * 13 September 1921
 * Edward Coates
 * Philip Dawson
 * Death
 * South Londonderry
 * 29 August 1921
 * Denis Henry
 * Robert Chichester
 * Appointed Lord Chief Justice of Northern Ireland
 * Westminster Abbey
 * 25 August 1921
 * William Burdett-Coutts
 * John Sanctuary Nicholson
 * Death
 * Caerphilly
 * 24 August 1921
 * Alfred Onions
 * Morgan Jones
 * Death
 * - bgcolor="#c0c0c0"
 * Hertford
 * 16 July 1921
 * Noel Pemberton Billing
 * Murray Sueter
 * and Independent
 * Resignation (ill-health)
 * - bgcolor=pink
 * Heywood and Radcliffe
 * 8 June 1921
 * Albert Illingworth
 * Walter Halls
 * Elevation to the peerage
 * - bgcolor=#c0c0c0
 * Westminster St George's
 * 7 July 1921
 * Walter Long
 * James Malcolm Monteith Erskine
 * Elevation to the peerage
 * West Down
 * 5 July 1921
 * Daniel Martin Wilson
 * Thomas Browne Wallace
 * Appointed Recorder of Belfast
 * Mid Down
 * 2 July 1921
 * James Craig
 * Robert Sharman-Crawford
 * Elected Prime Minister of Northern Ireland
 * Mid Armagh
 * 23 June 1921
 * James Rolston Lonsdale
 * Henry Bruce Armstrong
 * Death
 * Belfast Duncairn
 * 23 June 1921
 * Edward Carson
 * Thomas Edward McConnell
 * Appointed Lord of Appeal in Ordinary
 * North Down
 * 23 June 1921
 * Thomas Watters Brown
 * Thomas Watters Brown
 * Appointed Solicitor-General for Ireland
 * Orkney and Shetland
 * 17 May 1921
 * Cathcart Wason
 * Malcolm Smith
 * Death
 * Abingdon
 * 14 May 1921
 * John Tyson Wigan
 * Arthur Loyd
 * Resignation
 * Penrith and Cockermouth
 * 13 May 1921
 * James Lowther
 * Cecil Lowther
 * Resignation
 * Hastings
 * 4 May 1921
 * Laurance Lyon
 * Eustace Percy
 * Resignation
 * Chichester
 * 23 April 1921
 * Edmund Talbot
 * William Bird
 * Resignation
 * Bedford
 * 23 April 1921
 * Frederick Kellaway
 * Frederick Kellaway
 * Appointed Postmaster General
 * Bewdley
 * 19 April 1921
 * Stanley Baldwin
 * Stanley Baldwin
 * Appointed President of the Board of Trade
 * Eddisbury
 * 19 April 1921
 * Harry Barnston
 * Harry Barnston
 * Appointed Comptroller of the Household
 * East Dorset
 * 16 April 1921
 * Frederick Guest
 * Frederick Guest
 * Appointed Secretary of State for Air
 * Glasgow Pollok
 * 14 April 1921
 * John Gilmour
 * John Gilmour
 * Appointed Junior Lord of the Treasury
 * Bristol West
 * 9 April 1921
 * George Gibbs
 * George Gibbs
 * Appointed Treasurer of the Household
 * Taunton
 * 8 April 1921
 * Dennis Boles
 * Arthur Griffith-Boscawen
 * Resignation
 * Birmingham West
 * 31 March 1921
 * Austen Chamberlain
 * Austen Chamberlain
 * Appointed Lord Privy Seal
 * - bgcolor=pink
 * Penistone
 * 5 March 1921
 * Sydney Arnold
 * William Gillis
 * Resignation
 * - bgcolor=pink
 * Kirkcaldy Burghs
 * 4 March 1921
 * Henry Dalziel
 * Tom Kennedy
 * Resignation
 * Birmingham Moseley
 * 4 March 1921
 * Hallewell Rogers
 * Patrick Hannon
 * Resignation
 * - bgcolor=pink
 * Dudley
 * 3 March 1921
 * Arthur Griffith-Boscawen
 * James Wilson
 * Appointment as Minister of Agriculture
 * - bgcolor=lightblue
 * Woolwich East
 * 2 March 1921
 * Will Crooks
 * Robert Gee
 * Death
 * Cardiganshire
 * 18 February 1921
 * Matthew Vaughan-Davies
 * Ernest Evans
 * Elevated to the peerage
 * - bgcolor=#c0c0c0
 * Dover
 * 12 January 1921
 * Vere Ponsonby
 * Thomas Andrew Polson
 * Succession to the Peerage
 * Hereford
 * 11 January 1921
 * Charles Pulley
 * Samuel Roberts
 * Resignation
 * Abertillery
 * 21 December 1920
 * William Brace
 * George Barker
 * Resignation
 * Rhondda West
 * 21 December 1920
 * William Abraham
 * William John
 * Resignation
 * Middleton and Prestwich
 * 22 November 1920
 * William Adkins
 * William Adkins
 * Appointed Recorder of Birmingham
 * - bgcolor="#c0c0c0"
 * The Wrekin
 * 20 November 1920
 * Charles Frederick Palmer
 * C. V. F. Townshend
 * Death
 * Hemel Hempstead
 * 9 November 1920
 * Gustavus Talbot
 * J. C. C. Davidson
 * Death
 * Ilford
 * 25 September 1920
 * William Peter Griggs
 * Fredric Wise
 * Death
 * Woodbridge
 * 28 July 1920
 * Robert Francis Peel
 * Arthur Churchman
 * Resignation
 * - bgcolor=pink
 * South Norfolk
 * 27 July 1920
 * William Cozens-Hardy
 * George Edwards
 * Succession to the peerage
 * Ebbw Vale
 * 26 July 1920
 * Thomas Richards
 * Evan Davies
 * Resignation
 * Nelson and Colne
 * 17 June 1920
 * Albert Smith
 * Robinson Graham
 * Resignation
 * - bgcolor=FFCC66
 * Louth
 * 3 June 1920
 * Henry Langton Brackenbury
 * Thomas Wintringham
 * Death
 * Sunderland
 * 24 April 1920
 * Hamar Greenwood
 * Hamar Greenwood
 * Appointed Chief Secretary for Ireland
 * Edinburgh North
 * 9 April 1920
 * James Avon Clyde
 * Patrick Ford
 * Resignation
 * Edinburgh South
 * 9 April 1920
 * Charles Murray
 * Charles Murray
 * Appointed Solicitor General for Scotland
 * Northampton
 * 1 April 1920
 * Charles McCurdy
 * Charles McCurdy
 * Appointed Minister of Food Control
 * Basingstoke
 * 31 March 1920
 * Auckland Geddes
 * Arthur Holbrook
 * Resignation
 * Camberwell North West
 * 31 March 1920
 * Thomas James McNamara
 * Thomas James McNamara
 * Appointed Minister of Labour
 * - bgcolor=pink
 * Dartford
 * 27 March 1920
 * James Rowlands
 * John Edmund Mills
 * Death
 * rowspan=2|Stockport
 * rowspan=2|27 March 1920
 * Spencer Leigh Hughes
 * Henry Fildes
 * Death
 * - bgcolor=lightblue
 * George Wardle
 * William Greenwood
 * Resignation
 * Argyll
 * 10 March 1920
 * William Sutherland
 * William Sutherland
 * Appointed as a Junior Lord of the Treasury
 * Horncastle
 * 25 February 1920
 * William Weigall
 * Stafford Vere Hotchkin
 * Appointed Governor of South Australia
 * Paisley
 * 12 February 1920
 * John Mills McCallum
 * H. H. Asquith
 * Death
 * - bgcolor="#c0c0c0"
 * The Wrekin
 * 7 February 1920
 * Charles Solomon Henry
 * Charles Frederick Palmer
 * Death
 * Ashton-under-Lyne
 * 31 January 1920
 * Albert Stanley
 * Walter de Frece
 * Elevation to the peerage
 * - bgcolor=pink
 * Spen Valley
 * 20 December 1919
 * Thomas Whittaker
 * Tom Myers
 * Death
 * Bromley
 * 17 December 1919
 * Henry Forster
 * Cuthbert James
 * Elevation to the peerage
 * St Albans
 * 10 December 1919
 * Hildred Carlile
 * Francis Fremantle
 * Resignation
 * Plymouth Sutton
 * 28 November 1919
 * Waldorf Astor
 * Nancy Astor
 * Succession to the peerage
 * Isle of Thanet
 * 15 November 1919
 * Norman Carlyle Craig
 * Esmond Harmsworth
 * Death
 * Croydon South
 * 14 November 1919
 * Ian Malcolm
 * Allan Smith
 * Resignation
 * Chester-le-Street
 * 13 November 1919
 * John Wilkinson Taylor
 * Jack Lawson
 * Resignation
 * Manchester Rusholme
 * 7 October 1919
 * Robert Burdon Stoker
 * John Henry Thorpe
 * Death
 * Pontefract
 * 6 September 1919
 * Joseph Compton-Rickett
 * Walter Forrest
 * Death
 * - bgcolor=pink
 * Widnes
 * 30 August 1919
 * William Walker
 * Arthur Henderson
 * Elevation to the peerage
 * Dublin University
 * 28 July 1919
 * Arthur Warren Samuels
 * William Morgan Jellett
 * Appointed to the Irish High Court
 * - bgcolor=pink
 * Bothwell
 * 16 July 1919
 * David Macdonald
 * John Robertson
 * Death
 * Swansea East
 * 10 July 1919
 * Thomas Jeremiah Williams
 * David Matthews
 * Death
 * - bgcolor="#c0c0c0"
 * East Antrim
 * 27 May 1919
 * Robert McCalmont
 * George Boyle Hanna
 * nionist
 * Appointed Commander of the Irish Guards
 * - bgcolor=FFCC66
 * Aberdeenshire and Kincardineshire Central
 * 16 April 1919
 * Alexander Theodore Gordon
 * Murdoch McKenzie Wood
 * Death
 * - bgcolor=FFCC66
 * Kingston upon Hull Central
 * 29 March 1919
 * Mark Sykes
 * Joseph Kenworthy
 * Death
 * Oxford University
 * 19–24 March 1919
 * Rowland Prothero
 * Charles Oman
 * Elevation to the peerage
 * North Londonderry
 * 4 March 1919
 * Hugh Anderson
 * Hugh T. Barrie
 * Resignation
 * - bgcolor=FFCC66
 * Leyton West
 * 1 March 1919
 * Harry Wrightson
 * Alfred Newbould
 * Death
 * Liverpool West Derby
 * 26 February 1919
 * Sir F. E. Smith
 * William Reginald Hall
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * }
 * Auckland Geddes
 * Arthur Holbrook
 * Resignation
 * Camberwell North West
 * 31 March 1920
 * Thomas James McNamara
 * Thomas James McNamara
 * Appointed Minister of Labour
 * - bgcolor=pink
 * Dartford
 * 27 March 1920
 * James Rowlands
 * John Edmund Mills
 * Death
 * rowspan=2|Stockport
 * rowspan=2|27 March 1920
 * Spencer Leigh Hughes
 * Henry Fildes
 * Death
 * - bgcolor=lightblue
 * George Wardle
 * William Greenwood
 * Resignation
 * Argyll
 * 10 March 1920
 * William Sutherland
 * William Sutherland
 * Appointed as a Junior Lord of the Treasury
 * Horncastle
 * 25 February 1920
 * William Weigall
 * Stafford Vere Hotchkin
 * Appointed Governor of South Australia
 * Paisley
 * 12 February 1920
 * John Mills McCallum
 * H. H. Asquith
 * Death
 * - bgcolor="#c0c0c0"
 * The Wrekin
 * 7 February 1920
 * Charles Solomon Henry
 * Charles Frederick Palmer
 * Death
 * Ashton-under-Lyne
 * 31 January 1920
 * Albert Stanley
 * Walter de Frece
 * Elevation to the peerage
 * - bgcolor=pink
 * Spen Valley
 * 20 December 1919
 * Thomas Whittaker
 * Tom Myers
 * Death
 * Bromley
 * 17 December 1919
 * Henry Forster
 * Cuthbert James
 * Elevation to the peerage
 * St Albans
 * 10 December 1919
 * Hildred Carlile
 * Francis Fremantle
 * Resignation
 * Plymouth Sutton
 * 28 November 1919
 * Waldorf Astor
 * Nancy Astor
 * Succession to the peerage
 * Isle of Thanet
 * 15 November 1919
 * Norman Carlyle Craig
 * Esmond Harmsworth
 * Death
 * Croydon South
 * 14 November 1919
 * Ian Malcolm
 * Allan Smith
 * Resignation
 * Chester-le-Street
 * 13 November 1919
 * John Wilkinson Taylor
 * Jack Lawson
 * Resignation
 * Manchester Rusholme
 * 7 October 1919
 * Robert Burdon Stoker
 * John Henry Thorpe
 * Death
 * Pontefract
 * 6 September 1919
 * Joseph Compton-Rickett
 * Walter Forrest
 * Death
 * - bgcolor=pink
 * Widnes
 * 30 August 1919
 * William Walker
 * Arthur Henderson
 * Elevation to the peerage
 * Dublin University
 * 28 July 1919
 * Arthur Warren Samuels
 * William Morgan Jellett
 * Appointed to the Irish High Court
 * - bgcolor=pink
 * Bothwell
 * 16 July 1919
 * David Macdonald
 * John Robertson
 * Death
 * Swansea East
 * 10 July 1919
 * Thomas Jeremiah Williams
 * David Matthews
 * Death
 * - bgcolor="#c0c0c0"
 * East Antrim
 * 27 May 1919
 * Robert McCalmont
 * George Boyle Hanna
 * nionist
 * Appointed Commander of the Irish Guards
 * - bgcolor=FFCC66
 * Aberdeenshire and Kincardineshire Central
 * 16 April 1919
 * Alexander Theodore Gordon
 * Murdoch McKenzie Wood
 * Death
 * - bgcolor=FFCC66
 * Kingston upon Hull Central
 * 29 March 1919
 * Mark Sykes
 * Joseph Kenworthy
 * Death
 * Oxford University
 * 19–24 March 1919
 * Rowland Prothero
 * Charles Oman
 * Elevation to the peerage
 * North Londonderry
 * 4 March 1919
 * Hugh Anderson
 * Hugh T. Barrie
 * Resignation
 * - bgcolor=FFCC66
 * Leyton West
 * 1 March 1919
 * Harry Wrightson
 * Alfred Newbould
 * Death
 * Liverpool West Derby
 * 26 February 1919
 * Sir F. E. Smith
 * William Reginald Hall
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * }
 * Arthur Warren Samuels
 * William Morgan Jellett
 * Appointed to the Irish High Court
 * - bgcolor=pink
 * Bothwell
 * 16 July 1919
 * David Macdonald
 * John Robertson
 * Death
 * Swansea East
 * 10 July 1919
 * Thomas Jeremiah Williams
 * David Matthews
 * Death
 * - bgcolor="#c0c0c0"
 * East Antrim
 * 27 May 1919
 * Robert McCalmont
 * George Boyle Hanna
 * nionist
 * Appointed Commander of the Irish Guards
 * - bgcolor=FFCC66
 * Aberdeenshire and Kincardineshire Central
 * 16 April 1919
 * Alexander Theodore Gordon
 * Murdoch McKenzie Wood
 * Death
 * - bgcolor=FFCC66
 * Kingston upon Hull Central
 * 29 March 1919
 * Mark Sykes
 * Joseph Kenworthy
 * Death
 * Oxford University
 * 19–24 March 1919
 * Rowland Prothero
 * Charles Oman
 * Elevation to the peerage
 * North Londonderry
 * 4 March 1919
 * Hugh Anderson
 * Hugh T. Barrie
 * Resignation
 * - bgcolor=FFCC66
 * Leyton West
 * 1 March 1919
 * Harry Wrightson
 * Alfred Newbould
 * Death
 * Liverpool West Derby
 * 26 February 1919
 * Sir F. E. Smith
 * William Reginald Hall
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * }
 * 4 March 1919
 * Hugh Anderson
 * Hugh T. Barrie
 * Resignation
 * - bgcolor=FFCC66
 * Leyton West
 * 1 March 1919
 * Harry Wrightson
 * Alfred Newbould
 * Death
 * Liverpool West Derby
 * 26 February 1919
 * Sir F. E. Smith
 * William Reginald Hall
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * }
 * 26 February 1919
 * Sir F. E. Smith
 * William Reginald Hall
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * }
 * Hereditary Peerage on appointment as Lord High Chancellor of Great Britain
 * }