| Date | Constituency | Outgoing MP | Incoming MP | Cause |
|---|
| 22 May 1820 | Tavistock | John Nicholas Fazakerly | Whig | Hugh Fortescue | Whig | Fazakerly resigned by taking the Chiltern Hundreds |
| 23 May 1820 | Appleby | George Tierney | Whig | Thomas Creevey | Whig | Tierney chose to sit for Knaresborough |
| 30 May 1820 | Scarborough | Viscount Normanby | Whig | Edmund Phipps | Tory | Viscount Normanby vacated seat |
| 23 May 1820 | Orford | Horace Beauchamp Seymour | Tory | Edmund Alexander Macnaghten | Tory | Seymour chose to sit for Lisburn |
| 31 May 1820 | Carlisle | John Christian Curwen | Whig | William James | Whig | Curwen sat for Cumberland |
| 2 June 1820 | Athlone | John McClintock | Tory | David Ker | Tory | McClintock vacated seat |
| 14 June 1820 | Saltash | Michael George Prendergast | | John Fleming | | Prendergast chose to sit for Galway Borough instead |
| 16 June 1820 | Okehampton | Albany Savile | Tory | John Campbell | Whig | Savile vacated his seat |
| 27 June 1820 | Malmesbury | Kirkman Finlay | Tory | William Leake | | Finlay resigned amid campaigns against his rectorship of the University of Glasgow |
| 27 June 1820 | Petersfield | Beaumont Hotham | | Philip Musgrave | | Hotham chose to sit for Leominster instead |
| 28 June 1820 | York | Lawrence Dundas | Whig | Robert Chaloner | Whig | Dundas ennobled |
| 29 June 1820 | Dundalk | John Metge | Tory | George Hartopp | Tory | Metge resigned seat, (appointed Escheator of Munster) |
| 29 June 1820 | Ennis | Sir Ross Mahon, Bt | Tory | Richard Wellesley | Tory | Mahon resigned seat |
| 30 June 1820 | Dublin | Rt Hon. Henry Grattan | Whig | Thomas Ellis | Tory | Grattan died 4 June 1820 |
| 13 July 1820 | Berwick-upon-Tweed | Sir David Milne | | Henry Heneage St Paul | | Milne's election declared void |
| 14 July 1820 | Colchester | Daniel Whittle Harvey | Radical | Henry Baring | Tory | Harvey's election declared void |
| 17 July 1820 | Old Sarum | Arthur Johnston Crawford | Tory | Josias du Pré Alexander | Tory | Crawford vacated seat |
| 21 July 1820 | Grantham | James Hughes | | Sir Montague Cholmeley, Bt | | Hughes election declared void |
| 11 September 1820 | County Kilkenny | James Butler, 1st Marquess of Ormonde | | Charles Harwood Butler Clarke | | Butler made Irish peer |
| 3 August 1820 | Heytesbury | Charles Ashe A'Court | | Henry Handley | | A'Court resigned |
| 10 August 1820 | County Louth | Viscount Jocelyn | | John Jocelyn | | Robert Jocelyn made Irish peer |
| 17 October 1820 | Aberdeenshire | James Ferguson | Tory | Hon. William Gordon | Tory | James Ferguson died |
| 7 November 1820 | Warwickshire | Sir Charles Mordaunt, Bt | | Francis Lawley | Whig | Mordaunt vacated his seat |
| 29 November 1820 | Westbury | Jonathan Elford | Tory | Manasseh Masseh Lopes | Tory | Elford and Barton both resigned under pressure from Lopes, who controlled the pocket borough |
| Nathaniel Barton | Tory | Philip John Miles | Tory |
| 7 December 1820 | Berwick-upon-Tweed | Henry Heneage St Paul | | Sir Francis Blake | | St Paul died |
| 9 January 1821 | St Albans | William Tierney Robarts | Whig | Sir Henry Wright-Wilson | Tory | Robarts died 9 December 1920 |
| 16 Jan 1821 | Roscommon | Arthur French I | | Arthur French II | | Arthur French I died 24 November 1820 |
| 17 January 1821 | Yarmouth | Theodore Henry Broadhead | Tory | Theodore Broadhead | Tory | Theodore Henry Broadhead died |
| 1 February 1821 | Wilton | James Harris | | John Hungerford Penruddocke | Tory | Harris succeeded to the peerage as Earl of Malmesbury |
| 9 February 1821 | Newtown | Dudley Long North | Whig | Charles Compton Cavendish | Whig | North resigned |
| 9 February 1821 | Wicklow | William Parnell-Hayes | | James Grattan | Liberal Party | Parnell-Hayes died 2 January 1821 |
| 17 February 1821 | Plympton Erle | Alexander Boswell | Tory | William Gill Paxton | | Boswell resigned due to a personal financial crisis |
| 19 February 1821 | Dunbartonshire | Archibald Campbell-Colquhoun | | John Buchanan | | Campbell-Colquhoun died 8 December 1820 |
| 9 March 1821 | New Ross | John Carroll | | Francis Leigh | Tory | Carroll resigned seat |
| 21 March 1821 | Wigtown Burghs | Hon. James Henry Keith Stewart | Tory | Sir John Osborn, Bt | Tory | Stewart vacated seat |
| 28 April 1821 | Orford | John Douglas | Tory | Marquess of Londonderry | Tory | Douglas vacated seat |
| 5 May 1821 | Ludgershall | Henry Luttrell | Tory | George Pratt | Tory | Luttrell died on 25 April 1821 |
| 9 May 1821 | Down | Robert Stewart, Viscount Castlereagh | Tory | Mathew Forde | Tory | Castlereagh made Irish peer |
| 11 May 1821 | Andover | Thomas Assheton Smith I | Tory | Thomas Assheton Smith II | Tory | Smith I resigned to become Lord Lieutenant of Caernarvonshire |
| 26 May 1821 | St Ives | James Graham | Whig | Christopher Hawkins | Tory | Graham resigned after accusations of bribing the electorate |
| 24 May 1821 | Stirlingshire | Sir Charles Edmonstone, Bt | | Henry Home-Drummond | | Edmonstone died 1 April 1821 |
| 5 June 1821 | Lymington | George Finch | | William Manning | | Finch resigned after the early death of his wife, Jane |
| 3 July 1821 | Kinsale | George Coussmaker | | Sir Josias Rowley, Bt | Tory | Coussmaker died 23 May 1821 |
| 30 July 1821 | King's County | John Clere Parsons | | William Parsons, 3rd Earl of Rosse | | John Clere Parsons made judge |
| 24 August 1821 | Oxford University | William Scott | Tory | Richard Heber | Tory | Scott was elevated to the peerage as Baron Stowell |
| 27 August 1821 | Queen's County | Hon. William Wellesley-Pole | Tory | Sir Charles Coote, Bt | Tory | Wellesley-Pole called to Upper House |
| 12 September 1821 | Shaftesbury | Edward Harbord | | Ralph Leycester | | Harbord succeeded to the peerage as Baron Suffield |
| 27 September 1821 | County Louth | John Foster | | Thomas Skeffington | | Foster called to Upper House |
| 18 October 1821 | Shropshire | John Cotes | | Rowland Hill, 2nd Viscount Hill | | Cotes died 24 August 1821 |
| 9 January 1822 | King's Lynn | Sir Martin Browne ffolkes | | Marquess of Titchfield | | ffolkes died 11 December 1821 |
| 12 January 1822 | County Antrim | Hugh Henry John Seymour | Tory | Viscount Beauchamp | | Seymour died 2 December 1821 |
| 1 February 1822 | Castle Rising | Earl of Rocksavage | Tory | Lord William Cholmondeley | Tory | Rocksavage elevated to peerage |
| 11 February 1822 | Higham Ferrers | William Plumer | Whig | Viscount Normanby | Whig | Plumer died 17 January 1822 |
| 14 February 1822 | Droitwich | Thomas Foley | Whig | John Hodgetts Hodgetts-Foley | Whig | Foley died 11 January 1822 |
| 18 February 1822 | Bletchingley | Marquess of Titchfield | Whig | Lord Francis Leveson-Gower | Tory | Titchfield resigned seat |
| 18 February 1822 | Dungarvan | Augustus William James Clifford | Whig | Hon. George Lamb | Whig | Clifford resigned seat |
| 9 March 1822 | Drogheda | Henry Metcalfe | Tory | William Meade Smyth | Tory | Metcalfe died 11 February 1822 |
| 14 March 1822 | Argyllshire | Lord John Campbell | Whig | Walter Frederick Campbell | Whig | Campbell resigned seat |
| 23 March 1822 | Lincoln | Coningsby Waldo-Sibthorpe | | John Williams | | Waldo-Sibthorpe died |
| 8 April 1822 | Dartmouth | Charles Milner Ricketts | | James Hamilton Stanhope | | Ricketts resigned seat |
| 12 April 1822 | Minehead | Henry Fownes Luttrell | Tory | John Douglas | Tory | Luttrell resigned to become a Commissioner of the Board of Audit |
| 30 April 1822 | Shaftesbury | Abraham Moore | | Robert Grosvenor | Whig | Moore resigned |
| 22 May 1822 | Saltash | Matthew Russell | | William Russell | Whig | Matthew Russell died |
| 26 June 1822 | Camelford | Francis Seymour-Conway | Tory | Sheldon Cradock | Whig | Seymour-Conway succeeded to the peerage as Marquess of Hertford |
| 30 July 1822 | Stockbridge | Joseph Foster Barham | Whig | Edward Stanley | Whig | Barham resigned after selling control of the seat |
| 30 July 1822 | Wigtownshire | James Hunter-Blair | | Sir William Maxwell, Bt | Tory | Hunter-Blair died 24 June 1822 |
| 14 August 1822 | Clitheroe | Hon. William Cust | Tory | Henry Porcher | Tory | Cust resigned seat |
| 1 October 1822 | Orford | Marquess of Londonderry | Tory | Charles Ross | Tory | Marquess of Londonderry died 12 August 1822 |
| 25 November 1822 | Derbyshire | Edward Mundy | Tory | Francis Mundy | Tory | Edward Mundy died, 18 October 1822 |
| 27 November 1822 | Cambridge University | John Henry Smyth | Whig | William John Bankes | Tory | Smyth died October 1822 |
| 2 December 1822 | Shropshire | Sir John Kynaston Powell, Bt | | John Cressett-Pelham | | Kynaston Powell died 24 October 1822 |
| 4 December 1822 | County Sligo | Charles O'Hara | Tory | Henry King | Tory | O'Hara died 19 September 1822 |
| 20 December 1822 | Ross-shire | Thomas Mackenzie | | Sir James Mackenzie, Bt | Tory | Mackenzie died 19 October 20 |
| 6 January 1823 | Wilton | Ralph Sheldon | | Edward Baker | | Sheldon died |
| 10 February 1823 | Harwich | Nicholas Vansittart | | George Canning | Tory | Vansittart resigned seat |
| Charles Bathurst | | John Charles Herries | | Bathurst resigned seat |
| 11 February 1823 | Windsor | Herbert Taylor | Tory | Edward Cromwell Disbrowe | | Taylor resigned to become colonel for life of the 85th Foot Regiment |
| 11 February 1823 | County Dublin | Hans Hamilton | Tory | Henry White | Tory | Hamilton died 22 December 1822 |
| 12 February 1823 | Peterborough | Sir James Scarlett | Whig | Sir James Scarlett | Whig | Scarlett re-elected after resigning |
| 15 February 1823 | Liverpool | George Canning | Tory | William Huskisson | Tory | Canning appointed to Crown office |
| 17 February 1823 | Berwick-upon-Tweed | Charles Bennet | | Sir John Beresford, Bt | | Charles Bennet ennobled |
| 18 February 1823 | Chichester | William Huskisson | Tory | William Stephen Poyntz | | Huskisson appointed to Crown office |
| 18 February 1823 | Winchester | James Henry Leigh | | Edward East | | Leigh resigned |
| 20 February 1823 | Winchelsea | Lucius Concannon | Whig | William Leader | Whig | Concannon died 29 January 1823 |
| 21 February 1823 | Arundel | Robert Blake | | Thomas Read Kemp | | Robert Blake died |
| 22 February 1823 | Coleraine | Sir John Beresford, Bt | Tory | Sir John William Head Brydges | Tory | Beresford resigned seat |
| 26 February 1823 | Dorset | Edward Berkeley Portman | | Edward Portman | Whig | Edward Berkeley Portman died |
| 28 February 1823 | Reigate | James Somers Cocks | | James Cocks | | James Somers Cocks resigned seat |
| 4 March 1823 | Rye | John Dodson | | Robert Knight | | Dodson vacated seat |
| 8 March 1823 | Fermanagh | Sir Galbraith Lowry Cole | | Viscount Corry | Tory | Cole appointed to Crown office |
| 18 March 1823 | Corfe Castle | George Bankes | Tory | John Bond | Tory | Bankes resigned |
| 3 April 1823 | Lymington | Harry Burrard-Neale | | Walter Boyd | | Burrard-Neale resigned to become Commander-in-Chief of the Mediterranean Fleet |
| 15 April 1823 | Haslemere | Robert Plumer Ward | Tory | George Lowther Thompson | Tory | Ward appointed to Crown office |
| 2 June 1823 | Bossiney | John Ward | Tory | John Stuart-Wortley-Mackenzie | Tory | Ward succeeded to the peerage as Viscount Dudley and Ward |
| 27 June 1823 | Hertford | Viscount Cranborne | Tory | Thomas Byron | | Viscount Cranborne succeeded as 2nd Marquess of Salisbury |
| 24 July 1823 | Newcastle-under-Lyme | William Shepherd Kinnersley | | Evelyn Denison | Kinnersley died 8 July 1923 |
| 6 December 1823 | Lincolnshire | Charles Anderson-Pelham | | William Amcotts-Ingilby | | Anderson-Pelham called to Upper House |
| 10 February 1824 | Sandwich | Joseph Marryat | | Henry Bonham | | Marryat died 12 January 1824 |
| 16 January 1824 | Liskeard | William Eliot | Tory | Lord Eliot | Tory | William Eliot called to Upper House |
| 16 February 1824 | Weobley | Lord Frederick Cavendish-Bentinck | | Lord Henry Frederick Thynne | Tory | Cavendish-Bentinck vacated seat |
| 21 February 1824 | County Louth | Thomas Skeffington | | John Leslie Foster | | Skeffington became Irish peer |
| 24 February 1824 | County Cavan | John Maxwell-Barry | Tory | Henry Maxwell, 7th Baron Farnham | Tory | Barry succeeded to Irish peerage |
| 1 March 1824 | Portarlington | David Ricardo | Whig | James Farquhar | Tory | Ricardo died 11 September 1823 |
| 4 March 1824 | Wigtown Burghs | Sir John Osborn, Bt | Tory | Nicholas Conyngham Tindal | Tory | Osborn appointed to Crown office |
| 5 March 1824 | New Ross | Francis Leigh | Tory | John Doherty | Tory | Leigh resigned seat |
| 5 March 1824 | Westmeath | Gustavus Hume Rochfort | Tory | Robert Smyth | Whig | Rochfort died 30 January 1824 |
| 8 March 1824 | Barnstaple | Michael Nolan | | Frederick Hodgson | | Nolan resigned to become Chief Justice of the Brecon Circuit |
| Oxfordshire | John Fane (b. 1751) | Tory | John Fane (b. 1775) | Tory | Fane (b. 1751) died on 8 February 1824 |
| 11 March 1824 | Plympton Erle | Ranald George Macdonald | | John Henry North | Tory | Macdonald resigned to fight a succession action in the Court of Session |
| 22 March 1824 | Queenborough | Hon. John Villiers | Tory | Lord Frederick Bentinck | Whig | Villiers called to Upper House |
| 5 April 1824 | Leitrim | Luke White | | Samuel White | | Luke White died 25 February 1824 |
| 20 April 1824 | Lancaster | Gabriel Doveton | Whig | Thomas Greene | Tory | Doveton died 9 April 1824 |
| 5 May 1824 | Dundalk | George Hartopp | Tory | Sir Robert Inglis, Bt | Tory | Hartopp died 31 March 1824 |
| 10 May 1824 | Penryn | Henry Swann | Tory | Robert Stanton | Tory | Swann died on 24 April 1824 |
| 14 May 1824 | Huntingdon | Earl of Ancram | Tory | James Stuart | | Ancram called to Upper House |
| 28 May 1824 | Northallerton | Henry Peirse (younger) | Whig | Marcus Beresford | Whig | Pierse died 14 May 1824 |
| 2 June 1824 | Okehampton | Henry Prittie | Whig | William Henry Trant | Tory | Prittie resigned seat |
| 30 June 1834 | Steyning | Lord Henry Howard-Molyneux-Howard | Whig | Henry Howard | Whig | Howard-Molyneux-Howard died 18 June 1824 |
| 13 July 1824 | Clackmannanshire | Robert Bruce | | George Ralph Abercrombie | | Bruce resigned seat |
| 27 January 1825 | Cornwall | William Lemon | Whig | Richard Vyvyan | Tory | Lemon died on 11 December 1824 |
| 4 February 1825 | Cambridge | Charles Madryll Cheere | Tory | Marquess of Graham | Tory | Cheere died 10 January 1825. |
| 18 February 1825 | Newport (Isle of Wight) | Leonard Worsley-Holmes | | John Stuart | | Worsley-Holmes died 10 January 1825 |
| 21 February 1825 | Donegal | Earl of Mount Charles | Tory | Francis Conyngham | | Henry Conyngham died 26 December 1824 |
| 28 February 1825 | Brackley | Henry Wrottesley | Tory | James Bradshaw | Tory | Wrottesley died 17 February 1825 |
| 8 March 1825 | Bramber | William Wilberforce | Independent | Arthur Gough-Calthorpe | | Wilberforce resigned seat |
| 25 March 1825 | Dartmouth | James Hamilton Stanhope | | John Hutton Cooper | | Stanhope committed suicide on 5 March 1825 |
| 30 March 1825 | Berkshire | Richard Griffin | Whig | Robert Palmer | Tory | Neville succeeded to the peerage as Baron Braybrooke and in 1825 changed name to Griffin. |
| 2 April 1825 | Carlisle | Sir James Graham, Bt | Tory | Sir Philip Musgrave, Bt | Tory | Graham died 21 March 1825 |
| 2 April 1825 | Petersfield | Philip Musgrave | | James Law Lushington | | Musgrave resigned to contest the Carlisle by-election |
| 6 April 1825 | Wigan | James Lindsay, Lord Lindsay | Tory | James Lindsay | Tory | Lord Linsay vacated seat |
| 6 May 1825 | Bere Alston | Henry Percy | | Percy Ashburnham | | Percy died |
| 27 June 1825 | Tyrone | Sir John Stewart, Bt | Tory | Hon. Henry Lowry-Corry | Tory | Sir John Stewart died 1 June 1825 |
| 8 February 1826 | Newport (Cornwall) | William Northey | Tory | Lord Charles Greatheed Bertie Percy | Tory | Northey died 19 January 1926 |
| 9 February 1826 | Exeter | William Courtenay | | Samuel Trehawke Kekewich | | Courtenay resigned to become Clerk Assistant of the Parliaments |
| 10 February 1826 | Banbury | Heneage Legge | | Arthur Legge | | Heneage Legge appointed to Crown office |
| 11 February 1826 | Warwick | Charles Mills | | John Tomes | | Milles died 29 Jan 1826 |
| 18 February 1826 | Corfe Castle | Henry Bankes | Tory | George Bankes | Tory | Henry Bankes resigned seat |
| 21 February 1826 | Northumberland | Charles John Brandling | | Matthew Bell | | Brandling died 1 February 1926 |
| 22 February 1826 | Oxford University | Richard Heber | Tory | Thomas Grimston Estcourt | Tory | Heber vacated seat |
| 1 March 1826 | Devizes | Thomas Grimston Estcourt | | George Watson-Taylor | | Estcourt resigned seat |
| 3 March 1826 | East Looe | George Watson-Taylor | Tory | Henry Perceval | Tory | Watson-Taylor resigned to stand in the Devizes by-election |
| 6 April 1826 | Mitchell | William Taylor Money | | Henry Labouchere | Whig | Money resigned to become Consul General at Venice |
| 6 April 1826 | County Carlow | Sir Ulysses Bagenal Burgh | Tory | Thomas Kavanagh | Tory | Burgh succeeded to Irish peerage |
| 8 May 1826 | Roxburghshire | Sir Alexander Don, Bt | | Henry Hepburne-Scott | | Don died 11 April 1823 |
| 17 Mar 1826 | Horsham | Sir John Aubrey, Bt | | Henry Edward Fox | Whig | Aubrey died 14 March 1826 |
