# List of United Kingdom by-elections (1832–1847)

This is a list of parliamentary by-elections in the United Kingdom held between 1832 and 1847, with the names of the previous incumbent and the victor in the by-election and their respective parties. Where seats changed political party at the election, the result is highlighted: light blue for a Conservative (or Tory before 1835) gain, orange for a Whig gain and green for Irish Repeal gain.

## Resignations

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

## By-elections

14th Parliament (1841–1847) :
| By-election | Date | Former incumbent | Party | Party | Winner | Party | Party | Cause |
| County Cork | 2 July 1847 | Daniel O'Connell | | Irish Repeal | Maurice Power | | Irish Repeal | Death |
| Derby | 16 June 1847 | Viscount Duncannon | | Whig | Frederick Leveson-Gower | | Whig | Succession to a peerage |
| County Galway | 17 May 1847 | Thomas Barnwall Martin | | Whig | Thomas Burke | | Irish Repeal | Death |
| East Somerset | 10 April 1847 | William Gore-Langton | | Whig | William Pinney | | Whig | Death |
| Bedfordshire | 30 March 1847 | William Thornton Astell | | Conservative | Lord Charles Russell | | Whig | Death |
| Lewes | 17 March 1847 | Sir Howard Elphinstone | | Whig | Robert Perfect | | Whig | Resignation |
| Canterbury | 15 March 1847 | James Bradshaw | | Conservative | Lord Albert Conyngham | | Whig | Death |
| Galway Borough | 17 February 1847 | Sir Valentine Blake | | Irish Repeal | James Henry Monahan | | Whig | Death |
| Middlesex | 3 February 1847 | George Byng | | Whig | Lord Robert Grosvenor | | Whig | Death |
| West Sussex | 2 February 1847 | Charles Wyndham | | Conservative | Richard Prime | | Conservative | Resignation |
| Chester | 30 January 1847 | Lord Robert Grosvenor | | Whig | Earl Grosvenor | | Whig | Resignation to contest Middlesex |
| Salisbury | 25 January 1847 | Ambrose Hussey | | Conservative | William James Chaplin | | Whig | Resignation |
| North Lincolnshire | 12 January 1847 | Lord Worsley | | Whig | Sir Montague Cholmeley | | Whig | Succession to a peerage |
| East Worcestershire | 11 January 1847 | John Barneby | | Conservative | George Rushout | | Conservative | Resignation |
| Renfrewshire | 9 December 1846 | Patrick Maxwell Stewart | | Whig | William Mure | | Conservative | Death |
| Clonmel | 12 September 1846 | David Richard Pigot | | Whig | Cecil John Lawless | | Irish Repeal | Resignation (Lord Chief Baron of the Exchequer in Ireland) |
| Derby | 4 September 1846 | Edward Strutt | | Whig | Edward Strutt | | Whig | Resignation pending appointment as President of the Railway Commission |
| St. Albans | 11 August 1846 | The Earl of Listowel | | Whig | Benjamin Bond Cabbell | | Conservative | Lord-in-waiting |
| Chester | 8 August 1846 | Lord Robert Grosvenor | | Whig | Lord Robert Grosvenor | | Whig | Treasurer of the Household |
| Dundalk | 31 July 1846 | Thomas Nicholas Redington | | Whig | Daniel O'Connell Jnr | | Irish Repeal | Resignation (Under-Secretary for Ireland) |
| County Kilkenny | 29 July 1846 | Pierce Butler | | Irish Repeal | Richard Smithwicke | | Irish Repeal | Death |
| Sutherland | 28 July 1846 | David Dundas | | Whig | David Dundas | | Whig | Solicitor General for England and Wales |
| St. Ives | 21 July 1846 | William Tyringham Praed | | Conservative | Lord William Powlett | | Conservative | Death |
| Roscommon | 21 July 1846 | The O'Conor Don | | Irish Repeal | The O'Conor Don | | Whig | Junior Lord of the Treasury |
| South Lancashire | 21 July 1846 | Lord Francis Egerton | | Conservative | William Brown | | Whig | Elevation to the peerage |
| West Riding of Yorkshire | 18 July 1846 | Viscount Morpeth | | Whig | Viscount Morpeth | | Whig | First Commissioner of Woods and Forests |
| South Staffordshire | 17 July 1846 | George Anson | | Whig | George Anson | | Whig | Clerk of the Ordnance |
| Kirkcudbrightshire | 17 July 1846 | Thomas Maitland | | Whig | Thomas Maitland | | Whig | Solicitor General for Scotland |
| Liskeard | 15 July 1846 | Charles Buller | | Whig | Charles Buller | | Whig | Judge Advocate General |
| Lichfield | 15 July 1846 | Lord Alfred Paget | | Whig | Lord Alfred Paget | | Whig | Chief Equerry and Clerk Marshal |
| Edinburgh | 15 July 1846 | Thomas Babington Macaulay | | Whig | Thomas Babington Macaulay | | Whig | Paymaster General |
| Richmond | 13 July 1846 | Henry Rich | | Whig | Henry Rich | | Whig | Junior Lord of the Treasury |
| Manchester | 13 July 1846 | Thomas Milner Gibson | | Whig | Thomas Milner Gibson | | Whig | Vice-President of the Board of Trade |
| Greenwich | 13 July 1846 | James Whitley Deans Dundas | | Whig | James Whitley Deans Dundas | | Whig | Second Naval Lord |
| Edinburgh | 13 July 1846 | William Gibson Craig | | Whig | William Gibson Craig | | Whig | Junior Lord of the Treasury |
| Tower Hamlets | 11 July 1846 | Charles Richard Fox | | Whig | Charles Richard Fox | | Whig | Surveyor-General of the Ordnance |
| Plymouth | 11 July 1846 | Viscount Ebrington | | Whig | Viscount Ebrington | | Whig | Junior Lord of the Treasury |
| Perth | 11 July 1846 | Fox Maule | | Whig | Fox Maule | | Whig | Secretary at War |
| Hertford | 11 July 1846 | William Cowper | | Whig | William Cowper | | Whig | Civil Lord of the Admiralty |
| Gloucester | 11 July 1846 | Maurice Berkeley | | Whig | Maurice Berkeley | | Whig | Third Naval Lord |
| Evesham | 11 July 1846 | Lord Marcus Hill | | Whig | Lord Marcus Hill | | Whig | Comptroller of the Household |
| Chester | 11 July 1846 | John Jervis | | Whig | John Jervis | | Whig | Solicitor General for England and Wales |
| Tiverton | 10 July 1846 | The Viscount Palmerston | | Whig | The Viscount Palmerston | | Whig | Foreign Secretary |
| Taunton | 10 July 1846 | Henry Labouchere | | Whig | Henry Labouchere | | Whig | Resignation pending appointment as Chief Secretary for Ireland |
| Dungarvan | 10 July 1846 | Richard Lalor Sheil | | Whig | Richard Lalor Sheil | | Whig | Master of the Mint |
| Devonport | 10 July 1846 | Sir George Grey | | Whig | Sir George Grey | | Whig | Home Secretary |
| Leith Burghs | 9 July 1846 | Andrew Rutherfurd | | Whig | Andrew Rutherfurd | | Whig | Lord Advocate |
| Halifax | 9 July 1846 | Charles Wood | | Whig | Charles Wood | | Whig | Chancellor of the Exchequer |
| Worcester | 8 July 1846 | Thomas Wilde | | Whig | Denis Le Marchant | | Whig | Attorney General for England and Wales |
| Nottingham | 8 July 1846 | John Cam Hobhouse | | Whig | John Cam Hobhouse | | Whig | President of the Board of Control |
| City of London | 8 July 1846 | Lord John Russell | | Whig | Lord John Russell | | Whig | Prime Minister and First Lord of the Treasury |
| County Carlow | 1 July 1846 | Thomas Bunbury | | Conservative | William McClintock-Bunbury | | Conservative | Death |
| Falkirk Burghs | 2 May 1846 | William Baird | | Conservative | Earl of Lincoln | | Conservative | Resignation |
| Malton | 15 April 1846 | John Walbanke-Childers | | Whig | Viscount Milton | | Whig | Resignation |
| Richmond | 8 April 1846 | William Ridley-Colborne | | Whig | Henry Rich | | Whig | Death |
| Windsor | 14 March 1846 | Ralph Neville | | Conservative | Ralph Neville | | Conservative | Junior Lord of the Treasury |
| Stafford | 13 March 1846 | Swynfen Carnegie | | Conservative | Swynfen Carnegie | | Conservative | Junior Lord of the Treasury |
| Bridport | 7 March 1846 | Alexander Baillie-Cochrane | | Conservative | Alexander Baillie-Cochrane | | Conservative | Seeks re-election as a supporter of free trade |
| Bridport | 7 March 1846 | Alexander Baillie-Cochrane | | Conservative | John Romilly | | Whig | By-Election result reversed on petition |
| North Nottinghamshire | 6 March 1846 | Henry Gally Knight | | Conservative | Lord Henry Bentinck | | Conservative | Death |
| Mayo | 2 March 1846 | Mark Blake | | Irish Repeal | Joseph Myles McDonnell | | Irish Repeal | Resignation |
| South Nottinghamshire | 27 February 1846 | Earl of Lincoln | | Conservative | Thomas Thoroton-Hildyard | | Conservative | Chief Secretary for Ireland |
| East Gloucestershire | 27 February 1846 | Francis Charteris | | Conservative | Marquess of Worcester | | Conservative | Resignation |
| South Northamptonshire | 24 February 1846 | William Ralph Cartwright | | Conservative | Richard Henry Howard Vyse | | Conservative | Resignation |
| Westminster | 19 February 1846 | Henry John Rous | | Conservative | George de Lacy Evans | | Whig | Fourth Naval Lord |
| East Suffolk | 19 February 1846 | John Henniker-Major | | Conservative | Edward Gooch | | Conservative | Resignation |
| Dorset | 19 February 1846 | Lord Ashley | | Conservative | Henry Ker Seymer | | Conservative | Resignation |
| Dorset | 19 February 1846 | Henry Sturt | | Conservative | John Floyer | | Conservative | Resignation |
| Rutlandshire | 14 February 1846 | William Dawnay | | Conservative | George Finch | | Conservative | Resignation |
| Selkirkshire | 12 February 1846 | Alexander Pringle | | Conservative | Allen Eliott-Lockhart | | Conservative | Resignation (Clerk of Sasines) |
| Buckingham | 11 February 1846 | Thomas Fremantle | | Conservative | Marquess of Chandos | | Conservative | Resignation |
| Chichester | 10 February 1846 | Lord Arthur Lennox | | Conservative | Lord Henry Lennox | | Conservative | Resignation |
| Buteshire | 7 February 1846 | James Archibald Stuart-Wortley | | Conservative | James Archibald Stuart-Wortley | | Conservative | Judge Advocate General |
| Cashel | 5 February 1846 | Joseph Stock | | Whig | Timothy O'Brien | | Irish Repeal | Resignation |
| West Riding of Yorkshire | 4 February 1846 | John Stuart Wortley | | Conservative | Viscount Morpeth | | Whig | Succession to a peerage |
| East Sussex | 3 February 1846 | George Darby | | Conservative | Charles Frewen | | Conservative | Resignation |
| Ripon | 2 February 1846 | Thomas Berry Cusack Smith | | Conservative | Edwin Lascelles | | Conservative | Resignation (Master of the Rolls in Ireland) |
| Lichfield | 31 January 1846 | Lord Leveson | | Whig | Edward Lloyd-Mostyn | | Whig | Succession to a peerage |
| Cork City | 31 January 1846 | Francis Murphy | | Whig | Alexander McCarthy | | Irish Repeal | Resignation |
| Midhurst | 30 January 1846 | Horace Beauchamp Seymour | | Conservative | Spencer Horatio Walpole | | Conservative | Resignation to contest Antrim |
| Newark | 29 January 1846 | William Ewart Gladstone | | Conservative | John Stuart | | Conservative | Secretary of State for War and the Colonies |
| Buckingham | 20 January 1846 | Sir John Chetwode | | Conservative | John Hall | | Conservative | Death |
| Hertfordshire | 8 January 1846 | Viscount Grimston | | Conservative | Thomas Plumer Halsey | | Conservative | Succession to a peerage |
| Antrim | 22 December 1845 | John Irving | | Conservative | Horace Beauchamp Seymour | | Conservative | Death |
| Woodstock | 18 December 1845 | John Henry Loftus | | Conservative | Lord Alfred Spencer-Churchill | | Conservative | Succession to a peerage |
| Windsor | 8 November 1845 | John Ramsbottom | | Whig | George Alexander Reid | | Conservative | Death |
| South Warwickshire | 5 November 1845 | Sir John Mordaunt | | Conservative | Lord Brooke | | Conservative | Death |
| Wigan | 16 October 1845 | Peter Greenall | | Conservative | James Alexander Lindsay | | Conservative | Death |
| Southwark | 12 September 1845 | Benjamin Wood | | Whig | Sir William Molesworth | | Whig | Death |
| Linlithgowshire | 22 August 1845 | Charles Hope | | Conservative | William Baillie | | Conservative | Resignation (Lieutenant Governor of the Isle of Man) |
| Kirkcudbrightshire | 20 August 1845 | Alexander Murray | | Conservative | Thomas Maitland | | Conservative | Death |
| Belfast | 20 August 1845 | James Emerson Tennent | | Whig | Lord John Chichester | | Whig | Resignation |
| Sunderland | 15 August 1845 | Viscount Howick | | Whig | George Hudson | | Conservative | Succession to a peerage |
| Cirencester | 14 August 1845 | William Cripps | | Conservative | William Cripps | | Conservative | Junior Lord of the Treasury |
| Warwick | 13 August 1845 | Charles Eurwicke Douglas | | Conservative | Charles Eurwicke Douglas | | Conservative | Commissioner of Greenwich Hospital |
| Chichester | 12 August 1845 | Lord Arthur Lennox | | Conservative | Lord Arthur Lennox | | Conservative | Clerk of the Ordnance |
| Hereford | 31 July 1845 | Edward Bolton Clive | | Whig | Sir Robert Price | | Whig | Death |
| Cambridge | 16 July 1845 | Fitzroy Kelly | | Conservative | Fitzroy Kelly | | Conservative | Solicitor General for England and Wales |
| Abingdon | 9 July 1845 | Frederic Thesiger | | Conservative | Frederic Thesiger | | Conservative | Attorney General for England and Wales |
| West Suffolk | 7 July 1845 | Robert Rushbrooke | | Conservative | Philip Bennet | | Conservative | Death |
| Exeter | 7 July 1845 | William Webb Follett | | Conservative | Sir John Duckworth | | Conservative | Death |
| Dartmouth | 3 July 1845 | Joseph Somes | | Conservative | George Moffatt | | Whig | Death |
| Midlothian | 25 June 1845 | William Ramsay Ramsay | | Conservative | Sir John Hope | | Conservative | Resignation |
| Down | 3 June 1845 | Earl of Hillsborough | | Conservative | Lord Edwin Hill | | Conservative | Succession to a peerage |
| Denbighshire | 7 May 1845 | Sir Watkin Williams-Wynn | | Conservative | Sir Watkin Williams-Wynn | | Conservative | Steward of Bromfield and Yale |
| Peeblesshire | 5 May 1845 | William Forbes Mackenzie | | Conservative | William Forbes Mackenzie | | Conservative | Junior Lord of the Treasury |
| Woodstock | 1 May 1845 | Marquess of Blandford | | Conservative | John Henry Loftus | | Conservative | Resignation |
| Leominster | 26 April 1845 | Henry Barkly | | Whig | Charles Greenaway | | Conservative | Resignation |
| West Kent | 25 April 1845 | Viscount Marsham | | Conservative | Thomas Austen | | Conservative | Succession to a peerage |
| Greenock | 18 April 1845 | Robert Wallace | | Whig | Walter Baine | | Whig | Resignation |
| Shaftesbury | 5 March 1845 | Lord Howard of Effingham | | Whig | Richard Brinsley Sheridan | | Whig | Succession to a peerage |
| East Kent | 3 March 1845 | Sir Edward Knatchbull | | Conservative | William Deedes | | Conservative | Resignation |
| Thetford | 24 February 1845 | Bingham Baring | | Conservative | Bingham Baring | | Conservative | Paymaster General |
| Tipperary | 21 February 1845 | Robert Otway-Cave | | Whig | Richard Albert Fitzgerald | | Irish Repeal | Resignation |
| Buckinghamshire | 21 February 1845 | Charles Robert Scott Murray | | Conservative | Christopher Tower | | Conservative | Resignation |
| East Cornwall | 20 February 1845 | Lord Eliot | | Conservative | William Pole-Carew | | Conservative | Succession to a peerage |
| Lewes | 17 February 1845 | Henry Fitzroy | | Conservative | Henry Fitzroy | | Conservative | Civil Lord of the Admiralty |
| South Wiltshire | 15 February 1845 | Sidney Herbert | | Conservative | Sidney Herbert | | Conservative | Secretary at War |
| Stamford | 10 February 1845 | Sir George Clerk | | Conservative | Sir George Clerk | | Conservative | Vice-President of the Board of Trade and Master of the Mint |
| Buckingham | 10 February 1845 | Thomas Fremantle | | Conservative | Thomas Fremantle | | Conservative | Chief Secretary for Ireland |
| Dartmouth | 27 December 1844 | Sir John Seale | | Whig | Joseph Somes | | Conservative | Death |
| North Lancashire | 20 September 1844 | Lord Stanley | | Conservative | John Talbot Clifton | | Conservative | Resignation and elevation to the House of Lords through a Writ of acceleration |
| Dudley | 8 August 1844 | Thomas Hawkes | | Conservative | John Benbow | | Conservative | Resignation |
| Cirencester | 2 August 1844 | Thomas Chester-Master | | Conservative | Viscount Villiers | | Conservative | Resignation |
| Birmingham | 15 July 1844 | Joshua Scholefield | | Whig | Richard Spooner | | Conservative | Death |
| Limerick City | 9 July 1844 | David Roche | | Irish Repeal | James Kelly | | Irish Repeal | Resignation |
| Enniskillen | 18 June 1844 | Arthur Henry Cole | | Conservative | Henry Arthur Cole | | Conservative | Resignation |
| Kilmarnock Burghs | 29 May 1844 | Alexander Johnston | | Whig | Edward Pleydell-Bouverie | | Whig | Death |
| Chichester | 27 May 1844 | Lord Arthur Lennox | | Conservative | Lord Arthur Lennox | | Conservative | Junior Lord of the Treasury |
| Buckingham | 25 May 1844 | Sir Thomas Francis Fremantle | | Conservative | Sir Thomas Francis Fremantle | | Conservative | Secretary at War |
| South Lancashire | 24 May 1844 | Richard Bootle-Wilbraham | | Conservative | William Entwisle | | Conservative | Death |
| Launceston | 20 May 1844 | Henry Hardinge | | Conservative | William Bowles | | Conservative | Resignation (Governor-General of India) |
| Abingdon | 11 May 1844 | Thomas Duffield | | Conservative | Frederic Thesiger | | Conservative | Resignation |
| Horsham | 1 May 1844 | Robert Scarlett | | Conservative | Robert Henry Hurst | | Whig | Succession to a peerage |
| Woodstock | 22 April 1844 | Frederic Thesiger | | Conservative | Marquess of Blandford | | Conservative | Solicitor General for England and Wales |
| Huntingdon | 22 April 1844 | Frederick Pollock | | Conservative | Thomas Baring | | Conservative | Resignation (Chief Baron of the Exchequer) |
| Exeter | 20 April 1844 | William Webb Follett | | Conservative | William Webb Follett | | Conservative | Attorney General for England and Wales |
| Hastings | 30 March 1844 | Joseph Planta | | Conservative | Musgrave Brisco | | Conservative | Resignation |
| Christchurch | 28 March 1844 | George Henry Rose | | Conservative | Edward Harris | | Conservative | Resignation |
| County Londonderry | 13 March 1844 | Robert Bateson | | Conservative | Thomas Bateson | | Conservative | Death |
| North Wiltshire | 12 February 1844 | Francis Burdett | | Conservative | Thomas Sotheron | | Conservative | Death |
| Tipperary | 10 February 1844 | Valentine Maher | | Whig | Nicholas Maher | | Irish Repeal | Death |
| Devizes | 7 February 1844 | Thomas Sotheron | | Conservative | William Heald Ludlow Bruges | | Conservative | Resignation to contest North Wiltshire |
| County Kilkenny | 1 December 1843 | George Bryan | | Irish Repeal | Pierce Somerset Butler | | Whig | Death |
| Salisbury | 24 November 1843 | Wadham Wyndham | | Conservative | John Henry Campbell | | Conservative | Death |
| Kendal | 9 November 1843 | George William Wood | | Whig | Henry Warburton | | Whig | Death |
| City of London | 20 October 1843 | Sir Matthew Wood | | Whig | James Pattison | | Whig | Death |
| Argyllshire | 8 September 1843 | Alexander Campbell Cameron | | Conservative | Duncan McNeill | | Conservative | Resignation |
| Ayrshire | 3 August 1843 | Viscount Kelburn | | Conservative | Alexander Oswald | | Conservative | Succession to a peerage |
| Durham City | 26 July 1843 | The Viscount Dungannon | | Conservative | John Bright | | Whig | Void By-Election |
| Salisbury | 4 May 1843 | William Bird Brodie | | Whig | Ambrose Hussey | | Conservative | Resignation |
| East Suffolk | 18 April 1843 | Charles Broke Vere | | Conservative | The Lord Rendlesham | | Conservative | Death |
| Nottingham | 5 April 1843 | John Walter | | Conservative | Thomas Gisborne | | Whig | Void By-Election |
| Durham City | 5 April 1843 | Robert FitzRoy | | Conservative | The Viscount Dungannon | | Conservative | Resignation (Governor of New Zealand) |
| Athlone | 4 April 1843 | Daniel Farrell | | Whig | John Collett | | Whig | Void Election |
| Cambridge | 21 March 1843 | Sir Alexander Grant | | Conservative | Fitzroy Kelly | | Conservative | Resignation |
| Ripon | 18 March 1843 | Thomas Pemberton Leigh | | Conservative | Thomas Cusack-Smith | | Conservative | Resignation |
| Tavistock | 16 March 1843 | John Rundle | | Whig | John Salusbury-Trelawny | | Whig | Resignation |
| North Warwickshire | 10 March 1843 | Sir John Eardley-Wilmot | | Conservative | Charles Newdigate Newdegate | | Conservative | Resignation (Lieutenant-Governor of Van Diemen's Land) |
| Ashburton | 8 March 1843 | William Jardine | | Whig | James Matheson | | Whig | Death |
| Coleraine | 18 February 1843 | Edward Litton | | Conservative | John Boyd | | Conservative | Resignation (Master in Chancery in Ireland) |
| Monaghan | 17 February 1843 | Henry Westenra | | Whig | Charles Powell Leslie III | | Conservative | Succession to a peerage |
| Cavan | 17 February 1843 | Henry John Clements | | Conservative | James Pierce Maxwell | | Conservative | Death |
| Dublin University | 10 February 1843 | Joseph Devonsher Jackson | | Conservative | George Alexander Hamilton | | Conservative | Resignation (Puisne Justice of the Common Pleas in Ireland) |
| Bodmin | 9 February 1843 | Charles Vivian | | Whig | Samuel Thomas Spry | | Conservative | Succession to a peerage |
| North Shropshire | 16 January 1843 | Sir Rowland Hill | | Conservative | Viscount Clive | | Conservative | Succession to a peerage |
| Carmarthenshire | 27 December 1842 | John Jones | | Conservative | David Arthur Saunders Davies | | Conservative | Death |
| Buteshire | 1 December 1842 | Sir William Rae | | Conservative | James Archibald Stuart-Wortley | | Conservative | Death |
| South Hampshire | 23 August 1842 | John Willis Fleming | | Conservative | Lord Charles Wellesley | | Conservative | Resignation |
| Belfast | 19 August 1842 | James Emerson Tennent | | Conservative | James Emerson Tennent | | Conservative | Void Election |
| Belfast | 19 August 1842 | William Gillilan Johnson | | Conservative | David Robert Ross | | Whig | Void Election |
| Ipswich | 17 August 1842 | The Earl of Desart | | Conservative | John Neilson Gladstone | | Conservative | Void By-Election |
| Ipswich | 17 August 1842 | Thomas Gladstone | | Conservative | Sackville Lane-Fox | | Conservative | Void By-Election |
| Southampton | 9 August 1842 | Lord Bruce | | Conservative | Humphrey St John Mildmay | | Conservative | Void Election |
| Southampton | 9 August 1842 | Charles Cecil Martyn | | Conservative | George William Hope | | Conservative | Void Election |
| Nottingham | 4 August 1842 | Sir George Larpent | | Whig | John Walter | | Conservative | Resignation in exchange for withdrawal of election petition |
| Buckinghamshire | 15 July 1842 | Sir William Young | | Conservative | William Edward Fitzmaurice | | Conservative | Death |
| Newcastle-under-Lyme | 14 June 1842 | John Quincey Harris | | Whig | John Quincey Harris | | Whig | Void Election |
| Newcastle-under-Lyme | 14 June 1842 | John Quincey Harris | | Whig | John Campbell Colquhoun | | Conservative | By-Election result reversed on petition |
| Meath | 10 June 1842 | Daniel O'Connell | | Irish Repeal | Matthew Corbally | | Whig | Chose to sit for County Cork |
| Ipswich | 3 June 1842 | Rigby Wason | | Whig | The Earl of Desart | | Conservative | Void Election |
| Ipswich | 3 June 1842 | George Rennie | | Whig | Thomas Gladstone | | Conservative | Void Election |
| County Londonderry | 26 May 1842 | Sir Robert Bateson | | Conservative | Robert Bateson | | Conservative | Resignation |
| Brighton | 5 May 1842 | Isaac Newton Wigney | | Whig | Lord Alfred Hervey | | Conservative | Resignation |
| Montrose Burghs | 16 April 1842 | Patrick Chalmers | | Whig | Joseph Hume | | Whig | Resignation |
| South Shropshire | 3 March 1842 | Earl of Darlington | | Conservative | Viscount Newport | | Conservative | Succession to a peerage |
| Clackmannanshire and Kinross-shire | 18 February 1842 | George Abercromby | | Whig | Sir William Morison | | Whig | Resignation |
| West Cornwall | 16 February 1842 | Lord Boscawen-Rose | | Conservative | Charles Lemon | | Whig | Succession to a peerage |
| Bandon | 14 February 1842 | Joseph Devonsher Jackson | | Conservative | Viscount Bernard | | Conservative | Solicitor-General for Ireland |
| Taunton | 11 February 1842 | Edward Thomas Bainbridge | | Whig | Sir Thomas Colebrooke | | Whig | Resignation |
| Dublin University | 11 February 1842 | Thomas Langlois Lefroy | | Conservative | Joseph Devonsher Jackson | | Conservative | Resignation (Baron of the Exchequer in Ireland) |
| King's Lynn | 10 February 1842 | Stratford Canning | | Conservative | Viscount Jocelyn | | Conservative | Resignation |
| Liverpool | 8 February 1842 | Cresswell Cresswell | | Conservative | Howard Douglas | | Conservative | Resignation (Puisne Justice of the Common Pleas) |
| Leominster | 8 February 1842 | James Wigram | | Conservative | George Arkwright | | Conservative | Resignation (Vice-Chancellor) |
| Dublin City | 29 January 1842 | John Beattie West | | Conservative | William Henry Gregory | | Conservative | Death |
| Linlithgowshire | 20 October 1841 | Charles Hope | | Conservative | Charles Hope | | Conservative | Commissioner of Greenwich Hospital |
| Wilton | 6 October 1841 | Viscount FitzHarris | | Conservative | Viscount Somerton | | Conservative | Succession to a peerage |
| Hereford | 5 October 1841 | Henry William Hobhouse | | Whig | Robert Pulsford | | Whig | Resignation |
| East Retford | 2 October 1841 | Arthur Duncombe | | Conservative | Arthur Duncombe | | Conservative | Groom in Waiting in Ordinary |
| Cavan | 30 September 1841 | John Young | | Conservative | John Young | | Conservative | Junior Lord of the Treasury |
| County Sligo | 28 September 1841 | Alexander Perceval | | Conservative | John Ffolliott | | Conservative | Junior Lord of the Treasury |
| Ripon | 27 September 1841 | Edward Sugden | | Conservative | George Cockburn | | Conservative | Resignation (Lord Chancellor of Ireland) |
| Portarlington | 27 September 1841 | George Dawson-Damer | | Conservative | George Dawson-Damer | | Conservative | Comptroller of the Household |
| Monmouthshire | 24 September 1841 | Lord Granville Somerset | | Conservative | Lord Granville Somerset | | Conservative | Chancellor of the Duchy of Lancaster |
| Tyrone | 23 September 1841 | Henry Thomas Lowry-Corry | | Conservative | Henry Thomas Lowry-Corry | | Conservative | Civil Lord of the Admiralty |
| Buteshire | 23 September 1841 | William Rae | | Conservative | William Rae | | Conservative | Lord Advocate |
| Westmorland | 22 September 1841 | Viscount Lowther | | Conservative | William Thompson | | Conservative | Elevation to the House of Lords through a Writ of acceleration and appointment as Postmaster General |
| East Cornwall | 22 September 1841 | Lord Eliot | | Conservative | Lord Eliot | | Conservative | Chief Secretary for Ireland |
| North Riding of Yorkshire | 21 September 1841 | William Duncombe | | Conservative | Octavius Duncombe | | Conservative | Succession to a peerage |
| Selkirkshire | 21 September 1841 | Alexander Pringle | | Conservative | Alexander Pringle | | Conservative | Junior Lord of the Treasury |
| North Lancashire | 21 September 1841 | Lord Stanley | | Conservative | Lord Stanley | | Conservative | Secretary of State for War and the Colonies |
| Aberdeenshire | 21 September 1841 | William Gordon | | Conservative | William Gordon | | Conservative | Fourth Naval Lord |
| South Nottinghamshire | 20 September 1841 | Earl of Lincoln | | Conservative | Earl of Lincoln | | Conservative | First Commissioner of Woods and Forests |
| Lisburn | 20 September 1841 | Henry Meynell | | Conservative | Henry Meynell | | Conservative | Parliamentary Groom in Waiting |
| East Kent | 20 September 1841 | Sir Edward Knatchbull | | Conservative | Sir Edward Knatchbull | | Conservative | Paymaster General |
| Sunderland | 17 September 1841 | William Thompson | | Conservative | Viscount Howick | | Whig | Resignation in order to contest Westmorland |
| Cardiff Boroughs | 17 September 1841 | John Iltyd Nicholl | | Conservative | John Iltyd Nicholl | | Conservative | Judge Advocate General |
| Bradford | 16 September 1841 | William Cunliffe Lister | | Whig | William Busfield | | Whig | Death |
| Lichfield | 15 September 1841 | George Anson | | Whig | Lord Leveson | | Whig | Resignation |
| Launceston | 15 September 1841 | Henry Hardinge | | Conservative | Henry Hardinge | | Conservative | Secretary at War |
| Cambridge University | 15 September 1841 | Henry Goulburn | | Conservative | Henry Goulburn | | Conservative | Chancellor of the Exchequer |
| Bridport | 15 September 1841 | Rufane Shaw Donkin | | Whig | Alexander Baillie-Cochrane | | Conservative | Resignation in exchange for withdrawal of election petition |
| Wenlock | 14 September 1841 | James Milnes Gaskell | | Conservative | James Milnes Gaskell | | Conservative | Junior Lord of the Treasury |
| Newark | 14 September 1841 | William Ewart Gladstone | | Conservative | William Ewart Gladstone | | Conservative | Vice-President of the Board of Trade and Master of the Mint |
| Marlborough | 14 September 1841 | Henry Bingham Baring | | Conservative | Henry Bingham Baring | | Conservative | Junior Lord of the Treasury |
| Marlborough | 14 September 1841 | Lord Ernest Bruce | | Conservative | Lord Ernest Bruce | | Conservative | Vice-Chamberlain of the Household |
| Huntingdon | 14 September 1841 | Jonathan Peel | | Conservative | Jonathan Peel | | Conservative | Surveyor-General of the Ordnance |
| Huntingdon | 14 September 1841 | Frederick Pollock | | Conservative | Frederick Pollock | | Conservative | Attorney General for England and Wales |
| Chippenham | 14 September 1841 | Henry George Boldero | | Conservative | Henry George Boldero | | Conservative | Clerk of the Ordnance |
| Bury St. Edmunds | 14 September 1841 | Earl of Jermyn | | Conservative | Earl of Jermyn | | Conservative | Treasurer of the Household |
| Tamworth | 13 September 1841 | Robert Peel | | Conservative | Robert Peel | | Conservative | Prime Minister and First Lord of the Treasury |
| Exeter | 13 September 1841 | William Webb Follett | | Conservative | William Webb Follett | | Conservative | Solicitor General for England and Wales |
| Dorchester | 13 September 1841 | Sir James Graham | | Conservative | Sir James Graham | | Conservative | Home Secretary |
| 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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 An uncontested by-election. 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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 Seat vacated on appointment to the office noted. ↑ Gladstone did not stand for re-election as he had lost the support of his borough's patron. Gladstone did not stand again until the 1847 general election where he was successful at regaining a seat. ↑ MP appointed Serjeant-At-Arms of the House of Lords before writ moved. 13th Parliament (1837–1841) ||||||||||
| By-election | Date | Former incumbent | Party | Party | Winner | Party | Party | Cause |
| Sandwich | 11 May 1841 | Rufane Shaw Donkin | | Whig | Hugh Hamilton Lindsay | | Conservative | Death |
| Nottingham | 26 April 1841 | Ronald Craufurd Ferguson | | Whig | John Walter | | Conservative | Death |
| Antrim | 14 April 1841 | John Bruce Richard O'Neill | | Conservative | Nathaniel Alexander | | Conservative | Succession to an Irish peerage |
| King's County | 24 February 1841 | Nicholas Fitzsimon | | Whig | Andrew Armstrong | | Whig | Resignation |
| Richmond | 16 February 1841 | Alexander Speirs | | Whig | George Wentworth-FitzWilliam | | Whig | Resignation |
| St. Albans | 9 February 1841 | Edward Grimston | | Conservative | The Earl of Listowel | | Whig | Resignation |
| Monmouthshire | 9 February 1841 | William Addams Williams | | Whig | Charles Octavius Swinnerton Morgan | | Conservative | Resignation |
| East Surrey | 8 February 1841 | Richard Alsager | | Conservative | Edmund Antrobus | | Conservative | Death |
| Reigate | 3 February 1841 | Viscount Eastnor | | Conservative | Viscount Eastnor | | Conservative | Succession to a peerage |
| Canterbury | 3 February 1841 | Lord Albert Conyngham | | Whig | George Smythe | | Conservative | Resignation |
| Walsall | 2 February 1841 | Francis Finch | | Whig | John Neilson Gladstone | | Conservative | Resignation |
| Kirkcaldy Burghs | 27 January 1841 | Robert Ferguson | | Whig | Robert Ferguson | | Whig | Death |
| Mayo | 16 December 1840 | William John Brabazon | | Whig | Mark Blake | | Whig | Death |
| County Carlow | 5 December 1840 | Nicholas Aylward Vigors | | Whig | Henry Bruen | | Conservative | Death |
| County Waterford | 24 August 1840 | John Power | | Whig | Robert Carew | | Whig | Resignation |
| Clonmel | 21 August 1840 | David Richard Pigot | | Whig | David Richard Pigot | | Whig | Attorney-General for Ireland |
| Cavan | 12 August 1840 | Somerset Maxwell | | Conservative | Henry John Clements | | Conservative | Resignation |
| West Surrey | 31 July 1840 | George Perceval | | Conservative | John Trotter | | Conservative | Succession to a peerage |
| Louth | 31 July 1840 | Henry Chester | | Whig | Thomas Fortescue | | Whig | Resignation |
| East Cumberland | 20 July 1840 | Francis Aglionby | | Whig | Charles Howard | | Whig | Death |
| Radnorshire | 10 June 1840 | Walter Wilkins | | Whig | Sir John Walsh | | Conservative | Death |
| Sudbury | 5 June 1840 | Sir John Walsh | | Conservative | George Tomline | | Conservative | Resignation to contest Radnorshire |
| Cockermouth | 1 June 1840 | Edward Horsman | | Whig | Edward Horsman | | Whig | Junior Lord of the Treasury |
| Ludlow | 23 May 1840 | Thomas Alcock | | Whig | Beriah Botfield | | Conservative | Void By-Election |
| Cambridge | 23 May 1840 | John Manners-Sutton | | Conservative | Sir Alexander Grant | | Conservative | Void By-Election |
| Armagh City | 22 May 1840 | William Curry | | Whig | John Dawson Rawdon | | Whig | Resignation (Master in Chancery in Ireland) |
| Fermanagh | 30 April 1840 | Viscount Cole | | Conservative | Sir Arthur Brooke | | Conservative | Succession to a peerage |
| Elginshire and Nairnshire | 25 April 1840 | Francis Ogilvy-Grant | | Conservative | Charles Lennox Cumming Bruce | | Conservative | Resignation |
| Totnes | 21 April 1840 | Charles Barry Baldwin | | Conservative | Charles Barry Baldwin | | Conservative | Previous By-Election voided due to a Double Return |
| Totnes | 21 April 1840 | William Blount | | Whig | Charles Barry Baldwin | | Conservative | Previous By-Election voided due to a Double Return |
| Sutherland | 8 April 1840 | William Howard | | Conservative | David Dundas | | Whig | Resignation |
| Inverness-shire | 31 March 1840 | Francis William Grant | | Conservative | Henry James Baillie | | Conservative | Death |
| Woodstock | 20 March 1840 | Marquess of Blandford | | Conservative | Frederic Thesiger | | Conservative | Succession to a peerage |
| Helston | 12 March 1840 | Viscount Cantelupe | | Conservative | John Basset | | Conservative | Resignation to contest Lewes |
| Perthshire | 9 March 1840 | Viscount Stormont | | Conservative | Henry Home-Drummond | | Conservative | Succession to a peerage |
| Lewes | 9 March 1840 | Charles Richard Blunt | | Whig | Viscount Cantelupe | | Conservative | Death |
| Inverness Burghs | 4 March 1840 | Roderick Macleod | | Whig | James Morrison | | Whig | Resignation |
| Morpeth | 22 February 1840 | Lord Leveson | | Whig | Edward George Granville Howard | | Whig | Resignation |
| Meath | 4 February 1840 | Morgan O'Connell | | Whig | Matthew Corbally | | Whig | Resignation (First Assistant-Registrar of Deeds for Ireland) |
| Denbighshire | 30 January 1840 | Sir Watkin Williams-Wynn | | Conservative | Hugh Cholmondeley | | Conservative | Death |
| Rutland | 28 January 1840 | William Noel | | Conservative | Charles Noel | | Whig | Resignation |
| Newark-on-Trent | 25 January 1840 | Thomas Wilde | | Whig | Thomas Wilde | | Whig | Solicitor General for England and Wales |
| Birmingham | 25 January 1840 | Thomas Attwood | | Whig | George Frederick Muntz | | Whig | Resignation |
| Southwark | 24 January 1840 | Daniel Whittle Harvey | | Whig | Benjamin Wood | | Whig | Resignation (Commissioner of the City of London Police) |
| Devonport | 24 January 1840 | Edward Codrington | | Whig | Henry Tufnell | | Whig | Resignation |
| Beverley | 24 January 1840 | George Lane-Fox | | Conservative | Sackville Lane-Fox | | Conservative | Resignation |
| Penryn and Falmouth | 23 January 1840 | Robert Rolfe | | Whig | Edward John Hutchins | | Whig | Resignation (Baron of the Exchequer) |
| Edinburgh | 23 January 1840 | Thomas Babington Macaulay | | Whig | Thomas Babington Macaulay | | Whig | Secretary at War |
| Tipperary | 16 September 1839 | Richard Lalor Sheil | | Whig | Richard Lalor Sheil | | Whig | Vice-President of the Board of Trade |
| Manchester | 7 September 1839 | Charles Poulett Thomson | | Whig | Robert Hyde Greg | | Whig | Resignation (Governor General of Canada) |
| Waterford City | 6 September 1839 | Thomas Wyse | | Whig | Thomas Wyse | | Whig | Junior Lord of the Treasury |
| Cambridge | 6 September 1839 | Thomas Spring Rice | | Whig | John Manners-Sutton | | Conservative | Resignation and elevation to the peerage |
| Portsmouth | 30 August 1839 | Francis Thornhill Baring | | Whig | Francis Thornhill Baring | | Whig | Chancellor of the Exchequer |
| Perth | 19 August 1839 | Arthur Kinnaird | | Whig | David Greig | | Whig | Resignation |
| Aylesbury | 31 July 1839 | Winthrop Mackworth Praed | | Conservative | Charles Baillie-Hamilton | | Conservative | Death |
| Totnes | 26 July 1839 | Jasper Parrott | | Conservative | Charles Barry Baldwin | | Conservative | Resignation (Two MPs elected due to a Double Return) |
| Totnes | 26 July 1839 | Jasper Parrott | | Conservative | William Blount | | Whig | Resignation (Two MPs elected due to a Double Return) |
| Ipswich | 15 July 1839 | Thomas Milner Gibson | | Conservative | Thomas John Cochrane | | Conservative | Seeks re-election upon change of affiliation |
| Glasgow | 24 June 1839 | Lord William Bentinck | | Whig | James Oswald | | Whig | Resignation |
| Ludlow | 6 June 1839 | Viscount Clive | | Conservative | Thomas Alcock | | Whig | Succession to a peerage |
| Edinburgh | 4 June 1839 | James Abercromby | | Whig | Thomas Babington Macaulay | | Whig | Elevation to the peerage |
| Hertford | 20 May 1839 | William Cowper | | Whig | William Cowper | | Whig | Commissioner of Greenwich Hospital |
| Tyrone | 6 May 1839 | Viscount Alexander | | Conservative | Lord Claud Hamilton | | Conservative | Succession to an Irish peerage |
| Ayrshire | 1 May 1839 | John Dunlop | | Whig | Viscount Kelburn | | Conservative | Death |
| Leith Burghs | 29 April 1839 | John Murray | | Whig | Andrew Rutherfurd | | Whig | Resignation (Judge of the Court of Session) |
| Leicester | 22 March 1839 | Samuel Duckworth | | Whig | Wynne Ellis | | Whig | Resignation (Master in Chancery) |
| North Devon | 18 March 1839 | Viscount Ebrington | | Whig | Lewis William Buck | | Conservative | Elevation to the House of Lords through a Writ of acceleration |
| Richmond | 12 March 1839 | Lord Dundas | | Whig | Robert Lawrence Dundas | | Whig | Succession to a peerage |
| Wigan | 9 March 1839 | Richard Potter | | Whig | William Ewart | | Whig | Resignation |
| Leitrim | 6 March 1839 | Viscount Clements | | Whig | Viscount Clements | | Whig | Death |
| Southwark | 27 February 1839 | Daniel Whittle Harvey | | Whig | Daniel Whittle Harvey | | Whig | Registrar of the Metropolitan Public Carriages |
| Carlow Borough | 27 February 1839 | William Henry Maule | | Whig | Francis Bruen | | Conservative | Resignation (Baron of the Court of the Exchequer) |
| Carlow Borough | 27 February 1839 | Francis Bruen | | Conservative | Thomas Gisborne | | Whig | By-Election result reversed on petition |
| Devonport | 20 February 1839 | Sir George Grey | | Whig | Sir George Grey | | Whig | Judge Advocate General |
| Clonmel | 18 February 1839 | Nicholas Ball | | Whig | David Richard Pigot | | Whig | Resignation (Judge of the Court of Common Pleas in Ireland) |
| Cavan | 18 February 1839 | Henry Maxwell | | Conservative | Somerset Maxwell | | Conservative | Succession to an Irish peerage |
| Buckinghamshire | 18 February 1839 | Marquess of Chandos | | Conservative | Caledon Du Pré | | Conservative | Succession to a peerage |
| Sandwich | 12 February 1839 | James Rivett-Carnac | | Whig | Rufane Shaw Donkin | | Whig | Resignation (Governor of Bombay) |
| Tower Hamlets | 11 February 1839 | Stephen Lushington | | Whig | Stephen Lushington | | Whig | Judge of the High Court of Admiralty |
| Kirkcudbrightshire | 31 December 1838 | Robert Cutlar Fergusson | | Whig | Alexander Murray | | Whig | Death |
| Wycombe | 23 October 1838 | Robert Smith | | Whig | George Robert Smith | | Whig | Succession to a peerage |
| Great Yarmouth | 23 August 1838 | William Wilshere | | Whig | William Wilshere | | Whig | Resignation in exchange for withdrawal of election petition |
| Clonmel | 16 July 1838 | Nicholas Ball | | Whig | Nicholas Ball | | Whig | Attorney-General for Ireland |
| Cashel | 14 July 1838 | Stephen Woulfe | | Whig | Joseph Stock | | Whig | Resignation (Chief Baron of the Exchequer in Ireland) |
| Maidstone | 15 June 1838 | John Minet Fector | | Conservative | John Minet Fector | | Conservative | Void By-election |
| Linlithgowshire | 14 June 1838 | James Hope-Wallace | | Conservative | Charles Hope | | Conservative | Resignation |
| Inverness-shire | 12 June 1838 | Alexander William Chisholm | | Conservative | Francis William Grant | | Conservative | Resignation |
| Dungannon | 9 June 1838 | Viscount Northland | | Conservative | Thomas Knox | | Conservative | Resignation |
| St. Ives | 24 May 1838 | James Halse | | Conservative | William Tyringham Praed | | Conservative | Death |
| Gloucester | 21 May 1838 | Henry Thomas Hope | | Conservative | Henry Thomas Hope | | Conservative | Seeks re-election after dismissal of an election petition |
| Woodstock | 11 May 1838 | Sir Henry Peyton | | Conservative | Marquess of Blandford | | Conservative | Resignation in exchange for withdrawal of election petition |
| West Suffolk | 7 May 1838 | Robert Hart Logan | | Conservative | Harry Spencer Waddington | | Conservative | Death |
| Stamford | 1 May 1838 | Thomas Chaplin | | Conservative | Sir George Clerk | | Conservative | Resignation |
| Haddingtonshire | 14 April 1838 | Lord Ramsay | | Conservative | Sir Thomas Buchan-Hepburn | | Conservative | Succession to a peerage |
| Maidstone | 28 March 1838 | Wyndham Lewis | | Conservative | John Minet Fector | | Conservative | Death |
| Sudbury | 27 March 1838 | Edward Barnes | | Conservative | Sir John Walsh | | Conservative | Death |
| Devizes | 26 March 1838 | James Whitley Deans Dundas | | Whig | James Whitley Deans Dundas | | Whig | Clerk of the Ordnance |
| Devizes | 26 March 1838 | James Whitley Deans Dundas | | Whig | George Heneage Walker Heneage | | Conservative | By-Election result reversed on petition |
| Rutlandshire | 13 March 1838 | Sir Gerard Noel | | Conservative | William Noel | | Conservative | Death |
| West Kent | 5 March 1838 | Sir William Geary | | Conservative | Sir Edmund Filmer | | Conservative | Resignation |
| Marylebone | 3 March 1838 | Samuel Whalley | | Whig | The Lord Teignmouth | | Conservative | Void Election |
| Tipperary | 27 February 1838 | Richard Lalor Sheil | | Conservative | Richard Lalor Sheil | | Conservative | Commissioner of Greenwich Hospital |
| Portsmouth | 26 February 1838 | John Bonham-Carter | | Whig | George Thomas Staunton | | Whig | Death |
| Pembroke Boroughs | 20 February 1838 | Sir Hugh Owen Owen | | Conservative | Sir James Graham | | Conservative | Resignation |
| Bridgnorth | 20 February 1838 | Henry Hanbury-Tracy | | Whig | Sir Robert Pigot | | Conservative | Resignation in exchange for withdrawal of election petition |
| Elgin Burghs | 13 February 1838 | Andrew Leith Hay | | Whig | Fox Maule | | Whig | Resignation (Governor of Bermuda) |
| Galway Borough | 12 February 1838 | Andrew Henry Lynch | | Whig | Andrew Henry Lynch | | Whig | Master in Chancery |
| Sudbury | 12 December 1837 | Sir James Hamilton | | Conservative | Joseph Bailey | | Conservative | Resignation |
| Midhurst | 12 December 1837 | William Stephen Poyntz | | Whig | Frederick Spencer | | Whig | Resignation |
| 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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 An uncontested by-election. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Seat vacated on appointment to the office noted. ↑ Both Whigs and Conservatives made a pre-election agreement that if one party won both seats than one would resign. 12th Parliament (1835–1837) ||||||||||
| By-election | Date | Former incumbent | Party | Party | Winner | Party | Party | Cause |
| Glasgow | 27 May 1837 | James Oswald | | Whig | John Dennistoun | | Whig | Resignation |
| Hythe | 16 May 1837 | Stewart Marjoribanks | | Whig | Viscount Melgund | | Whig | Resignation |
| Bridgwater | 16 May 1837 | John Temple Leader | | Whig | Henry Broadwood | | Conservative | Resignation in order to contest Westminster |
| Westminster | 12 May 1837 | Francis Burdett | | Whig | Francis Burdett | | Conservative | Seeks re-election upon changing parties |
| Huddersfield | 8 May 1837 | John Blackburne | | Whig | Edward Ellice | | Whig | Death |
| Lewes | 21 April 1837 | Thomas Read Kemp | | Whig | Henry Fitzroy | | Conservative | Death |
| Rochdale | 19 April 1837 | John Entwistle | | Conservative | John Fenton | | Whig | Death |
| Ross and Cromarty | 18 April 1837 | James Alexander Stewart-Mackenzie | | Whig | Thomas Mackenzie | | Conservative | Resignation (Governor of Ceylon) |
| Warwick | 28 March 1837 | Charles Canning | | Conservative | William Collins | | Whig | Succession to a peerage |
| Anglesey | 23 February 1837 | Sir Richard Williams-Bulkeley | | Whig | William Owen Stanley | | Whig | Resignation |
| Stafford | 21 February 1837 | Sir Francis Holyoake-Goodricke | | Conservative | Robert Farrand | | Conservative | Resignation to contest South Staffordshire |
| Buckinghamshire | 20 February 1837 | James Backwell Praed | | Conservative | George Simon Harcourt | | Conservative | Death |
| County Carlow | 18 February 1837 | Thomas Kavanagh | | Conservative | Nicholas Aylward Vigors | | Whig | Death |
| Dungarvan | 16 February 1837 | Michael O'Loghlen | | Whig | John Power | | Whig | Resignation (Baron of the Exchequer in Ireland) |
| Cashel | 10 February 1837 | Stephen Woulfe | | Whig | Stephen Woulfe | | Whig | Solicitor-General for Ireland |
| Morpeth | 8 February 1837 | Edward George Granville Howard | | Whig | Lord Leveson | | Whig | Resignation |
| Evesham | 4 February 1837 | Sir Charles Cockerell | | Whig | George Rushout | | Conservative | Death |
| Renfrewshire | 30 January 1837 | Sir Michael Shaw-Stewart | | Whig | George Houstoun | | Conservative | Death |
| Malton | 27 January 1837 | John Charles Ramsden | | Whig | Viscount Milton | | Whig | Death |
| Longford | 30 December 1836 | Viscount Forbes | | Conservative | Luke White | | Whig | Death |
| Longford | 30 December 1836 | Luke White | | Whig | Charles Fox | | Conservative | By-Election result reversed on petition |
| Calne | 28 September 1836 | Earl of Kerry | | Whig | John Fox-Strangways | | Whig | Death |
| East Cumberland | 2 September 1836 | William Blamire | | Whig | William James | | Whig | Resignation (Chief Tithe Commissioner) |
| Down | 30 August 1836 | Lord Arthur Hill | | Conservative | Earl of Hillsborough | | Whig | Succession to a peerage |
| Warwick | 23 August 1836 | Charles John Greville | | Conservative | Charles Canning | | Conservative | Resignation |
| Sheffield | 22 August 1836 | John Parker | | Whig | John Parker | | Whig | Junior Lord of the Treasury |
| Newcastle-upon-Tyne | 27 July 1836 | Sir Matthew White Ridley | | Whig | John Hodgson | | Conservative | Death |
| South Warwickshire | 1 July 1836 | Edward Ralph Charles Sheldon | | Whig | Evelyn Shirley | | Conservative | Death |
| Merionethshire | 27 June 1836 | Sir Robert Vaughan | | Whig | Richard Richards | | Whig | Resignation |
| South Essex | 9 Jun 1836 | Robert Westley Hall-Dare | | Whig | George Palmer | | Whig | Death |
| Kilkenny City | 17 May 1836 | Richard Sullivan | | Whig | Daniel O'Connell | | Whig | Resignation |
| Mayo | 6 May 1836 | Dominick Browne | | Whig | Robert Dillon Browne | | Whig | Elevation to the Irish peerage |
| Paisley | 17 March 1836 | Alexander Graham Speirs | | Whig | Archibald Hastie | | Whig | Resignation |
| Clonmel | 20 February 1836 | Dominick Ronayne | | Whig | Nicholas Ball | | Whig | Death |
| South Leicestershire | 18 February 1836 | Thomas Frewen Turner | | Conservative | Charles William Packe | | Conservative | Resignation |
| Glasgow | 17 February 1836 | Colin Dunlop | | Whig | Lord William Bentinck | | Whig | Resignation |
| Stoke-upon-Trent | 15 February 1836 | Richard Edensor Heathcote | | Whig | George Anson | | Whig | Resignation |
| Cockermouth | 15 February 1836 | Fretchville Lawson Ballantine Dykes | | Whig | Edward Horsman | | Whig | Resignation |
| Malton | 12 February 1836 | Charles Pepys | | Whig | John Walbanke-Childers | | Whig | Elevation to the peerage |
| Devizes | 10 February 1836 | Philip Charles Durham | | Conservative | James Whitley Deans Dundas | | Whig | Resignation |
| West Gloucestershire | 2 January 1836 | Marquess of Worcester | | Conservative | Robert Blagden Hale | | Conservative | Succession to a peerage |
| North Leicestershire | 29 December 1835 | Lord Robert Manners | | Conservative | Lord Charles Manners | | Conservative | Death |
| North Northamptonshire | 21 December 1835 | Viscount Milton | | Whig | Thomas Philip Maunsell | | Conservative | Death |
| Devizes | 25 November 1835 | Wadham Locke | | Whig | Thomas Bucknall-Estcourt | | Conservative | Death |
| County Waterford | 21 September 1835 | Patrick Power | | Whig | William Villiers-Stuart | | Whig | Death |
| Dungarvan | 21 September 1835 | Michael O'Loghlen | | Whig | Michael O'Loghlen | | Whig | Attorney-General for Ireland |
| Cashel | 4 September 1835 | Louis Perrin | | Whig | Stephen Woulfe | | Whig | Resignation (Judge of the Irish Court of the King's Bench) |
| Belfast | 27 August 1835 | John McCance | | Whig | George Dunbar | | Conservative | Death |
| Oldham | 8 July 1835 | William Cobbett | | Whig | John Frederick Lees | | Conservative | Death |
| Ayrshire | 3 July 1835 | Richard Alexander Oswald | | Whig | John Dunlop | | Whig | Resignation |
| Bury St Edmunds | 26 June 1835 | Lord Charles FitzRoy | | Whig | Lord Charles FitzRoy | | Whig | Vice-Chamberlain of the Household |
| Kingston upon Hull | 20 June 1835 | David Carruthers | | Conservative | Thomas Perronet Thompson | | Whig | Death |
| Ipswich | 19 June 1835 | Fitzroy Kelly | | Conservative | James Morrison | | Whig | Void Election |
| Ipswich | 19 June 1835 | Robert Dundas | | Conservative | Rigby Wason | | Whig | Void Election |
| County Carlow | 15 June 1835 | Henry Bruen | | Conservative | Nicholas Aylward Vigors | | Whig | Void Election |
| County Carlow | 15 June 1835 | Nicholas Aylward Vigors | | Whig | Henry Bruen | | Conservative | By-election result reversed on petition |
| County Carlow | 15 June 1835 | Thomas Kavanagh | | Conservative | Alexander Raphael | | Whig | Void Election |
| County Carlow | 15 June 1835 | Alexander Raphael | | Whig | Thomas Kavanagh | | Conservative | By-election result reversed on petition |
| Tiverton | 1 June 1835 | James Kennedy | | Whig | The Viscount Palmerston | | Whig | Resignation to provide a seat for Palmerston |
| Kildare | 26 May 1835 | Richard More O'Ferrall | | Whig | Richard More O'Ferrall | | Whig | Junior Lord of the Treasury |
| South Staffordshire | 23 May 1835 | Edward Littleton | | Whig | Francis Goodricke | | Conservative | Elevation to the peerage |
| Poole | 21 May 1835 | Sir John Byng | | Whig | George Byng | | Whig | Elevation to the peerage |
| Stroud | 19 May 1835 | Charles Richard Fox | | Whig | Lord John Russell | | Whig | Resignation to provide a seat for Russell |
| Malton | 19 May 1835 | Charles Pepys | | Whig | Charles Pepys | | Whig | First Commissioner of the Great Seal |
| Inverness-shire | 15 May 1835 | Charles Grant | | Whig | Alexander William Chisholm | | Conservative | Secretary of State for War and the Colonies and elevation to the peerage |
| Leith Burghs | 8 May 1835 | John Archibald Murray | | Whig | John Archibald Murray | | Whig | Lord Advocate |
| South Devon | 7 May 1835 | Lord John Russell | | Whig | Montague Edmund Newcombe Parker | | Conservative | Home Secretary |
| West Riding of Yorkshire | 6 May 1835 | Viscount Morpeth | | Whig | Viscount Morpeth | | Whig | Resignation pending appointment as Chief Secretary for Ireland |
| Dundee | 6 May 1835 | Sir Henry Parnell | | Whig | Sir Henry Parnell | | Whig | Treasurer of the Navy, Treasurer of the Ordnance and Paymaster of the Forces |
| Stirling Burghs | 5 May 1835 | Lord Dalmeny | | Whig | Lord Dalmeny | | Whig | Civil Lord of the Admiralty |
| North Essex | 4 May 1835 | Alexander Baring | | Conservative | John Payne Elwes | | Conservative | Elevation to the peerage |
| Dungarvan | 4 May 1835 | Michael O'Loghlen | | Whig | Michael O'Loghlen | | Whig | Solicitor-General for Ireland |
| Clackmannanshire and Kinross-shire | 4 May 1835 | Charles Adam | | Whig | Charles Adam | | Whig | First Naval Lord |
| Kirkcudbrightshire | 2 May 1835 | Robert Cutlar Fergusson | | Whig | Robert Cutlar Fergusson | | Whig | Judge Advocate General |
| Haddington Burghs | 2 May 1835 | Robert Steuart | | Whig | Robert Steuart | | Whig | Junior Lord of the Treasury |
| Elgin Burghs | 2 May 1835 | Andrew Leith Hay | | Whig | Andrew Leith Hay | | Whig | Clerk of the Ordnance |
| North Northumberland | 1 May 1835 | Viscount Howick | | Whig | Viscount Howick | | Whig | Secretary at War |
| Manchester | 30 April 1835 | Charles Poulett Thomson | | Whig | Charles Poulett Thomson | | Whig | President of the Board of Trade |
| Edinburgh | 30 April 1835 | John Campbell | | Whig | John Campbell | | Whig | Attorney General for England and Wales |
| Taunton | 29 April 1835 | Henry Labouchere | | Whig | Henry Labouchere | | Whig | Vice-President of the Board of Trade and Master of the Mint |
| Penryn and Falmouth | 28 April 1835 | Robert Monsey Rolfe | | Whig | Robert Monsey Rolfe | | Whig | Solicitor General for England and Wales |
| Cashel | 28 April 1835 | Louis Perrin | | Whig | Louis Perrin | | Whig | Attorney-General for Ireland |
| Sandwich | 27 April 1835 | Sir Edward Troubridge | | Whig | Sir Edward Troubridge | | Whig | Fourth Naval Lord |
| Newport (I.O.W.) | 27 April 1835 | William Henry Ord | | Whig | William Henry Ord | | Whig | Junior Lord of the Treasury |
| Cambridge | 27 April 1835 | Thomas Spring Rice | | Whig | Thomas Spring Rice | | Whig | Chancellor of the Exchequer |
| Berwick-upon-Tweed | 27 April 1835 | Rufane Shaw Donkin | | Whig | Rufane Shaw Donkin | | Whig | Surveyor-General of the Ordnance |
| Totnes | 24 April 1835 | Lord Seymour | | Whig | Lord Seymour | | Whig | Junior Lord of the Treasury |
| Nottingham | 24 April 1835 | Sir John Hobhouse | | Whig | Sir John Hobhouse | | Whig | President of the Board of Control |
| Drogheda | 24 April 1835 | Andrew Carew O'Dwyer | | Whig | Andrew Carew O'Dwyer | | Whig | Void Election |
| Drogheda | 24 April 1835 | Andrew Carew O'Dwyer | | Whig | Randall Edward Plunkett | | Conservative | By-Election result reversed on petition |
| North Nottinghamshire | 31 March 1835 | Viscount Lumley | | Whig | Henry Gally Knight | | Conservative | Succession to a peerage |
| Cambridge University | 21 March 1835 | Charles Manners-Sutton | | Conservative | Charles Law | | Conservative | Elevation to the peerage |
| Cardiff Boroughs | 20 March 1835 | John Iltyd Nicholl | | Conservative | John Iltyd Nicholl | | Conservative | Junior Lord of the Treasury |
| 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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 An uncontested by-election. 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 Seat vacated on appointment to the office noted. 11th Parliament (1832–1834) ||||||||||
| By-election | Date | Former incumbent | Party | Party | Winner | Party | Party | Cause |
| Louth | 24 December 1834 | Thomas FitzGerald | | Irish Repeal | Sir Patrick Bellew | | Whig | Death |
| East Gloucestershire | 14 August 1834 | Sir Berkeley Guise | | Whig | Christopher William Codrington | | Tory | Death |
| Thetford | 8 August 1834 | Lord James FitzRoy | | Whig | Earl of Euston | | Whig | Death |
| Cirencester | 6 August 1834 | Lord Apsley | | Tory | Lord Edward Somerset | | Tory | Succession to a peerage |
| Sudbury | 25 July 1834 | Michael Angelo Taylor | | Whig | Edward Barnes | | Tory | Death |
| Nottingham | 25 July 1834 | Viscount Duncannon | | Whig | Sir John Hobhouse | | Whig | Home Secretary and elevation to the peerage |
| County Wexford | 3 July 1834 | Robert Carew | | Whig | Cadwallader Waddy | | Irish Repeal | Elevation to the Irish peerage |
| Kirkcudbrightshire | 3 July 1834 | Robert Cutlar Fergusson | | Whig | Robert Cutlar Fergusson | | Whig | Judge Advocate General |
| Finsbury | 2 July 1834 | Robert Grant | | Whig | Thomas Slingsby Duncombe | | Whig | Resignation (Governor of Bombay) |
| Elgin Burghs | 30 June 1834 | Andrew Leith Hay | | Whig | Andrew Leith Hay | | Whig | Clerk of the Ordnance |
| Fermanagh | 27 June 1834 | Mervyn Archdall | | Tory | Mervyn Edward Archdale | | Tory | Resignation |
| Chatham | 26 June 1834 | William Leader Maberly | | Whig | George Byng | | Whig | Resignation (Commissioner of Customs) |
| Edinburgh | 23 June 1834 | James Abercromby | | Whig | James Abercromby | | Whig | Master of the Mint |
| Cambridge | 13 June 1834 | Thomas Spring Rice | | Whig | Thomas Spring Rice | | Whig | Secretary of State for War and the Colonies |
| Leith Burghs | 2 June 1834 | John Archibald Murray | | Whig | John Archibald Murray | | Whig | Lord Advocate |
| Edinburgh | 2 June 1834 | Francis Jeffrey | | Whig | Sir John Campbell | | Whig | Resignation (Judge of the Court of Session) |
| North Derbyshire | 27 May 1834 | Lord Cavendish of Keighley | | Whig | Lord George Cavendish | | Whig | Succession to a peerage |
| Monaghan | 17 May 1834 | Cadwallader Blayney | | Tory | Henry Westenra | | Whig | Succession to an Irish peerage |
| Monaghan | 17 May 1834 | Henry Westenra | | Whig | Edward Lucas | | Tory | By-Election result reversed on petition |
| Dungarvan | 16 May 1834 | Ebenezer Jacob | | Whig | Ebenezer Jacob | | Whig | Void By-Election |
| Wells | 5 May 1834 | Norman Lamont | | Whig | Nicholas Ridley-Colborne | | Whig | Death |
| Perthshire | 5 May 1834 | Earl of Ormelie | | Whig | George Murray | | Tory | Succession to a peerage |
| Paisley | 24 March 1834 | Sir John Maxwell | | Whig | Daniel Keyte Sandford | | Whig | Resignation |
| Thirsk | 21 March 1834 | Robert Frankland | | Whig | Samuel Crompton | | Whig | Resignation |
| Malton | 4 March 1834 | Charles Pepys | | Whig | Charles Pepys | | Whig | Solicitor General for England and Wales |
| Ayr Burghs | 3 March 1834 | Thomas Francis Kennedy | | Whig | Lord Patrick Crichton-Stuart | | Whig | Resignation |
| Dudley | 28 February 1834 | John Campbell | | Whig | Thomas Hawkes | | Tory | Attorney General for England and Wales |
| Totnes | 17 February 1834 | James Cornish | | Whig | Lord Seymour | | Whig | Resignation |
| Leeds | 17 February 1834 | Thomas Babington Macaulay | | Whig | Edward Baines | | Whig | Resignation |
| Kendal | 17 February 1834 | James Brougham | | Whig | John Foster-Barham | | Whig | Death |
| Devizes | 17 February 1834 | Montague Gore | | Whig | Philip Charles Durham | | Tory | Resignation |
| Dungarvan | 15 February 1834 | George Lamb | | Whig | Ebenezer Jacob | | Whig | Death |
| East Somerset | 3 February 1834 | William Papwell Brigstocke | | Whig | William Miles | | Tory | Death |
| Berwickshire | 13 January 1834 | Charles Albany Marjoribanks | | Whig | Sir Hugh Purves-Hume-Campbell | | Tory | Death |
| Huddersfield | 9 January 1834 | Lewis Fenton | | Whig | John Blackburne | | Whig | Death |
| Morpeth | 31 December 1833 | Frederick George Howard | | Whig | Edward George Granville Howard | | Whig | Death |
| York | 11 November 1833 | Samuel Adlam Bayntun | | Tory | Thomas Dundas | | Whig | Death |
| Buteshire | 4 September 1833 | Charles Stuart | | Tory | Sir William Rae | | Tory | Resignation |
| City of London | 12 August 1833 | Sir John Key | | Whig | William Crawford | | Whig | Resignation |
| South Staffordshire | 7 June 1833 | Edward Littleton | | Whig | Edward Littleton | | Whig | Chief Secretary for Ireland |
| Stroud | 27 May 1833 | David Ricardo | | Whig | George Julius Poulett Scrope | | Whig | Resignation |
| Tiverton | 24 May 1833 | James Kennedy | | Whig | James Kennedy | | Whig | Void Election |
| Inverness Burghs | 17 May 1833 | John Baillie | | Tory | Charles Lennox Cumming Bruce | | Tory | Death |
| West Worcestershire | 16 May 1833 | Thomas Foley | | Whig | Henry Winnington | | Whig | Succession to a peerage |
| Westminster | 11 May 1833 | Sir John Hobhouse | | Whig | George de Lacy Evans | | Whig | Seeks re-election after resigning from the ministry |
| Dundee | 17 April 1833 | George Kinloch | | Whig | Sir Henry Parnell | | Whig | Death |
| North Lancashire | 12 April 1833 | Edward Stanley | | Whig | Edward Stanley | | Whig | Secretary of State for War and the Colonies |
| Coventry | 12 April 1833 | Edward Ellice | | Whig | Edward Ellice | | Whig | Secretary at War |
| Gloucester | 9 April 1833 | Maurice Berkeley | | Whig | Henry Thomas Hope | | Tory | Fourth Naval Lord |
| Montgomery Boroughs | 8 April 1833 | David Pugh | | Tory | John Edwards | | Whig | Void Election |
| Westminster | 4 April 1833 | Sir John Hobhouse | | Whig | Sir John Hobhouse | | Whig | Chief Secretary for Ireland |
| Sunderland | 4 April 1833 | George Barrington | | Whig | William Thompson | | Tory | Resignation |
| West Cumberland | 25 March 1833 | Viscount Lowther | | Tory | Samuel Irton | | Tory | Chose to sit for Westmorland |
| Marylebone | 20 March 1833 | Edward Portman | | Whig | Samuel Whalley | | Whig | Resignation |
| Oxford | 18 March 1833 | Thomas Stonor | | Whig | William Hughes Hughes | | Whig | Void Election |
| North Northamptonshire | 9 March 1833 | Viscount Milton | | Whig | Viscount Milton | | Whig | Succession to a peerage |
| Malton | 8 March 1833 | Viscount Milton | | Whig | John Charles Ramsden | | Whig | Resignation to contest North Northamptonshire |
| Dover | 7 March 1833 | Charles Poulett Thomson | | Whig | John Halcomb | | Tory | Chose to sit for Manchester |
| City of London | 27 February 1833 | Robert Waithman | | Whig | George Lyall | | Tory | Death |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 An uncontested by-election. ↑ Election decided by a tie-breaking vote from the returning officer. The defeated candidate challenged the result but Parliament was dissolved before the issue was settled. 1 2 3 4 5 6 7 8 9 10 11 12 13 Seat vacated on appointment to the office noted. ||||||||||