# 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

35th Parliament (1929–1931) :
| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause |
| Guildford | 25 August 1931 | Henry Buckingham | | Conservative | Charles Rhys | | Conservative | Death |
| Liverpool Wavertree | 23 June 1931 | John Tinné | | Conservative | Ronald Nall-Cain | | Conservative | Resignation |
| Manchester Ardwick | 22 June 1931 | Thomas Lowth | | Labour | Joseph Henderson | | Labour | Death |
| Gateshead | 8 June 1931 | James Melville | | Labour | Herbert Evans | | Labour | Death |
| Rutherglen | 21 May 1931 | William Wright | | Labour | David Hardie | | Labour | Death |
| Stroud | 21 May 1931 | Sir Frank Nelson | | Conservative | Walter Perkins | | Conservative | Resignation |
| Ogmore | 19 May 1931 | Vernon Hartshorn | | Labour | Edward Williams | | Labour | Death |
| Glasgow St Rollox | 7 May 1931 | James Stewart | | Labour | William Leonard | | Labour | Death |
| Scarborough and Whitby | 6 May 1931 | Sidney Herbert | | Conservative | Paul Latham | | Conservative | Resignation |
| Ashton-under-Lyne | 30 April 1931 | Albert Bellamy | | Labour | John Broadbent | | Conservative | Death |
| Woolwich East | 15 April 1931 | Henry Snell | | Labour | George Hicks | | Labour | Elevation to the peerage |
| Sunderland | 26 March 1931 | Alfred Smith | | Labour | Luke Thompson | | Conservative | Death |
| Pontypridd | 19 March 1931 | Thomas Isaac Mardy Jones | | Labour | David Lewis Davies | | Labour | Resignation |
| Westminster St George's | 19 March 1931 | Laming Worthington-Evans | | Conservative | Duff Cooper | | Conservative | Death |
| Salisbury | 11 March 1931 | Hugh Morrison | | Conservative | James Despencer-Robertson | | Conservative | Resignation |
| Fermanagh and Tyrone | 7 March 1931 | Thomas Harbison | | Nationalist | Cahir Healy | | Nationalist | Death |
| Fareham | 20 February 1931 | John Davidson | | Conservative | Thomas Inskip | | Conservative | Resignation |
| Islington East | 19 February 1931 | Ethel Bentham | | Labour | Leah Manning | | Labour | Death |
| Liverpool East Toxteth | 5 February 1931 | Henry Mond | | Conservative | Patrick Buchan-Hepburn | | Conservative | Succession to the peerage |
| Bristol East | 16 January 1931 | Walter Baker | | Labour | Stafford Cripps | | Labour | Death |
| Whitechapel and St George's | 3 December 1930 | Harry Gosling | | Labour | J. H. Hall | | Labour | Death |
| East Renfrewshire | 28 November 1930 | Alexander Munro MacRobert | | Conservative | Douglas Douglas-Hamilton | | Conservative | Death |
| Shipley | 6 November 1930 | William Mackinder | | Labour | James Lockwood | | Conservative | Death |
| Paddington South | 30 October 1930 | Douglas King | | Conservative | Ernest Taylor | | Empire Crusade | Death |
| Bromley | 2 September 1930 | Cuthbert James | | Conservative | Edward Campbell | | Conservative | Death |
| North Norfolk | 9 July 1930 | Noel Buxton | | Labour | Lucy Noel-Buxton | | Labour | Elevation to the peerage |
| Glasgow Shettleston | 26 June 1930 | John Wheatley | | Labour | John McGovern | | Labour | Death |
| Nottingham Central | 27 May 1930 | Albert Bennett | | Conservative | Terence O'Connor | | Conservative | Resignation |
| Fulham West | 6 May 1930 | Ernest Spero | | Labour | Cyril Cobb | | Conservative | Resignation |
| Sheffield Brightside | 6 February 1930 | Arthur Ponsonby | | Labour | Fred Marshall | | Labour | Elevated to the peerage |
| Liverpool Scotland | 14 December 1929 | T. P. O'Connor | | Irish Parliamentary | David Logan | | Labour | Death |
| Tamworth | 2 December 1929 | Edward Iliffe | | Conservative | Arthur Steel-Maitland | | Conservative | Resignation |
| Kilmarnock | 27 September 1929 | Robert Climie | | Labour | Craigie Aitchison | | Labour | Death |
| Twickenham | 8 August 1929 | William Joynson-Hicks | | Conservative | John Ferguson | | Conservative | Elevated to the peerage |
| Leeds South East | 1 August 1929 | Henry Slesser | | Labour | James Milner | | Labour | Resignation |
| Preston | 31 July 1929 | William Jowitt | | Liberal | William Jowitt | | Labour | Seeks re-election upon change of party allegiance |
| 1 2 3 An uncontested by-election. The Guildford by-election was initially contested but on 25 August the Liberal candidate withdrew, in light of the changed political situation due to the formation of the National Government the previous day. 1 2 3 4 Retained at the 1931 general election. ↑ Sunderland was a two member constituency. Both MPs were won by Labour in the 1929 general election and by the Conservatives in the 1931 general election. ↑ Taylor joined the Conservative Party in 1931, holding the seat at the 1931 general election. ↑ A rare case of a gain in an unopposed election. O'Connor had an ad hoc group of supporters in the constituency who helped his campaign at election times, and Logan had been extensively involved in the Irish nationalist movement in his youth. ↑ Preston was a two member constituency. Jowitt was appointed Attorney General of England and Wales in the Labour government and opted to seek re-election in his new party colours. In 1931 he became a National Labour MP but did not recontest Preston in the 1931 general election as he could not secure the withdrawal of Conservative candidates supporting the National Government who took both seats. 34th Parliament (1924–1929) |||||||||
| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause |
| North Lanarkshire | 21 March 1929 | Alexander Sprot | | Conservative | Jennie Lee | | Labour | Death |
| Holland with Boston | 21 March 1929 | Arthur Dean | | Conservative | James Blindell | | Liberal | Death |
| Bath | 21 March 1929 | Charles Foxcroft | | Conservative | Charles Baillie-Hamilton | | Conservative | Death |
| Eddisbury | 20 March 1929 | Harry Barnston | | Conservative | Richard John Russell | | Liberal | Death |
| Liverpool East Toxteth | 19 March 1929 | Albert Edward Jacob | | Conservative | Henry Mond | | Conservative | Death |
| Wansbeck | 13 February 1929 | George Warne | | Labour | George Shield | | Labour | Death |
| Bishop Auckland | 7 February 1929 | Ben Spoor | | Labour | Ruth Dalton | | Labour | Death |
| Battersea South | 7 February 1929 | Francis Curzon | | Conservative | William Bennett | | Labour | Succession to the peerage |
| Londonderry | 29 January 1929 | Malcolm Macnaghten | | UUP | Ronald Ross | | UUP | Appointment as High Court judge |
| Midlothian and Peeblesshire Northern | 29 January 1929 | George Hutchison | | Conservative | Andrew Clarke | | Labour | Death |
| Ashton-under-Lyne | 29 October 1928 | Cornelius Homan | | Conservative | Albert Bellamy | | Labour | Declared bankrupt |
| Tavistock | 11 October 1928 | Philip Kenyon-Slaney | | Conservative | Wallace Duffield Wright | | Conservative | Death |
| Cheltenham | 26 September 1928 | James Agg-Gardner | | Conservative | Walter Preston | | Conservative | Death |
| Aberdeen North | 16 August 1928 | Frank Herbert Rose | | Labour | William Wedgwood Benn | | Labour | Death |
| Sheffield Hallam | 16 July 1928 | Frederick Sykes | | Conservative | Louis Smith | | Conservative | Appointed Governor of Bombay |
| Halifax | 13 July 1928 | John Henry Whitley | | Speaker | Arthur Longbottom | | Labour | Resignation (retired as Speaker) |
| Epsom | 4 July 1928 | George Blades | | Conservative | Archibald Southby | | Conservative | Elevation to the peerage |
| Carmarthen | 28 June 1928 | Alfred Mond | | Liberal/Conservative | William Nathaniel Jones | | Liberal | Elevation to the Hereditary Peerage |
| Holborn | 28 June 1928 | James Remnant | | Conservative | Stuart Bevan | | Conservative | Elevation to the peerage |
| St Marylebone | 30 April 1928 | Sir Douglas Hogg | | Conservative | Rennell Rodd | | Conservative | Hereditary Peerage on appointment as Lord High Chancellor of Great Britain |
| Hanley | 23 April 1928 | Samuel Clowes | | Labour | Arthur Hollins | | Labour | Death |
| Linlithgowshire | 4 April 1928 | James Kidd | | Conservative | Manny Shinwell | | Labour | Death |
| Middlesbrough West | 7 March 1928 | Trevelyan Thomson | | Liberal | Frank Kingsley Griffith | | Liberal | Death |
| St Ives | 6 March 1928 | Anthony Hawke | | Conservative | Hilda Runciman | | Liberal | Appointment as a High Court Judge |
| Ilford | 23 February 1928 | Fredric Wise | | Conservative | George Hamilton | | Conservative | Death |
| Lancaster | 9 February 1928 | Gerald Strickland | | Conservative | Robert Parkinson Tomlinson | | Liberal | Elevation to the Hereditary Peerage |
| Bristol West | 2 February 1928 | George Gibbs | | Conservative | Cyril Culverwell | | Conservative | Elevation to the peerage |
| Faversham | 25 January 1928 | Granville Wheler | | Conservative | Adam Maitland | | Conservative | Death |
| Northampton | 9 January 1928 | Arthur Holland | | Conservative | Cecil L'Estrange Malone | | Labour | Death |
| Canterbury | 24 November 1927 | Ronald McNeill | | Conservative | William Wayland | | Conservative | Elevation to the peerage |
| Southend | 19 November 1927 | Rupert Guinness | | Conservative | Gwendolen Guinness | | Conservative | Succession to the peerage |
| Brixton | 27 June 1927 | Davison Dalziel | | Conservative | Nigel Colman | | Conservative | Elevation to the peerage |
| Westbury | 16 June 1927 | Walter William Shaw | | Conservative | Richard Long | | Conservative | Death |
| Bosworth | 31 May 1927 | Robert Gee | | Conservative | William Edge | | Liberal | Resignation |
| Combined Scottish Universities | 26–29 April 1927 | Henry Craik | | Conservative | John Buchan | | Conservative | Death |
| Southwark North | 28 March 1927 | Leslie Haden-Guest | | Labour | Edward Strauss | | Liberal | Sought re-election upon change of party allegiance |
| Leith | 23 March 1927 | William Wedgwood Benn | | Liberal | Ernest Brown | | Liberal | Resignation |
| Stourbridge | 23 February 1927 | Douglas Pielou | | Conservative | Wilfred Wellock | | Labour | Death |
| Smethwick | 21 December 1926 | John Davison | | Labour | Oswald Mosley | | Labour | Resignation |
| Chelmsford | 30 November 1926 | Henry Curtis-Bennett | | Conservative | Charles Howard-Bury | | Conservative | Resignation |
| Kingston-upon-Hull Central | 29 November 1926 | Joseph Kenworthy | | Liberal | Joseph Kenworthy | | Labour | Seeks re-election upon change of party allegiance |
| Howdenshire | 25 November 1926 | Stanley Jackson | | Conservative | William Carver | | Conservative | Resignation |
| North Cumberland | 17 September 1926 | Donald Howard | | Conservative | Fergus Graham | | Conservative | Succession to the peerage |
| Wallsend | 21 July 1926 | Patrick Hastings | | Labour | Margaret Bondfield | | Labour | Resignation |
| Hammersmith North | 20 May 1926 | Ellis Ashmead-Bartlett | | Conservative | James Patrick Gardner | | Labour | Resignation |
| Buckrose | 5 May 1926 | Guy Gaunt | | Conservative | Albert Braithwaite | | Conservative | Resignation |
| East Ham North | 29 April 1926 | Charles Williamson Crook | | Conservative | Susan Lawrence | | Labour | Death |
| Bothwell | 26 March 1926 | John Robertson | | Labour | Joseph Sullivan | | Labour | Death |
| Combined English Universities | 8–12 March 1926 | Herbert Albert Laurens Fisher | | Liberal | Alfred Hopkinson | | Conservative | Resignation |
| Darlington | 17 February 1926 | William Edwin Pease | | Conservative | Arthur Lewis Shepherd | | Labour | Death |
| Cambridge University | 13 February 1926 | John Rawlinson | | Conservative | John James Withers | | Conservative | Death |
| East Renfrewshire | 29 January 1926 | Alexander Munro MacRobert | | Conservative | Alexander Munro MacRobert | | Conservative | Appointed Solicitor General for Scotland |
| Dunbartonshire | 29 January 1926 | David Fleming | | Conservative | John Thom | | Conservative | Appointed to the Court of Session |
| Ripon | 5 December 1925 | Edward Wood | | Conservative | John Waller Hills | | Conservative | Resignation |
| Bury St Edmunds | 1 December 1925 | Walter Guinness | | Conservative | Walter Guinness | | Conservative | Appointed Minister of Agriculture and Fisheries |
| Galloway | 17 November 1925 | Arthur Henniker-Hughan | | Conservative | Sidney Streatfield | | Conservative | Death |
| Stockport | 17 September 1925 | William Greenwood | | Conservative | Arnold Townend | | Labour | Death |
| Forest of Dean | 14 July 1925 | James Wignall | | Labour | A. A. Purcell | | Labour | Death |
| Oldham | 24 June 1925 | Edward Grigg | | Liberal | William Wiggins | | Liberal | Resignation |
| Eastbourne | 17 June 1925 | George Lloyd | | Conservative | William Reginald Hall | | Conservative | Resignation |
| Ayr Burghs | 12 June 1925 | John Baird | | Conservative | Thomas Moore | | Conservative | Appointed Governor-General of Australia |
| Walsall | 27 February 1925 | William Preston | | Conservative | William Preston | | Conservative | Disqualification |
| Dundee | 22 December 1924 | E. D. Morel | | Labour | Thomas Johnston | | Labour | Death |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Gain retained at the 1929 general election. ↑ An uncontested election. 1 2 Gain not retained at the 1929 general election. ↑ Prior to his elevation to Speaker of the House of Commons, John Henry Whitley had been a Liberal MP. ↑ Alfred Mond was elected in the 1924 general election as a Liberal but moved to the Conservative Party in Parliament. The Liberals retook his seat in the by-election but lost it to Labour in the 1929 general election. ↑ Haden-Guest left the Labour Party and sought re-election as a Constitutionalist, but the seat was gained by the Liberals. In the 1929 general election the seat was regained by the Labour Party. ↑ The Combined English Universities was a two-member constituency. In the 1924 general election it elected one Conservative and one Liberal. The Conservatives gained the Liberal seat but in the 1929 general election the two seats were won by one Conservative and one Independent (Eleanor Rathbone). ↑ An uncontested election. ↑ Stockport was a two member constituency. In the 1924 general election it elected two Conservative MPs. One seat was lost to the Labour Party in the 1926 by-election. In the 1929 general election the Conservative and Labour Parties won one seat apiece. 33rd Parliament (1923–1924) |||||||||
| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause |
| Carmarthen | 14 August 1924 | Ellis Ellis-Griffith | | Liberal | Alfred Mond | | Liberal | Resignation |
| Holland with Boston | 31 July 1924 | William Royce | | Labour | Arthur Dean | | Conservative | Death |
| Lewes | 9 July 1924 | William Campion | | Conservative | Tufton Beamish | | Conservative | Appointment as Governor of Western Australia |
| Oxford | 5 June 1924 | Frank Gray | | Liberal | Robert Bourne | | Conservative | Election declared void |
| Glasgow Kelvingrove | 23 May 1924 | William Hutchison | | Conservative | Walter Elliot | | Conservative | Death |
| Liverpool West Toxteth | 22 May 1924 | Robert Houston | | Conservative | Joseph Gibbins | | Labour | Resignation |
| Westminster Abbey | 19 March 1924 | John Nicholson | | Conservative | Otho Nicholson | | Conservative | Death |
| Dover | 12 March 1924 | John Astor | | Conservative | John Astor | | Conservative | Voted before taking the Oath of Allegiance |
| Burnley | 28 February 1924 | David Irving | | Labour | Arthur Henderson | | Labour | Death |
| City of London | 1 February 1924 | Frederick Banbury | | Conservative | Vansittart Bowater | | Conservative | Elevation to the peerage |
| 1 2 3 Gain retained at the 1924 general election. ↑ An uncontested by-election. 32nd Parliament (1922–1923) |||||||||
| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause |
| Yeovil | 30 October 1923 | Aubrey Herbert | | Conservative | George Davies | | Conservative | Death |
| Rutland and Stamford | 30 October 1923 | Charles Harvey Dixon | | Conservative | Neville Smith-Carington | | Conservative | Death |
| Portsmouth South | 13 August 1923 | Leslie Orme Wilson | | Conservative | Herbert Cayzer | | Conservative | Resignation |
| Leeds Central | 26 July 1923 | Arthur Wellesley Willey | | Conservative | Charles Henry Wilson | | Conservative | Death |
| Tiverton | 21 June 1923 | Herbert Sparkes | | Conservative | Francis Dyke Acland | | Liberal | Death |
| Morpeth | 21 June 1923 | John Cairns | | Labour | Robert Smillie | | Labour | Death |
| Berwick-upon-Tweed | 31 May 1923 | Hilton Philipson | | National Liberal | Mabel Philipson | | Conservative | Void election (electoral fraud) |
| Ludlow | 19 April 1923 | Ivor Windsor-Clive | | Conservative | George Windsor-Clive | | Conservative | Succession to the peerage |
| Anglesey | 7 April 1923 | Owen Thomas | | Independent Labour | Robert Thomas | | Liberal | Death |
| Liverpool Edge Hill | 6 March 1923 | William Rutherford | | Conservative | Jack Hayes | | Labour | Resignation |
| Mitcham | 3 March 1923 | Thomas Worsfold | | Conservative | James Chuter Ede | | Labour | Resignation |
| Willesden East | 3 March 1923 | Harry Mallaby-Deeley | | Conservative | Harcourt Johnstone | | Liberal | Resignation |
| Darlington | 28 February 1923 | Herbert Pease | | Conservative | William Edwin Pease | | Conservative | Elevation to the peerage |
| Whitechapel and St George's | 8 February 1923 | Charles James Mathew | | Labour | Harry Gosling | | Labour | Death |
| Newcastle-upon-Tyne East | 17 January 1923 | Joseph Nicholas Bell | | Labour | Arthur Henderson | | Labour | Death |
| Portsmouth South | 13 December 1922 | Herbert Cayzer | | Conservative | Leslie Orme Wilson | | Conservative | Resignation |
| 1 2 3 4 5 Gain retained at the 1923 general election. ↑ Gain not retained at the 1923 general election. 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 | Party | Party | Winner | Party | Party | Cause |
| Newport (Monmouthshire) | 18 October 1922 | Lewis Haslam | | National Liberal | Reginald Clarry | | Conservative | Death |
| Hackney South | 18 August 1922 | Horatio Bottomley | | Independent | Clifford Erskine-Bolst | | Coalition Conservative | Expelled from the House (convicted of fraud) |
| Pontypridd | 25 July 1922 | Thomas Arthur Lewis | | National Liberal | Thomas Isaac Mardy Jones | | Labour | Appointed as a Junior Lord of the Treasury |
| North Down | 21 July 1922 | Henry Wilson | | UUP | John Morrow Simms | | UUP | Death (assassinated by IRA) |
| Gower | 20 July 1922 | John Williams | | Labour | David Grenfell | | Labour | Death |
| Nottingham East | 29 June 1922 | John David Rees | | Coalition Conservative | John Houfton | | Coalition Conservative | Death |
| Banbury | 22 June 1922 | Rhys Rhys-Williams | | National Liberal | Rhys Rhys-Williams | | National Liberal | Appointed Recorder of Cardiff |
| Moray and Nairn | 21 June 1922 | Archibald Williamson | | National Liberal | Thomas Maule Guthrie | | National Liberal | Elevation to the peerage |
| Newbury | 10 June 1922 | William Mount | | Coalition Conservative | Howard Clifton Brown | | Coalition Conservative | Resignation |
| North Londonderry | 4 June 1922 | Hugh T. Barrie | | UUP | Malcolm Macnaghten | | UUP | Death |
| City of London | 19 May 1922 | Arthur Balfour | | Coalition Conservative | Edward Grenfell | | Coalition Conservative | Elevation to the peerage |
| Clapham | 9 May 1922 | Arthur du Cros | | Coalition Conservative | John Leigh | | Coalition Conservative | Resignation |
| Leicester East | 30 March 1922 | Gordon Hewart | | National Liberal | George Banton | | Labour | Appointment as Lord Chief Justice of England and Wales |
| Chertsey | 24 March 1922 | Donald MacMaster | | Coalition Conservative | Philip Richardson | | Coalition Conservative | Death |
| Inverness | 16 March 1922 | Thomas Brash Morison | | National Liberal | Murdoch MacDonald | | National Liberal | Resignation |
| Cambridge | 16 March 1922 | Eric Geddes | | Coalition Conservative | George Newton | | Coalition Conservative | Resignation |
| Liverpool Exchange | 13 March 1922 | Leslie Scott | | Coalition Conservative | Leslie Scott | | Coalition Conservative | Appointed as Solicitor General |
| Wolverhampton West | 7 March 1922 | Alfred Bird | | Coalition Conservative | Robert Bird | | Coalition Conservative | Death |
| Bodmin | 24 February 1922 | Charles Hanson | | Coalition Conservative | Isaac Foot | | Liberal | Death |
| North Down | 21 February 1922 | Thomas Watters Brown | | UUP | Henry Wilson | | UUP | Appointed to the High Court of Northern Ireland |
| Camberwell North | 20 February 1922 | Henry Newton Knights | | Coalition Conservative | Charles Ammon | | Labour | Resignation (bankruptcy) |
| Manchester Clayton | 18 February 1922 | Edward Hopkinson | | Coalition Conservative | John Edward Sutton | | Labour | Death |
| West Down | 17 February 1922 | Thomas Browne Wallace | | UUP | Hugh Hayes | | UUP | Appointed Chief Clerk to the High Court of Northern Ireland |
| South Londonderry | 18 January 1922 | Robert Chichester | | UUP | William Hacket Pain | | UUP | Death |
| Tamworth | 17 January 1922 | Henry Wilson-Fox | | Coalition Conservative | Percy Newson | | Coalition Conservative | Death |
| Ludlow | 4 January 1922 | Beville Stanier | | Coalition Conservative | Ivor Windsor-Clive | | Coalition Conservative | Death |
| Southwark South East | 14 December 1921 | James Arthur Dawes | | National Liberal | Thomas Naylor | | Labour | Death |
| Hornsey | 10 November 1921 | Kennedy Jones | | Conservative | William Ward | | Conservative | Death |
| Westhoughton | 5 October 1921 | William Wilson | | Labour | Rhys Davies | | Labour | Death |
| Louth | 22 September 1921 | Thomas Wintringham | | Liberal | Margaret Wintringham | | Liberal | Death |
| Lewisham West | 13 September 1921 | Edward Coates | | Conservative | Philip Dawson | | Conservative | Death |
| South Londonderry | 29 August 1921 | Denis Henry | | UUP | Robert Chichester | | UUP | Appointed Lord Chief Justice of Northern Ireland |
| Westminster Abbey | 25 August 1921 | William Burdett-Coutts | | Conservative | John Sanctuary Nicholson | | Conservative | Death |
| Caerphilly | 24 August 1921 | Alfred Onions | | Labour | Morgan Jones | | Labour | Death |
| Hertford | 16 July 1921 | Noel Pemberton Billing | | Independent | Murray Sueter | | Anti-Waste League and Independent | Resignation (ill-health) |
| Heywood and Radcliffe | 8 June 1921 | Albert Illingworth | | National Liberal | Walter Halls | | Labour | Elevation to the peerage |
| Westminster St George's | 7 July 1921 | Walter Long | | Coalition Conservative | James Malcolm Monteith Erskine | | Anti-Waste League | Elevation to the peerage |
| West Down | 5 July 1921 | Daniel Martin Wilson | | UUP | Thomas Browne Wallace | | UUP | Appointed Recorder of Belfast |
| Mid Down | 2 July 1921 | James Craig | | UUP | Robert Sharman-Crawford | | UUP | Elected Prime Minister of Northern Ireland |
| Mid Armagh | 23 June 1921 | James Rolston Lonsdale | | UUP | Henry Bruce Armstrong | | UUP | Death |
| Belfast Duncairn | 23 June 1921 | Edward Carson | | UUP | Thomas Edward McConnell | | UUP | Appointed Lord of Appeal in Ordinary |
| North Down | 23 June 1921 | Thomas Watters Brown | | UUP | Thomas Watters Brown | | UUP | Appointed Solicitor-General for Ireland |
| Orkney and Shetland | 17 May 1921 | Cathcart Wason | | National Liberal | Malcolm Smith | | National Liberal | Death |
| Abingdon | 14 May 1921 | John Tyson Wigan | | Coalition Conservative | Arthur Loyd | | Coalition Conservative | Resignation |
| Penrith and Cockermouth | 13 May 1921 | James Lowther | | Coalition Conservative | Cecil Lowther | | Coalition Conservative | Resignation |
| Hastings | 4 May 1921 | Laurance Lyon | | Coalition Conservative | Eustace Percy | | Coalition Conservative | Resignation |
| Chichester | 23 April 1921 | Edmund Talbot | | Coalition Conservative | William Bird | | Coalition Conservative | Resignation |
| Bedford | 23 April 1921 | Frederick Kellaway | | National Liberal | Frederick Kellaway | | National Liberal | Appointed Postmaster General |
| Bewdley | 19 April 1921 | Stanley Baldwin | | Coalition Conservative | Stanley Baldwin | | Coalition Conservative | Appointed President of the Board of Trade |
| Eddisbury | 19 April 1921 | Harry Barnston | | Coalition Conservative | Harry Barnston | | Coalition Conservative | Appointed Comptroller of the Household |
| East Dorset | 16 April 1921 | Frederick Guest | | National Liberal | Frederick Guest | | National Liberal | Appointed Secretary of State for Air |
| Glasgow Pollok | 14 April 1921 | John Gilmour | | Coalition Conservative | John Gilmour | | Coalition Conservative | Appointed Junior Lord of the Treasury |
| Bristol West | 9 April 1921 | George Gibbs | | Coalition Conservative | George Gibbs | | Coalition Conservative | Appointed Treasurer of the Household |
| Taunton | 8 April 1921 | Dennis Boles | | Coalition Conservative | Arthur Griffith-Boscawen | | Coalition Conservative | Resignation |
| Birmingham West | 31 March 1921 | Austen Chamberlain | | Coalition Conservative | Austen Chamberlain | | Coalition Conservative | Appointed Lord Privy Seal |
| Penistone | 5 March 1921 | Sydney Arnold | | Liberal | William Gillis | | Labour | Resignation |
| Kirkcaldy Burghs | 4 March 1921 | Henry Dalziel | | National Liberal | Tom Kennedy | | Labour | Resignation |
| Birmingham Moseley | 4 March 1921 | Hallewell Rogers | | Coalition Conservative | Patrick Hannon | | Coalition Conservative | Resignation |
| Dudley | 3 March 1921 | Arthur Griffith-Boscawen | | Coalition Conservative | James Wilson | | Labour | Appointment as Minister of Agriculture |
| Woolwich East | 2 March 1921 | Will Crooks | | Labour | Robert Gee | | Coalition Conservative | Death |
| Cardiganshire | 18 February 1921 | Matthew Vaughan-Davies | | National Liberal | Ernest Evans | | National Liberal | Elevated to the peerage |
| Dover | 12 January 1921 | Vere Ponsonby | | Coalition Conservative | Thomas Andrew Polson | | Independent | Succession to the Peerage |
| Hereford | 11 January 1921 | Charles Pulley | | Coalition Conservative | Samuel Roberts | | Coalition Conservative | Resignation |
| Abertillery | 21 December 1920 | William Brace | | Labour | George Barker | | Labour | Resignation |
| Rhondda West | 21 December 1920 | William Abraham | | Labour | William John | | Labour | Resignation |
| Middleton and Prestwich | 22 November 1920 | William Adkins | | National Liberal | William Adkins | | National Liberal | Appointed Recorder of Birmingham |
| The Wrekin | 20 November 1920 | Charles Frederick Palmer | | Independent | C. V. F. Townshend | | Independent | Death |
| Hemel Hempstead | 9 November 1920 | Gustavus Talbot | | Coalition Conservative | J. C. C. Davidson | | Coalition Conservative | Death |
| Ilford | 25 September 1920 | William Peter Griggs | | Coalition Conservative | Fredric Wise | | Coalition Conservative | Death |
| Woodbridge | 28 July 1920 | Robert Francis Peel | | Coalition Conservative | Arthur Churchman | | Coalition Conservative | Resignation |
| South Norfolk | 27 July 1920 | William Cozens-Hardy | | National Liberal | George Edwards | | Labour | Succession to the peerage |
| Ebbw Vale | 26 July 1920 | Thomas Richards | | Labour | Evan Davies | | Labour | Resignation |
| Nelson and Colne | 17 June 1920 | Albert Smith | | Labour | Robinson Graham | | Labour | Resignation |
| Louth | 3 June 1920 | Henry Langton Brackenbury | | Coalition Conservative | Thomas Wintringham | | Liberal | Death |
| Sunderland | 24 April 1920 | Hamar Greenwood | | National Liberal | Hamar Greenwood | | National Liberal | Appointed Chief Secretary for Ireland |
| Edinburgh North | 9 April 1920 | James Avon Clyde | | Coalition Conservative | Patrick Ford | | Coalition Conservative | Resignation |
| Edinburgh South | 9 April 1920 | Charles Murray | | Coalition Conservative | Charles Murray | | Coalition Conservative | Appointed Solicitor General for Scotland |
| Northampton | 1 April 1920 | Charles McCurdy | | National Liberal | Charles McCurdy | | National Liberal | Appointed Minister of Food Control |
| Basingstoke | 31 March 1920 | Auckland Geddes | | Coalition Conservative | Arthur Holbrook | | Coalition Conservative | Resignation |
| Camberwell North West | 31 March 1920 | Thomas James McNamara | | National Liberal | Thomas James McNamara | | National Liberal | Appointed Minister of Labour |
| Dartford | 27 March 1920 | James Rowlands | | National Liberal | John Edmund Mills | | Labour | Death |
| Stockport | 27 March 1920 | Spencer Leigh Hughes | | National Liberal | Henry Fildes | | National Liberal | Death |
| Stockport | 27 March 1920 | George Wardle | | Coalition Labour | William Greenwood | | Coalition Conservative | Resignation |
| Argyll | 10 March 1920 | William Sutherland | | National Liberal | William Sutherland | | National Liberal | Appointed as a Junior Lord of the Treasury |
| Horncastle | 25 February 1920 | William Weigall | | Coalition Conservative | Stafford Vere Hotchkin | | Coalition Conservative | Appointed Governor of South Australia |
| Paisley | 12 February 1920 | John Mills McCallum | | Liberal | H. H. Asquith | | Liberal | Death |
| The Wrekin | 7 February 1920 | Charles Solomon Henry | | National Liberal | Charles Frederick Palmer | | Independent | Death |
| Ashton-under-Lyne | 31 January 1920 | Albert Stanley | | Coalition Conservative | Walter de Frece | | Coalition Conservative | Elevation to the peerage |
| Spen Valley | 20 December 1919 | Thomas Whittaker | | National Liberal | Tom Myers | | Labour | Death |
| Bromley | 17 December 1919 | Henry Forster | | Coalition Conservative | Cuthbert James | | Coalition Conservative | Elevation to the peerage |
| St Albans | 10 December 1919 | Hildred Carlile | | Coalition Conservative | Francis Fremantle | | Coalition Conservative | Resignation |
| Plymouth Sutton | 28 November 1919 | Waldorf Astor | | Coalition Conservative | Nancy Astor | | Coalition Conservative | Succession to the peerage |
| Isle of Thanet | 15 November 1919 | Norman Carlyle Craig | | Conservative | Esmond Harmsworth | | Conservative | Death |
| Croydon South | 14 November 1919 | Ian Malcolm | | Coalition Conservative | Allan Smith | | Coalition Conservative | Resignation |
| Chester-le-Street | 13 November 1919 | John Wilkinson Taylor | | Labour | Jack Lawson | | Labour | Resignation |
| Manchester Rusholme | 7 October 1919 | Robert Burdon Stoker | | Coalition Conservative | John Henry Thorpe | | Coalition Conservative | Death |
| Pontefract | 6 September 1919 | Joseph Compton-Rickett | | National Liberal | Walter Forrest | | National Liberal | Death |
| Widnes | 30 August 1919 | William Walker | | Coalition Conservative | Arthur Henderson | | Labour | Elevation to the peerage |
| Dublin University | 28 July 1919 | Arthur Warren Samuels | | Irish Unionist | William Morgan Jellett | | Irish Unionist | Appointed to the Irish High Court |
| Bothwell | 16 July 1919 | David Macdonald | | Coalition Conservative | John Robertson | | Labour | Death |
| Swansea East | 10 July 1919 | Thomas Jeremiah Williams | | National Liberal | David Matthews | | National Liberal | Death |
| East Antrim | 27 May 1919 | Robert McCalmont | | Irish Unionist | George Boyle Hanna | | Ind. Unionistnionist | Appointed Commander of the Irish Guards |
| Aberdeenshire and Kincardineshire Central | 16 April 1919 | Alexander Theodore Gordon | | Coalition Conservative | Murdoch McKenzie Wood | | Liberal | Death |
| Kingston upon Hull Central | 29 March 1919 | Mark Sykes | | Coalition Conservative | Joseph Kenworthy | | Liberal | Death |
| Oxford University | 19–24 March 1919 | Rowland Prothero | | Coalition Conservative | Charles Oman | | Coalition Conservative | Elevation to the peerage |
| North Londonderry | 4 March 1919 | Hugh Anderson | | Irish Unionist | Hugh T. Barrie | | Irish Unionist | Resignation |
| Leyton West | 1 March 1919 | Harry Wrightson | | Coalition Conservative | Alfred Newbould | | Liberal | Death |
| Liverpool West Derby | 26 February 1919 | Sir F. E. Smith | | Coalition Conservative | William Reginald Hall | | Coalition Conservative | Hereditary Peerage on appointment as Lord High Chancellor of Great Britain |
* 1 2 3 4 5 6 7 Gain retained at the 1922 general election.
* ↑ Horatio Bottomley was expelled from the Commons following his imprisonment for fraud. The by-election was won by Clifford Erskine-Bolst as a Conservative candidate supporting the Coalition, who retained the seat in the 1922 general election for the party post Coalition.
* 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 An uncontested by-election.
* 1 2 3 4 5 6 7 Gain not retained at the 1922 general election.
* 1 2 3 The seat was regained at the 1922 general election by the National Liberals, as the Coalition Liberals were restyled following the end of the Coalition.
* 1 2 Thomas Wintringham died later in the Parliament and Louth was retained for the Liberals by his wife Margaret in both the second by-election and the 1922 general election.
* ↑ Erskine was the nominee of the Anti-Waste League. In the 1922 general election he was also supported by the St. George's, Hannover Square, Independent Conservative Association who were in dispute with the official Conservative Association in the constituency. During the 1922-1923 Parliament Erskine came to sit as an official Conservative and retained the seat as such in subsequent elections.
* ↑ At the time of his election Polson was supported by Horatio Bottomley who formed the Independent Parliamentary Group in Parliament. Shortly after election he joined the newly formed Anti-Waste League. He unsuccessfully defended his seat in the 1922 general election as an Independent Conservative, losing to an official Conservative candidate.
* 1 2 The Wrekin experienced two by-elections in 1920. Both Charles Frederick Palmer and C. V. F. Townshend were supported by Horatio Bottomley and once in Parliament joined his Independent Parliamentary Group. The seat was won by the Coalition Liberals in the 1918 general election and by the Conservatives in the 1922 general election.
* ↑ George Edwards gained South Norfolk from the Liberals, but lost to the Conservatives in the 1922 general election.
* ↑ John Edmund Mills won Dartford from the Coalition Liberals, but lost to George William Symonds Jarrett, running as a Constitutionalist in the 1922 general election.
* ↑ Spen Valley was taken from the Coalition Liberals by Labour due to the intervention of an anti-Coalition official Liberal. In the 1922 general election the anti-Coalition Liberal gained the seat.
* ↑ Due to the establishment of the Parliament of Northern Ireland, the number of constituencies for Northern Ireland was substantially reduced from the 1922 general election. East Antrim was absorbed into the larger two-member Antrim constituency, which at the 1922 election was won by two official Ulster Unionists.