# List of Great Britain by-elections (1774–1790)

This is a list of parliamentary by-elections in Great Britain held between 1774 and 1790, with the names of the previous incumbent and the victor in the by-election.
In the absence of a comprehensive and reliable source, for party and factional alignments in this period, no attempt is made to define them in this article. The House of Commons: 1754-1790 provides some guidance to the complex and shifting political relationships, but it is significant that the compilers of that work make no attempt to produce a definitive list of each members allegiances.

## Resignations

    See Resignation from the British House of Commons for more details.
Where the cause of by-election is given as "resignation", this indicates that the incumbent was appointed on his own request to an "office of profit under the Crown". Offices used, in this period, were the Stewards of the Chiltern Hundreds, the Manor of Old Shorehamor the Manor of East Hendred. These appointments are made as a constitutional device for leaving the House of Commons, whose Members are not permitted to resign. If the vacancy was caused by appointment to another office then this office is noted in brackets.
In addition certain offices of profit, such as cabinet positions, required the MP to seek re-election. These offices are noted separately.

## By-elections

The c/u column denotes whether the by-election was a contested poll or an unopposed return. If the winner was re-elected, at the next general election and any intermediate by-elections, this is indicated by an * following the c or u. In a few cases the winner was elected at the next general election but had not been re-elected in a by-election after the one noted. In those cases no * symbol is used.

### 14th Parliament (1774–1780)

| Date | Constituency | c/u | Former Incumbent | Winner | Cause |
| 24 December 1774 | Wendover | u | John Adams | Henry Drummond | Chose to sit for Carmarthen |
| 27 December 1774 | Gatton | u* | Sir William Mayne | Robert Mayne | Chose to sit for Canterbury |
| 27 December 1774 | Gatton | u | Robert Scott | William Adam | Chose to sit for Wootton Bassett |
| 27 December 1774 | Midhurst | u | Herbert Mackworth | Henry Seymour Conway | Chose to sit for Cardiff Boroughs |
| 27 December 1774 | Midhurst | u* | Clement Tudway | John Ord | Chose to sit for Wells |
| 28 December 1774 | Cricklade | c(*) | William Earle | Samuel Peach | Death (Two MPs elected due to a Double Return) |
| 28 December 1774 | Cricklade | c(*) | William Earle | John Dewar | Death (Two MPs elected due to a Double Return) |
| 28 December 1774 | Winchester | u | Henry Penton | Henry Penton | Lord of the Admiralty |
| 29 December 1774 | Mitchell | u | James Scawen | Thomas Howard | Chose to sit for Surrey |
| 30 December 1774 | Great Bedwyn | u | The Earl of Courtown | Viscount Cranborne | Resignation |
| 30 December 1774 | Newport (Cornwall) | u | Humphry Morice | John Frederick | Chose to sit for Launceston |
| 31 December 1774 | Minehead | u | Henry Fownes Luttrell | Thomas Pownall | Resignation |
| 2 January 1775 | Castle Rising | u | Alexander Wedderburn | Charles Finch | Chose to sit for Okehampton |
| 2 January 1775 | East Looe | u | Charles Whitworth | Thomas Graves | Resignation to contest Saltash |
| 3 January 1775 | Saltash | u | Thomas Bradshaw | Charles Whitworth | Death |
| 3 January 1775 | Winchelsea | u | Arnold Nesbitt | William Nedham | Chose to sit for Cricklade |
| 6 January 1775 | Richmond | u | Thomas Dundas | Charles Dundas | Chose to sit for Stirlingshire |
| 11 January 1775 | Nottinghamshire | u* | Thomas Willoughby | Lord Charles Edward Bentinck | Succeeded to a peerage |
| 12 January 1775 | Leicestershire | c* | Thomas Noel | John Peach Hungerford | Succeeded to a peerage |
| 30 January 1775 | Cockermouth | u | George Johnstone | Ralph Gowland | Chose to sit for Appleby |
| 30 January 1775 | Cockermouth | u | Fletcher Norton | James Adair | Chose to sit for Carlisle |
| 30 January 1775 | Derby | c | Wenman Coke | John Gisborne | Chose to sit for Norfolk |
| 30 January 1775 | Derby | c | John Gisborne | Daniel Coke | By-election results reversed on petition 8 February 1776 |
| 2 February 1775 | East Retford | u | Lord Thomas Pelham Clinton | William Hanger | Chose to sit for Westminster |
| 4 February 1775 | Derbyshire | u* | Godfrey Bagnall Clarke | Nathaniel Curzon | Death |
| 6 February 1775 | Yarmouth | u | Edward Meux Worsley | James Worsley | Resignation |
| 7 February 1775 | Plympton Erle | u | Paul Henry Ourry | John Durand | Resignation (Commissioner of the Navy) |
| 20 February 1775 | Wilton | u* | Nicholas Herbert | Charles Herbert | Death |
| 28 February 1775 | Malton | u* | Edmund Burke | William Weddell | Chose to sit for Bristol |
| 4 March 1775 | Cricklade | c | Samuel Peach | Samuel Peach | By-election Voided due to a Double Return |
| 4 March 1775 | Cricklade | c | John Dewar | Samuel Peach | By-election Voided due to a Double Return |
| 4 March 1775 | Cricklade | c | Samuel Peach | John Dewar | By-election results reversed on petition 19 February 1776 |
| 11 March 1775 | Abingdon | u* | John Mayor | John Mayor | Void Election |
| 13 March 1775 | Boroughbridge | u | Charles Mellish | William Phillips | Chose to sit for Pontefract |
| 15 March 1775 | Wendover | u | Joseph Bullock | Thomas Dummer | Resignation |
| 17 March 1775 | Shrewsbury | u | The Lord Clive | John Corbet | Death |
| 22 March 1775 | Worcestershire | u* | William Dowdeswell | William Lygon | Death |
| 27 March 1775 | Bury St Edmunds | c* | Augustus John Hervey | Henry Seymour Conway | Succeeded to a peerage |
| 5 April 1775 | Heytesbury | u | William Gordon | William Gordon | Groom of the Bedchamber |
| 12 April 1775 | Scarborough | u | Sir Hugh Palliser | Sir Hugh Palliser | Naval Lord |
| 19 April 1775 | Knaresborough | u | Sir Anthony Abdy | Lord George Cavendish | Resignation |
| 20 April 1775 | Rye | u* | Middleton Onslow | Thomas Onslow | Resignation |
| 24 April 1775 | Newtown | u | Harcourt Powell | Charles Ambler | Resignation |
| 16 May 1775 | St Ives | u* | William Praed | Sir Thomas Wynn | Void Election |
| 23 May 1775 | Wigan | u | Beaumont Hotham | John Morton | Resignation (Baron of the Exchequer) |
| 31 May 1775 | Carlisle | u | Fletcher Norton | Walter Spencer Stanhope | Resignation |
| 5 June 1775 | East Looe | u* | Thomas Graves | William Graves | Resignation |
| 7 June 1775 | West Looe | u | Charles Ogilvie | John Rogers | Resignation |
| 8 June 1775 | Edinburghshire | u* | Henry Dundas | Henry Dundas | Lord Advocate |
| 14 June 1775 | Surrey | c* | Sir Francis Vincent | Sir Joseph Mawbey | Death |
| 17 June 1775 | Peeblesshire | u | Sir James William Montgomery | Adam Hay | Resignation (Chief Baron of the Scottish Exchequer) |
| 30 October 1775 | Ripon | u | Charles Allanson | William Lawrence | Death |
| 3 November 1775 | Hastings | u* | Charles Jenkinson | Charles Jenkinson | Clerk of the Pells in Ireland |
| 8 November 1775 | Malmesbury | u | Charles James Fox | Charles James Fox | Seeks re-election upon inheriting and then resigning the office of Clerk of the Pells in Ireland |
| 15 November 1775 | Cornwall | u* | Sir John Molesworth | Edward Eliot | Death |
| 15 November 1775 | East Grinstead | u* | Lord George Germain | Lord George Germain | Secretary of State for the Colonies |
| 23 November 1775 | St Germans | u | Edward Eliot | John Pownall | Resignation to contest Cornwall |
| 24 November 1775 | Bath | u | John Smith | Sir John Sebright | Death |
| 28 November 1775 | Essex | u | John Conyers | William Harvey | Death |
| 29 November 1775 | Eye | u | John St John | John St John | Surveyor General of the Land Revenues of the Crown |
| 4 December 1775 | Newtown | u* | Sir John Barrington | Edward Meux Worsley | Resignation |
| 7 December 1775 | Westmorland | u* | Sir James Lowther | James Lowther | Chose to sit for Cumberland |
| 14 December 1775 | Ilchester | c | Peregrine Cust | Nathaniel Webb | Void Election |
| 14 December 1775 | Ilchester | c | William Innes | Owen Salusbury Brereton | Void Election |
| 14 December 1775 | Peeblesshire | u | Adam Hay | Sir Robert Murray Keith | Death |
| 16 December 1775 | Stockbridge | c* | John Luttrell | James Luttrell | Resignation |
| 19 December 1775 | Richmond | u | Sir Lawrence Dundas | William Norton | Chose to sit for Edinburgh |
| 1 January 1776 | Hedon | c | Sir Charles Saunders | Lewis Thomas Watson | Death |
| 17 January 1776 | Ayr Burghs | u* | Sir George Macartney | Frederick Stuart | Resignation (Governor of Grenada) |
| 24 January 1776 | Fifeshire | c | John Scott | James Townsend Oswald | Death |
| 31 January 1776 | Huntingdon | u* | William Augustus Montagu | The Lord Mulgrave | Death |
| 19 February 1776 | Salisbury | u* | Viscount Folkestone | William Henry Bouverie | Succeeded to a peerage |
| 21 February 1776 | Berkshire | u* | Christopher Griffith | Winchcombe Henry Hartley | Death |
| 11 March 1776 | New Woodstock | u* | William Eden | William Eden | Lord of Trade |
| 26 March 1776 | Lancashire | u | Lord Stanley | Thomas Stanley | Succeeded to a peerage |
| 8 April 1776 | Tewkesbury | u* | Joseph Martin | James Martin | Death |
| 6 May 1776 | Gloucestershire | c* | Edward Southwell | William Bromley Chester | Succeeded to a peerage |
| 8 May 1776 | Norfolk | u* | Wenman Coke | Thomas William Coke | Death |
| 16 May 1776 | Hindon | c | Richard Smith | Richard Smith | Void Election |
| 16 May 1776 | Hindon | c | Thomas Brand Hollis | Henry Dawkins | Void Election |
| 17 May 1776 | Shaftesbury | c | Francis Sykes | George Rous | On Petition both incumbents were unseated and replaced by Hans Winthrop Mortimer. A by-election was held for the second seat. |
| 17 May 1776 | Shaftesbury | c | Sir Thomas Rumbold | George Rous | On Petition both incumbents were unseated and replaced by Hans Winthrop Mortimer. A by-election was held for the second seat. |
| 18 May 1776 | Portsmouth | u | Sir Edward Hawke | Maurice Suckling | Elevated to the peerage |
| 20 May 1776 | Bossiney | u* | Lord Mount Stuart | Charles Stuart | Elevated to the peerage |
| 20 May 1776 | Grantham | u | Sir Brownlow Cust | Peregrine Cust | Elevated to the peerage |
| 20 May 1776 | Tiverton | u* | Nathaniel Ryder | John Wilmot | Elevated to the peerage |
| 22 May 1776 | Herefordshire | c* | Thomas Foley | Thomas Harley | Elevated to the peerage |
| 29 May 1776 | Wareham | u | Christopher D'Oyly | Christopher D'Oyly | Commissary General of Musters |
| 31 May 1776 | St Germans | u | John Pownall | John Peachey | Resignation (Commissioner of Excise) |
| 16 July 1776 | Morpeth | u | William Byron | Gilbert Elliot | Death |
| 3 September 1776 | Devon | u | Sir Richard Bampfylde | John Rolle Walter | Death |
| 27 September 1776 | Leominster | u | Thomas Hill | Frederick Cornewall | Death |
| 28 October 1776 | Horsham | u | Jeremiah Dyson | The Earl of Drogheda | Death |
| 4 November 1776 | Camelford | u* | Francis Herne | Sir Ralph Payne | Death |
| 4 November 1776 | Haslemere | u | Thomas More Molyneux | Peter Burrell | Death |
| 6 November 1776 | Southampton | u | Hans Stanley | Hans Stanley | Cofferer of the Household |
| 7 November 1776 | Cambridge | c* | Charles Sloane Cadogan | Benjamin Keene | Succeeded to a peerage |
| 9 November 1776 | Exeter | c* | John Rolle Walter | John Baring | Resignation to contest Devon |
| 25 November 1776 | Sandwich | u | William Hey | Charles Brett | Resignation (Commissioner of Customs) |
| 28 November 1776 | Lostwithiel | u* | Charles Brett | Thomas Potter | Resignation to contest Sandwich |
| 17 December 1776 | Westminster | u | Earl Percy | Viscount Petersham | Succeeded to a peerage |
| 5 February 1777 | Hindon | c | Richard Smith | Archibald Macdonald | Void Election |
| 20 February 1777 | Morpeth | u | Sir Gilbert Elliot | John William Egerton | Resignation to contest Roxburghshire |
| 27 February 1777 | Roxburghshire | u* | Sir Gilbert Elliot | Sir Gilbert Elliot | Death |
| 4 March 1777 | Aldborough | u | Charles Wilkinson | William Baker | Resignation |
| 14 March 1777 | Edinburghshire | u* | Henry Dundas | Henry Dundas | Joint Keeper of the Signet |
| 27 March 1777 | Lanarkshire | u* | Andrew Stuart | Andrew Stuart | Joint Keeper of the Signet |
| 18 April 1777 | Nairnshire | u | Cosmo Gordon | John Campbell | Resignation (Baron of the Exchequer in Scotland) |
| 2 May 1777 | Boston | u* | Charles Amcotts | Humphrey Sibthorp | Death |
| 16 May 1777 | Maidstone | c | Lord Guernsey | Charles Finch | Succeeded to a peerage |
| 20 May 1777 | Rye | u* | Rose Fuller | William Dickinson | Death |
| 24 May 1777 | Castle Rising | u* | Charles Finch | John Chetwynd Talbot | Resignation to contest Maidstone |
| 29 May 1777 | Haddingtonshire | u | Sir George Suttie | William Hamilton Nisbet | Resignation |
| 11 June 1777 | Lyme Regis | u | Henry Fane | Francis Fane | Death |
| 11 June 1777 | Great Yarmouth | c* | Charles Townshend | Charles Townshend | Vice-Treasurer of Ireland |
| 13 June 1777 | Tamworth | u | Thomas de Grey | Thomas de Grey | Lord of Trade |
| 13 June 1777 | Weymouth and Melcombe Regis | u* | Welbore Ellis | Welbore Ellis | Treasurer of the Navy |
| 14 June 1777 | Wilton | u | Charles Herbert | Charles Herbert | Groom of the Bedchamber |
| 16 June 1777 | Camelford | u | Sir Ralph Payne | Sir Ralph Payne | Third Clerk Comptroller of the Green Cloth |
| 18 June 1777 | Bewdley | u* | The Lord Westcote | The Lord Westcote | Junior Lord of the Treasury |
| 26 June 1777 | Flint Boroughs | u | Sir John Glynne | Watkin Williams | Death |
| 4 July 1777 | Montgomery | u* | Whitshed Keene | Whitshed Keene | Resignation |
| 29 July 1777 | Radnorshire | u | Chase Price | Thomas Johnes | Death |
| 26 November 1777 | Portsmouth | c* | Peter Taylor | William Gordon | Death |
| 27 November 1777 | Droitwich | u* | Thomas Foley | Edward Winnington | Succeeded to a peerage |
| 29 November 1777 | Bath | u* | Abel Moysey | Abel Moysey | Second Justice of Brecon Circuit |
| 1 December 1777 | Midhurst | u | John Ord | John Ord | Attorney-General of the Duchy of Lancaster |
| 1 December 1777 | New Woodstock | u* | John Skynner | Viscount Parker | Resignation (Chief Baron of the Exchequer) |
| 10 December 1777 | Dunwich | u* | Miles Barne | Barne Barne | Resignation |
| 15 December 1777 | Huntingdon | u* | The Lord Mulgrave | The Lord Mulgrave | Lord of the Admiralty |
| 17 December 1777 | Hastings | u* | The Viscount Palmerston | The Viscount Palmerston | Junior Lord of the Treasury |
| 17 December 1777 | Newport (I.o.W.) | u* | Sir Richard Worsley | Sir Richard Worsley | Third Clerk Comptroller of the Green Cloth |
| 9 January 1778 | Anstruther Burghs | u | Philip Anstruther | George Damer | Resignation |
| 16 February 1778 | Bridgnorth | u* | The Lord Pigot | Hugh Pigot | Death |
| 24 February 1778 | East Retford | u* | William Hanger | Lord John Pelham Clinton | Resignation to contest Aldborough |
| 6 March 1778 | Aldborough | u | Abel Smith | William Hanger | Resignation |
| 23 April 1778 | Brecon | u* | Charles Van | Charles Gould | Death |
| 24 April 1778 | Harwich | u* | Edward Harvey | George Augustus North | Death |
| 27 May 1778 | Lostwithiel | u | Thomas Potter | Thomas Potter | Second Justice of Anglesey |
| 3 June 1778 | St Germans | u | Benjamin Langlois | Benjamin Langlois | Storekeeper of the Ordnance |
| 5 June 1778 | Plymouth | u | The Viscount Barrington | Viscount Lewisham | Resignation |
| 9 June 1778 | Banbury | u* | Lord North | Lord North | Lord Warden of the Cinque Ports |
| 10 June 1778 | Horsham | u* | James Wallace | James Wallace | Solicitor General for England and Wales |
| 10 June 1778 | Tamworth | u | Edward Thurlow | Anthony Chamier | Elevated to the peerage |
| 10 June 1778 | Weymouth and Melcombe Regis | u | John Tucker | Gabriel Steward | Resignation |
| 11 June 1778 | Okehampton | u | Alexander Wedderburn | Humphrey Minchin | Attorney General for England and Wales |
| 15 June 1778 | Bishop's Castle | u | Henry Strachey | Alexander Wedderburn | Clerk of the Deliveries of the Ordnance |
| 10 August 1778 | Portsmouth | u* | Maurice Suckling | Robert Monckton | Death |
| 1 October 1778 | Saltash | u | Charles Whitworth | Henry Strachey | Death |
| 9 October 1778 | Nottingham | u | Sir Charles Sedley | Abel Smith | Death |
| 4 December 1778 | Lymington | u | Sir Harry Burrard | Henry Goodricke | Resignation |
| 5 December 1778 | Callington | c* | John Dyke Acland | George Stratton | Death |
| 9 December 1778 | Nottinghamshire | u* | Earl of Lincoln | Charles Medows | Death |
| 22 December 1778 | Hastings | u | Charles Jenkinson | Charles Jenkinson | Secretary at War |
| 26 December 1778 | St Ives | u* | Adam Drummond | Philip Dehany | Resignation to contest Aberdeen Burghs |
| 1 January 1779 | Montgomery | u* | Whitshed Keene | Whitshed Keene | Surveyor of the King's Works |
| 11 January 1779 | Aberdeen Burghs | u* | Thomas Lyon | Adam Drummond | Resignation |
| 26 January 1779 | Newcastle-under-Lyme | u* | Sir George Hay | Viscount Trentham | Death |
| 9 February 1779 | Nottingham | u* | Abel Smith | Robert Smith | Death |
| 27 February 1779 | Scarborough | u* | Sir Hugh Palliser | Charles Phipps | Resignation |
| 1 March 1779 | Callington | c* | George Stratton | George Stratton | By-election results voided 15 February 1779 |
| 20 March 1779 | Westbury | u* | Nathaniel Bayly | Samuel Estwick | Resignation |
| 30 March 1779 | Aldeburgh | u* | Thomas Fonnereau | Martyn Fonnereau | Death |
| 31 March 1779 | Bishop's Castle | u* | George Clive | William Clive | Death |
| 8 April 1779 | Plympton Erle | u | The Lord Milford | William Fullarton | Resignation |
| 15 April 1779 | Berwickshire | u | Sir James Pringle | Sir John Paterson | Resignation |
| 20 April 1779 | Westminster | u | Viscount Petersham | Viscount Malden | Succeeded to a peerage |
| 29 April 1779 | Cricklade | u* | Arnold Nesbitt | John Macpherson | Death |
| 29 April 1779 | Elginshire | u* | Arthur Duff | Lord William Gordon | Resignation |
| 11 May 1779 | Essex | u* | William Harvey | Thomas Berney Bramston | Death |
| 10 June 1779 | Cambridge University | c* | Marquess of Granby | James Mansfield | Succeeded to a peerage |
| 15 June 1779 | Christchurch | u | Lord Hyde | Lord Hyde | Resignation to contest Cambridge University |
| 2 July 1779 | Fifeshire | c(*) | James Townsend Oswald | Robert Skene | Resignation (Auditor of the Exchequer in Scotland) |
| 2 July 1779 | Fifeshire | c(*) | Robert Skene | John Henderson | By-election results reversed on petition 7 February 1780 |
| 12 July 1779 | Liskeard | u | Edward Gibbon | Edward Gibbon | Lord of Trade |
| 12 July 1779 | Truro | u* | Bamber Gascoyne | Bamber Gascoyne | Lord of the Admiralty |
| 16 July 1779 | Edinburghshire | u* | Henry Dundas | Henry Dundas | Keeper of the Signet |
| 16 July 1779 | Linlithgowshire | u* | Sir William Cunynghame | Sir William Cunynghame | Third Clerk Comptroller of the Green Cloth |
| 23 July 1779 | Lanarkshire | u* | Andrew Stuart | Andrew Stuart | Lord of Trade |
| 2 September 1779 | Carmarthenshire | u* | George Rice | John Vaughan | Death |
| 8 September 1779 | Downton | u | John Cooper | Thomas Duncombe | Death |
| 22 September 1779 | Mitchell | u* | Thomas Howard | Francis Hale | Succeeded to a peerage |
| 25 October 1779 | Buckinghamshire | u* | George Grenville | Thomas Grenville | Succeeded to a peerage |
| 28 October 1779 | Middlesex | u | John Glynn | Thomas Wood | Death |
| 13 December 1779 | Hampshire | c* | Sir Simeon Stuart | Jervoise Clarke Jervoise | Death |
| 15 December 1779 | Lincolnshire | u* | Lord Brownlow Bertie | Sir John Thorold | Succeeded to a peerage |
| 16 December 1779 | Yarmouth | u | Jervoise Clarke Jervoise | Robert Kingsmill | Resignation to contest Hampshire |
| 17 December 1779 | Downton | c(*) | Thomas Duncombe | Bartholomew Bouverie | Death |
| 17 December 1779 | Downton | c(*) | Bartholomew Bouverie | Robert Shafto | By-election results reversed on petition 21 February 1780 |
| 22 December 1779 | Oxfordshire | u* | Lord Charles Spencer | Lord Charles Spencer | Treasurer of the Chamber |
| 4 January 1780 | Devon | u* | John Rolle Walter | John Rolle | Death |
| 29 January 1780 | Southampton | u | Hans Stanley | John Fuller | Death |
| 1 February 1780 | Newport (I.o.W.) | u* | Sir Richard Worsley | Sir Richard Worsley | Comptroller of the Household |
| 5 February 1780 | Orford | u* | Viscount Beauchamp | Viscount Beauchamp | Cofferer of the Household |
| 15 February 1780 | Coventry | u | Walter Waring | John Baker Holroyd | Death |
| 22 February 1780 | Lancashire | u* | Thomas Stanley | Thomas Stanley | Death |
| 23 February 1780 | Haddington Burghs | u* | John Maitland | Francis Charteris | Death |
| 1 March 1780 | Cheshire | u* | Samuel Egerton | Sir Robert Salusbury Cotton | Death |
| 31 March 1780 | Weobley | u* | William Lynch | Andrew Bayntun Rolt | Resignation |
| 27 May 1780 | Maldon | u* | Richard Savage Nassau | Eliab Harvey | Death |
| 31 May 1780 | Plymouth | c* | Sir Charles Hardy | Sir Frederick Lehman Rogers | Death |
| 12 June 1780 | Cardigan Boroughs | u* | Thomas Johnes | John Campbell | Resignation to contest Radnorshire |
| 26 June 1780 | Bishop's Castle | u* | Alexander Wedderburn | Henry Strachey | Resignation (Chief Justice of the Common Pleas) |
| 12 July 1780 | Horsham | u* | James Wallace | James Wallace | Attorney General for England and Wales |
| 12 July 1780 | Saltash | u | Henry Strachey | Paul Wentworth | Resignation to contest Bishop's Castle |
| 26 July 1780 | Radnorshire | u* | Thomas Johnes | Thomas Johnes | Death |
| 21 August 1780 | Wigan | u* | John Morton | Henry Simpson Bridgeman | Death |

### 15th Parliament (1780–1784)

| Date | Constituency | c/u | Former Incumbent | Winner | Cause |
| 27 November 1780 | Tamworth | u* | Anthony Chamier | John Calvert | Death |
| 28 November 1780 | Aldborough | u | Sir Richard Sutton | Edward Onslow | Chose to sit for Sandwich |
| 28 November 1780 | Devizes | u | Charles Garth | Henry Jones | Resignation (Commissioner of Excise) |
| 28 November 1780 | Huntingdon | u | Sir George Wombwell | Sir Hugh Palliser | Death |
| 28 November 1780 | Launceston | u* | Viscount Cranborne | Charles George Perceval | Succeeded to a peerage |
| 28 November 1780 | City of London | u* | John Kirkman | John Sawbridge | Death |
| 28 November 1780 | Malmesbury | u | Viscount Lewisham | John Calvert | Chose to sit for Staffordshire |
| 28 November 1780 | Steyning | u | Filmer Honywood | John Bullock | Chose to sit for Kent |
| 29 November 1780 | Midhurst | u | John St John | Sir Sampson Gideon | Chose to sit for Newport (I.o.W.) |
| 30 November 1780 | Horsham | u | Viscount Lewisham | Sir George Osborn | Chose to sit for Staffordshire |
| 30 November 1780 | Plympton Erle | u | Viscount Cranborne | James Archibald Stuart | Succeeded to a peerage |
| 30 November 1780 | Weymouth and Melcombe Regis | u* | Warren Lisle | Gabriel Steward | Resignation |
| 1 December 1780 | Lostwithiel | u | John St John | George Johnstone | Chose to sit for Newport (I.o.W.) |
| 2 December 1780 | Bere Alston | u* | Lord Algernon Percy | Viscount Feilding | Chose to sit for Northumberland |
| 4 December 1780 | Heytesbury | u | William Eden | Francis Nathaniel Burton | Chose to sit for New Woodstock |
| 4 December 1780 | Seaford | c | John Robinson | Christopher D'Oyly | Chose to sit for Harwich |
| 7 December 1780 | Malton | u* | Savile Finch | Edmund Burke | Resignation to provide a seat for Burke |
| 9 December 1780 | Northallerton | u* | Daniel Lascelles | Edwin Lascelles | Resignation |
| 9 December 1780 | Wenlock | u | Thomas Whitmore | George Forester | Chose to sit for Bridgnorth |
| 12 December 1780 | Haslemere | u | Sir James Lowther | Walter Spencer Stanhope | Chose to sit for Cumberland |
| 12 December 1780 | Lyme Regis | c* | Henry Fane | Henry Fane | Election voided due to a Double Return |
| 12 December 1780 | Lyme Regis | c | Lionel Darell | Henry Fane | Election voided due to a Double Return |
| 12 December 1780 | Lyme Regis | c | David Robert Michel | David Robert Michel | Election voided due to a Double Return |
| 12 December 1780 | Lyme Regis | c | Henry Harford | David Robert Michel | Election voided due to a Double Return |
| 8 January 1781 | Appleby | u* | William Lowther | William Pitt the Younger | Chose to sit for Carlisle |
| 24 January 1781 | Gloucestershire | u | William Bromley Chester | James Dutton | Death |
| 29 January 1781 | Christchurch | u* | James Harris | John Frederick | Death |
| 14 February 1781 | Bere Alston | u | The Lord Macartney | Laurence Cox | Resignation |
| 26 February 1781 | Bristol | c | Sir Henry Lippincott | George Daubeny | Death |
| 3 March 1781 | Great Bedwyn | u | Paul Methuen | Paul Cobb Methuen | Resignation |
| 12 March 1781 | Helston | u | Jocelyn Deane | Richard Barwell | Death |
| 26 March 1781 | Arundel | u | Sir Patrick Crauford | Peter William Baker | Void Election |
| 5 April 1781 | Honiton | c | Alexander Macleod | Jacob Wilkinson | Void Election |
| 6 April 1781 | Kirkcudbrightshire | c(*) | Peter Johnston | John Gordon | Void Election |
| 6 April 1781 | Kirkcudbrightshire | c(*) | John Gordon | Peter Johnston | By-election results reversed on petition 6 February 1782 |
| 9 April 1781 | Richmond | u | Sir Lawrence Dundas | George Fitzwilliam | Chose to sit for Edinburgh |
| 12 April 1781 | Berwickshire | u | Hugh Scott | Hugh Scott | Void Election |
| 14 April 1781 | Yarmouth | u | Edward Rushworth | Sir Thomas Rumbold | Resignation |
| 30 April 1781 | Weymouth and Melcombe Regis | u | William Chaffin Grove | William Richard Rumbold | Resignation |
| 4 June 1781 | Lostwithiel | u | Thomas de Grey | Viscount Malden | Succeeded to a peerage |
| 5 June 1781 | Ripon | u* | William Aislabie | William Lawrence | Death |
| 8 June 1781 | Aldborough | u | Edward Onslow | Sir Samuel Fludyer | Resignation |
| 25 June 1781 | Lymington | u | Thomas Dummer | Edward Gibbon | Death |
| 26 June 1781 | Radnorshire | u* | Thomas Johnes | Thomas Johnes | Auditor of the King’s Land Revenue in Wales |
| 30 June 1781 | Helston | c* | Philip Yorke | Lord Hyde | Resignation |
| 3 July 1781 | Knaresborough | u* | Robert Walsingham | James Hare | Death |
| 16 July 1781 | Caernarvon Boroughs | u* | Glyn Wynn | Glyn Wynn | Receiver General of Land Revenue in North Wales and Cheshire |
| 26 July 1781 | Morpeth | u | Anthony Morris Storer | Anthony Morris Storer | Lord of Trade |
| 16 August 1781 | Ayrshire | u | Sir Adam Fergusson | Sir Adam Fergusson | Lord of Trade |
| 24 August 1781 | Lanarkshire | u | Andrew Stuart | Andrew Stuart | Seeks re-election upon becoming Keeper of the Register of Sasines in Scotland |
| 3 September 1781 | Heytesbury | u | William Ashe-à Court | William Pierce Ashe à Court | Death |
| 2 October 1781 | City of London | c* | George Hayley | Sir Watkin Lewes | Death |
| 17 October 1781 | Colchester | c* | Isaac Martin Rebow | Christopher Potter | Death |
| 17 October 1781 | Colchester | c* | Christopher Potter | Edmund Affleck | By-election results reversed on petition 4 March 1782 |
| 29 October 1781 | Edinburgh | u* | Sir Lawrence Dundas | James Hunter Blair | Death |
| 29 November 1781 | Derbyshire | u* | Lord Richard Cavendish | Lord George Cavendish | Death |
| 4 December 1781 | Milborne Port | u* | Thomas Hutchings Medlycott | John Pennington | Resignation |
| 17 December 1781 | East Retford | u* | Lord John Pelham Clinton | Earl of Lincoln | Death |
| 2 January 1782 | Castle Rising | u | John Chetwynd Talbot | John Chetwynd Talbot | Lord of Trade |
| 2 February 1782 | Bramber | u | Thomas Thoroton | Henry Fitzroy Stanhope | Resignation (Agent to the Regiment of Militia in Leicestershire) |
| 11 February 1782 | Forfarshire | c* | The Earl Panmure | Archibald Douglas | Death |
| 18 February 1782 | Weymouth and Melcombe Regis | u* | Welbore Ellis | Welbore Ellis | Secretary of State for the Colonies |
| 19 February 1782 | Buckingham | u* | Richard Aldworth Neville | William Wyndham Grenville | Agent to the Regiment of Militia in Buckinghamshire |
| 19 February 1782 | East Grinstead | u* | Lord George Germain | Henry Arthur Herbert | Elevated to the peerage |
| 21 February 1782 | Reading | c* | John Dodd | Richard Aldworth Neville | Death |
| 11 March 1782 | Chichester | c | William Keppel | Percy Charles Wyndham | Death |
| 20 March 1782 | West Looe | u | John Buller | John Somers Cocks | Resignation |
| 20 March 1782 | Taunton | c* | John Roberts | Benjamin Hammet | Death |
| 23 March 1782 | Boston | u* | Lord Robert Bertie | Sir Peter Burrell | Death |
| 28 March 1782 | Inverness-shire | u | Simon Fraser | Archibald Campbell Fraser | Death |
| 2 April 1782 | Honiton | u* | Sir George Yonge | Sir George Yonge | Vice-Treasurer of Ireland |
| 3 April 1782 | Cambridge University | u* | John Townshend | John Townshend | Lord of the Admiralty |
| 3 April 1782 | Eye | u | Arnoldus Jones Skelton | William Cornwallis | Resignation |
| 3 April 1782 | Northampton | u | Viscount Althorp | Viscount Althorp | Junior Lord of the Treasury |
| 3 April 1782 | Westminster | u* | Charles James Fox | Charles James Fox | Foreign Secretary |
| 3 April 1782 | Whitchurch | u* | Thomas Townshend | Thomas Townshend | Secretary at War |
| 3 April 1782 | York | u* | Lord John Cavendish | Lord John Cavendish | Chancellor of the Exchequer |
| 4 April 1782 | Bridgnorth | u | Hugh Pigot | Hugh Pigot | Naval Lord |
| 4 April 1782 | Buckingham | u* | James Grenville | James Grenville | Junior Lord of the Treasury |
| 4 April 1782 | Guildford | u | Sir Fletcher Norton | William Norton | Elevated to the peerage |
| 4 April 1782 | Higham Ferrers | u* | Frederick Montagu | Frederick Montagu | Junior Lord of the Treasury |
| 4 April 1782 | Knaresborough | u* | Viscount Duncannon | Viscount Duncannon | Lord of the Admiralty |
| 4 April 1782 | Malton | u* | Edmund Burke | Edmund Burke | Paymaster of the Forces |
| 5 April 1782 | Calne | u* | Isaac Barré | Isaac Barré | Treasurer of the Navy |
| 5 April 1782 | Calne | u* | John Dunning | James Townsend | Chancellor of the Duchy of Lancaster and Elevation to the peerage |
| 6 April 1782 | Thetford | u | Charles Fitzroy Scudamore | Earl of Euston | Resignation |
| 10 April 1782 | Surrey | u | Augustus Keppel | Viscount Althorp | First Lord of the Admiralty and elevation to the peerage |
| 16 April 1782 | Dartmouth | u* | The Viscount Howe | Charles Brett | Became a British Peer |
| 20 April 1782 | Clitheroe | u* | John Parker | John Lee | Resignation to provide a seat for Lee |
| 22 April 1782 | Hindon | c* | Lloyd Kenyon | Lloyd Kenyon | Attorney General for England and Wales |
| 25 April 1782 | Elginshire | u | Lord William Gordon | Lord William Gordon | Vice Admiral of Scotland |
| 25 April 1782 | Sussex | u* | Thomas Pelham | Thomas Pelham | Surveyor-General of the Ordnance |
| 26 April 1782 | Northampton | u | Viscount Althorp | The Lord Lucan | Resignation to contest Surrey |
| 4 May 1782 | Huntingdonshire | u* | The Earl Ludlow | The Earl Ludlow | Comptroller of the Household |
| 25 May 1782 | Castle Rising | u | John Chetwynd Talbot | Sir James Erskine | Succeeded to a peerage |
| 3 June 1782 | Oxford | u* | Lord Robert Spencer | Lord Robert Spencer | Vice-Treasurer of Ireland |
| 5 June 1782 | Portsmouth | u* | Robert Monckton | Sir Henry Fetherstonhaugh | Death |
| 6 June 1782 | Kingston upon Hull | u | Lord Robert Manners | David Hartley | Death |
| 12 June 1782 | Cricklade | c | John Macpherson | George St John | Void Election |
| 12 June 1782 | Westminster | u | Sir George Brydges Rodney | Sir Cecil Wray | Elevated to the peerage |
| 20 June 1782 | Cambridgeshire | u* | Lord Robert Manners | Sir Henry Peyton | Death |
| 8 July 1782 | New Romney | u | Richard Jackson | Richard Jackson | Junior Lord of the Treasury |
| 15 July 1782 | Wallingford | u* | John Aubrey | John Aubrey | Lord of the Admiralty |
| 16 July 1782 | Honiton | u* | Sir George Yonge | Sir George Yonge | Secretary at War |
| 18 July 1782 | Whitchurch | u | Thomas Townshend | Thomas Townshend | Home Secretary |
| 19 July 1782 | Bath | u* | John Jeffreys Pratt | John Jeffreys Pratt | Lord of the Admiralty |
| 19 July 1782 | Calne | u* | Isaac Barré | Isaac Barré | Paymaster of the Forces |
| 22 July 1782 | St Germans | u* | Edward James Eliot | Edward James Eliot | Junior Lord of the Treasury |
| 5 August 1782 | Appleby | u* | William Pitt the Younger | William Pitt the Younger | Chancellor of the Exchequer |
| 31 August 1782 | Wells | c | Robert Child | John Curtis | Death |
| 7 September 1782 | Wigan | u* | Henry Simpson Bridgeman | John Cotes | Death |
| 9 September 1782 | Gatton | u* | Robert Mayne | Maurice Lloyd | Death |
| 16 September 1782 | Newtown | u | Edward Meux Worsley | Henry Dundas | Death |
| 24 September 1782 | Southwark | c* | Nathaniel Polhill | Henry Thornton | Death |
| 13 December 1782 | Penryn | u | John Rogers | Reginald Pole Carew | Resignation (Agent to the Regiment of Militia in Somerset) |
| 18 December 1782 | Oxfordshire | u* | Lord Charles Spencer | Lord Charles Spencer | Vice-Treasurer of Ireland |
| 21 December 1782 | Abingdon | u | John Mayor | Henry Howorth | Resignation |
| 2 January 1783 | Edinburghshire | u* | Henry Dundas | Henry Dundas | Treasurer of the Navy |
| 17 January 1783 | Newtown | u* | Henry Dundas | Richard Pepper Arden | Resignation to contest Edinburghshire |
| 18 January 1783 | Coventry | u | Edward Roe Yeo | William Seymour Conway | Death |
| 21 January 1783 | Anstruther Burghs | u* | Sir John Anstruther | John Anstruther | Resignation |
| 27 January 1783 | Lincoln | u* | Sir Thomas Clarges | John Fenton Cawthorne | Death |
| 28 January 1783 | Newark-on-Trent | u* | Lord George Manners Sutton | John Manners Sutton | Death |
| 31 January 1783 | Launceston | u | Thomas Bowlby | Sir John Jervis | Resignation |
| 17 February 1783 | Pontefract | c(*) | The Viscount Galway | Nathaniel Smith | Resignation |
| 17 February 1783 | Pontefract | c(*) | Nathaniel Smith | John Smyth | By-election results reversed 11 April 1783 |
| 28 February 1783 | Chippenham | u* | Giles Hudson | George Fludyer | Death |
| 11 March 1783 | Minehead | u* | Francis Fownes Luttrell | Henry Beaufoy | Resignation |
| 17 March 1783 | Whitchurch | u* | Thomas Townshend | William Selwyn | Elevated to the peerage |
| 20 March 1783 | Peeblesshire | u | Alexander Murray | Alexander Murray | Resignation (Lord of Session) |
| 29 March 1783 | Westbury | u* | Samuel Estwick | Samuel Estwick | Secretary and Registrar of Chelsea Hospital |
| 6 April 1783 | Thetford | u | Richard Hopkins | Richard Hopkins | Lord of the Admiralty |
| 7 April 1783 | Westminster | u* | Charles James Fox | Charles James Fox | Foreign Secretary |
| 8 April 1783 | York | u | Lord John Cavendish | Lord John Cavendish | Chancellor of the Exchequer |
| 9 April 1783 | Banbury | u* | Lord North | Lord North | Home Secretary |
| 9 April 1783 | New Woodstock | u | William Eden | William Eden | Vice-Treasurer of Ireland |
| 9 April 1783 | Great Yarmouth | u | Charles Townshend | Charles Townshend | Treasurer of the Navy |
| 10 April 1783 | Higham Ferrers | u* | Frederick Montagu | Frederick Montagu | Junior Lord of the Treasury |
| 11 April 1783 | Cambridge University | u | John Townshend | John Townshend | Lord of the Admiralty |
| 11 April 1783 | Malton | u* | Edmund Burke | Edmund Burke | Paymaster of the Forces |
| 12 April 1783 | Saltash | c | Sir Grey Cooper | Sir Grey Cooper | Junior Lord of the Treasury |
| 14 April 1783 | Carlisle | u* | Earl of Surrey | Earl of Surrey | Junior Lord of the Treasury |
| 15 April 1783 | Knaresborough | u* | Viscount Duncannon | Viscount Duncannon | Lord of the Admiralty |
| 15 April 1783 | Warwick | u* | Charles Francis Greville | Charles Francis Greville | Treasurer of the Household |
| 16 April 1783 | Petersfield | u* | William Jolliffe | William Jolliffe | Lord of the Admiralty |
| 16 April 1783 | Montgomery | u | Whitshed Keene | Whitshed Keene | Lord of the Admiralty |
| 17 April 1783 | Bishop's Castle | u* | Henry Strachey | Henry Strachey | Clerk of the Deliveries of the Ordnance |
| 18 April 1783 | Tavistock | u* | Richard FitzPatrick | Richard FitzPatrick | Secretary at War |
| 22 April 1783 | Horsham | u | James Wallace | James Wallace | Attorney General for England and Wales |
| 23 April 1783 | Clitheroe | u* | John Lee | John Lee | Solicitor General for England and Wales |
| 25 April 1783 | Okehampton | u(*) | Humphrey Minchin | Humphrey Minchin | Clerk of the Ordnance |
| 28 April 1783 | Gloucestershire | u* | Sir William Guise | George Cranfield Berkeley | Death |
| 29 April 1783 | Tamworth | u* | John Courtenay | John Courtenay | Surveyor-General of the Ordnance |
| 2 May 1783 | Wigan | u | Horatio Walpole | Horatio Walpole | Secretary and Registrar of Chelsea Hospital |
| 3 May 1783 | East Grinstead | u* | John Irwin | George Medley | Resignation |
| 9 May 1783 | Ludlow | u | Frederick Cornewall | Somerset Davies | Death |
| 9 May 1783 | Wigtown Burghs | u | William Adam | William Adam | Treasurer of the Ordnance |
| 19 May 1783 | Abingdon | u* | Henry Howorth | Edward Loveden Loveden | Death |
| 24 May 1783 | Huntingdonshire | u* | Viscount Hinchingbrooke | Viscount Hinchingbrooke | Master of the Buckhounds |
| 30 May 1783 | Newton | u* | Thomas Peter Legh | Thomas Peter Legh | Accepted a Commission in the Army |
| 16 June 1783 | Weobley | u* | John St Leger Douglas | John Scott | Death |
| 8 July 1783 | Truro | u | Henry Rosewarne | John Pollexfen Bastard | Death |
| 12 July 1783 | Great Marlow | u* | William Clayton | William Clayton | Death |
| 15 July 1783 | Cirencester | u* | James Whitshed | Lord Apsley | Resignation |
| 28 July 1783 | Portsmouth | u* | William Gordon | Thomas Erskine | Resignation (Granted a Pension) |
| 7 August 1783 | Dunbartonshire | u* | George Keith Elphinstone | George Keith Elphinstone | Secretary, Chamberlain and Keeper of the Signet of the Principality of Scotland |
| 21 August 1783 | Renfrewshire | u* | John Shaw Stewart | William McDowall | Resignation |
| 17 October 1783 | Winchester | u | Lovell Stanhope | Henry Flood | Death |
| 17 November 1783 | York | u* | Sir Charles Turner | The Viscount Galway | Death |
| 19 November 1783 | Surrey | u | Viscount Althorp | Sir Robert Clayton | Succeeded to a peerage |
| 23 November 1783 | Bletchingley | u* | Sir Robert Clayton | Sir John Nicholls | Resignation to contest Surrey |
| 26 November 1783 | Cambridge University | u | James Mansfield | James Mansfield | Solicitor General for England and Wales |
| 26 November 1783 | Clitheroe | u* | John Lee | John Lee | Attorney General for England and Wales |
| 28 November 1783 | Horsham | u | James Wallace | James Craufurd | Death |
| 1 December 1783 | East Looe | u | William Graves | John James Hamilton | Resignation |
| 15 December 1783 | Hedon | u | Christopher Atkinson | Stephen Lushington | Expulsion for perjury |
| 29 December 1783 | St Albans | u | John Radcliffe | The Viscount Grimston | Death |
| 30 December 1783 | Honiton | u* | Sir George Yonge | Sir George Yonge | Secretary at War |
| 30 December 1783 | Wallingford | u | John Aubrey | John Aubrey | Junior Lord of the Treasury |
| 31 December 1783 | Cirencester | u* | Lord Apsley | Lord Apsley | Lord of the Admiralty |
| 31 December 1783 | Dartmouth | u | Charles Brett | Charles Brett | Lord of the Admiralty |
| 31 December 1783 | Hindon | c | Lloyd Kenyon | Lloyd Kenyon | Attorney General for England and Wales |
| 1 January 1784 | Yorkshire | u | Sir George Savile | Francis Ferrand Foljambe | Resignation |
| 3 January 1784 | Appleby | u | William Pitt the Younger | William Pitt the Younger | First Lord of the Treasury and Chancellor of the Exchequer |
| 3 January 1784 | Launceston | u* | Charles George Perceval | Charles George Perceval | Lord of the Admiralty |
| 3 January 1784 | East Looe | u* | John Buller | John Buller | Junior Lord of the Treasury |
| 3 January 1784 | West Looe | u | Sir William James | John Buller | Death |
| 3 January 1784 | Ludgershall | u* | George Augustus Selwyn | George Augustus Selwyn | Surveyor General of the Land Revenues of the Crown |
| 3 January 1784 | St Germans | u | Edward James Eliot | Edward James Eliot | Junior Lord of the Treasury |
| 3 January 1784 | Westbury | u* | Samuel Estwick | Samuel Estwick | Secretary and Registrar of Chelsea Hospital |
| 5 January 1784 | Bath | u* | John Jeffreys Pratt | John Jeffreys Pratt | Lord of the Admiralty |
| 5 January 1784 | Buckingham | u | William Wyndham Grenville | William Wyndham Grenville | Paymaster of the Forces |
| 5 January 1784 | Richmond | u | Marquess of Graham | Marquess of Graham | Junior Lord of the Treasury |
| 6 January 1784 | Newtown | u | Richard Pepper Arden | Richard Pepper Arden | Solicitor General for England and Wales |
| 6 January 1784 | Old Sarum | u* | Thomas Pitt | John Charles Villiers | Elevated to the peerage |
| 8 January 1784 | Edinburghshire | u* | Henry Dundas | Henry Dundas | Treasurer of the Navy |
| 20 January 1784 | Aldborough | u* | Charles Mellish | John Gally Knight | Resignation |
| 26 January 1784 | City of London | c* | Frederick Bull | Brook Watson | Death |
| 6 February 1784 | Truro | c | John Pollexfen Bastard | Sir John St Aubyn | Resignation |
| 14 February 1784 | Leicester | u | John Darker | Shukburgh Ashby | Death |
| 25 February 1784 | Cornwall | u* | Edward Eliot | Sir William Molesworth | Elevated to the peerage |
| 11 March 1784 | Old Sarum | u* | Pinckney Wilkinson | George Hardinge | Death |

### 16th Parliament (1784–1790)

| Date | Constituency | c/u | Former Incumbent | Winner | Cause |
| 14 June 1784 | Kingston upon Hull | u | William Wilberforce | Walter Spencer Stanhope | Chose to sit for Yorkshire |
| 14 June 1784 | Arundel | u | Earl of Surrey | Richard Beckford | Chose to sit for Carlisle |
| 14 June 1784 | New Romney | u | John Smith | Richard Atkinson | Resignation |
| 19 June 1784 | Minehead | u | Henry Beaufoy | Charles Phipps | Chose to sit for Great Yarmouth |
| 19 June 1784 | St Mawes | u* | The Earl Nugent | William Young | Resignation |
| 21 June 1784 | Midhurst | u | Benjamin Lethieullier | Edward Cotsford | Chose to sit for Andover |
| 25 June 1784 | Ipswich | c* | John Cator | Charles Alexander Crickitt | Void Election |
| 25 June 1784 | Southwark | c* | Sir Barnard Turner | Paul le Mesurier | Death |
| 1 July 1784 | Monmouthshire | u | John Hanbury | Viscount Nevill | Death |
| 4 July 1784 | Camelford | u* | Jonathan Phillips | Sir Samuel Hannay | Resignation |
| 12 July 1784 | Hereford | c | Earl of Surrey | Robert Philipps | Chose to sit for Carlisle |
| 14 July 1784 | Colchester | c | Christopher Potter | Sir Robert Smyth | Void Election |
| 26 July 1784 | Downton | c | Edward Bouverie | Edward Bouverie | Due to a Double Return four MPs were elected at the general election. Robert Shafto was declared elected and a by-election was held for the second seat where a Double Return occurred. |
| 26 July 1784 | Downton | c | Henry Seymour Conway | William Seymour Conway | Due to a Double Return four MPs were elected at the general election. Robert Shafto was declared elected and a by-election was held for the second seat where a Double Return occurred. |
| 26 July 1784 | Downton | c | William Scott | William Seymour Conway | Due to a Double Return four MPs were elected at the general election. Robert Shafto was declared elected and a by-election was held for the second seat where a Double Return occurred. |
| 26 July 1784 | Downton | c | William Seymour Conway | William Seymour Conway | Seymour Conway declared elected 11 March 1785 |
| 26 July 1784 | Downton | c | Edward Bouverie | William Seymour Conway | Seymour Conway declared elected 11 March 1785 |
| 10 August 1784 | Malton | u* | Sir Thomas Gascoigne | William Weddell | Resignation |
| 11 August 1784 | Andover | u* | Sir John Griffin Griffin | William Fellowes | Succeeded to a peerage |
| 16 August 1784 | Plympton Erle | u | Paul Treby Ourry | John Pardoe | Resignation |
| 21 August 1784 | West Looe | u | John Lemon | James Adams | Resignation |
| 28 August 1784 | Chipping Wycombe | u | Robert Waller | Robert Waller | Groom of the Bedchamber |
| 30 August 1784 | Newtown | u | James Worsley | Mark Gregory | Resignation |
| 31 August 1784 | Edinburgh | u | James Hunter Blair | Sir Adam Fergusson | Resignation |
| 31 August 1784 | Marlborough | u* | The Earl of Courtown | The Earl of Courtown | Treasurer of the Household |
| 17 September 1784 | Wigtownshire | u* | Keith Stewart | Andrew McDouall | Resignation (Receiver of Land Taxation for Scotland) |
| 29 October 1784 | Shrewsbury | u* | Sir Charlton Leighton | John Hill | Death |
| 11 January 1785 | Thirsk | u* | Sir Thomas Frankland | Robert Vyner | Death |
| 31 January 1785 | Stockbridge | u* | John Luttrell | James Gordon | Resignation (Commissioner of Excise) |
| 2 February 1785 | Wilton | u | Lord Herbert | Philip Goldsworthy | Resignation (Vice-Chamberlain of the Household) |
| 8 February 1785 | Ilchester | c | Peregrine Cust | John Harcourt | Death |
| 8 February 1785 | Ilchester | c | John Harcourt | George Johnstone | By-election results reversed on petition 22 February 1786 |
| 22 February 1785 | Morpeth | u* | Sir James St Clair Erskine | Sir James St Clair Erskine | Accepts a beneficial interest in the Office of Director of Chancery in Scotland |
| 29 March 1785 | Seaford | c | Henry Nevill | Sir John Henderson | Void Election |
| 29 March 1785 | Seaford | c* | Sir Peter Parker | Sir Peter Parker | Void Election |
| 11 April 1785 | Hereford | u* | Robert Philipps | James Walwyn | Resignation |
| 7 May 1785 | Cirencester | u(*) | Samuel Blackwell | Richard Master | Death |
| 12 May 1785 | Dumfriesshire | u* | Sir Robert Laurie | Sir Robert Laurie | Knight Marischal |
| 7 June 1785 | New Romney | u | Richard Atkinson | John Henniker | Death |
| 21 July 1785 | Bridgwater | u | Anne Poulett | Robert Thornton | Death |
| 25 July 1785 | Beaumaris | u* | Hugh Fortescue | Sir Hugh Williams | Succeeded to a peerage |
| 9 August 1785 | Steyning | u | Sir John Honywood | Thomas Edwards Freeman | Resignation |
| 9 August 1785 | Wenlock | u | John Simpson | George Forester | Resignation |
| 28 November 1785 | Monmouthshire | u* | Viscount Nevill | James Rooke | Succeeded to a peerage |
| 13 December 1785 | Newport (Cornwall) | u | Sir John Coghill | William Mitford | Death |
| 22 December 1785 | Nairnshire | u | Alexander Campbell | Alexander Brodie | Death |
| 3 February 1786 | Westbury | u | Chaloner Arcedeckne | John Madocks | Resignation |
| 6 February 1786 | Haverfordwest | u* | The Lord Milford | The Lord Kensington | Resignation to contest Pembrokeshire |
| 6 February 1786 | Liskeard | u* | Edward James Eliot | Edward James Eliot | King's Remembrancer |
| 7 February 1786 | Richmond | u | Charles Dundas | Sir Grey Cooper | Resignation |
| 9 February 1786 | Pembrokeshire | u* | Sir Hugh Owen | The Lord Milford | Death |
| 13 February 1786 | Fowey | u(*) | John Grant | Richard Edgcumbe | Resignation |
| 28 February 1786 | Aberdeenshire | c | Alexander Garden | George Skene | Death |
| 28 February 1786 | Peterborough | u* | James Farrel Phipps | Lionel Damer | Death |
| 3 March 1786 | East Grinstead | u | Henry Arthur Herbert | James Cuninghame | Resignation |
| 15 March 1786 | Tain Burghs | c | Charles James Fox | George Ross | Chose to sit for Westminster |
| 15 March 1786 | Chipping Wycombe | u* | Viscount Mahon | Earl Wycombe | Succeeded to a peerage |
| 21 March 1786 | Seaford | c | Sir John Henderson | Sir John Henderson | Void Election |
| 21 March 1786 | Seaford | c | Sir Peter Parker | Sir Peter Parker | Void Election |
| 21 March 1786 | Seaford | c | Sir John Henderson | Henry Flood | By-election results reversed on petition 26 April 1786 |
| 21 March 1786 | Seaford | c | Sir Peter Parker | Sir Godfrey Webster | By-election results reversed on petition 26 April 1786 |
| 27 March 1786 | Weymouth and Melcombe Regis | u | Gabriel Steward | George Jackson | Resignation |
| 31 March 1786 | Lancaster | c* | Francis Reynolds | Sir George Warren | Succeeded to a peerage |
| 1 April 1786 | Helston | u | John Rogers | Roger Wilbraham | Resignation |
| 10 April 1786 | Carlisle | c | Edward Norton | John Lowther | Death |
| 10 April 1786 | Carlisle | c | John Lowther | John Christian | By-election results reversed on petition 31 May 1786 |
| 10 April 1786 | Newport (I.o.W.) | u | Hugh Seymour Conway | John Thomas Townshend | Resignation |
| 10 April 1786 | Newton | u* | Thomas Davenport | Thomas Brooke | Death |
| 14 April 1786 | Selkirkshire | u* | John Pringle | Mark Pringle | Resignation |
| 22 April 1786 | Weobley | u* | Andrew Bayntun Rolt | Thomas Thynne | Resignation |
| 4 May 1786 | Bossiney | u | Bamber Gascoyne | Matthew Montagu | Resignation (Receiver General of Customs) |
| 24 May 1786 | East Looe | u | William Graves | Alexander Irvine | Resignation |
| 13 June 1786 | Haslemere | u | Thomas Postlethwaite | John Lowther | Resignation |
| 30 June 1786 | Tain Burghs | c* | George Ross | Charles Ross | Death |
| 5 July 1786 | Shaftesbury | u | Adam Drummond | John Drummond | Death |
| 6 July 1786 | Northumberland | u* | Lord Algernon Percy | Charles Grey | Succeeded to a peerage |
| 15 July 1786 | Wareham | u | Charles Lefebure | John Calcraft | Resignation |
| 24 July 1786 | Haddingtonshire | u* | Hew Dalrymple | John Hamilton | Resignation (Auditor of the Excise in Scotland) |
| 16 August 1786 | Kirkcudbrightshire | u* | Peter Johnston | Alexander Stewart | Resignation |
| 4 September 1786 | East Looe | u | John Buller | Richard Grosvenor | Death |
| 16 September 1786 | Norwich | c* | Sir Harbord Harbord | Henry Hobart | Elevated to the peerage |
| 21 September 1786 | Berwick-upon-Tweed | c | The Lord Delaval | Sir Gilbert Elliot | Became a British Peer |
| 19 October 1786 | Renfrewshire | c* | William MacDowall | John Shaw Stewart | Resignation |
| 30 October 1786 | Saltash | c | Charles Jenkinson | The Earl of Mornington | Elevated to the peerage |
| 30 October 1786 | Saltash | c | The Earl of Mornington | John Lemon | By-election results reversed on petition 7 May 1787 |
| 6 November 1786 | Cockermouth | u | John Lowther | Humphrey Senhouse | Resignation to contest Carlisle |
| 29 November 1786 | Carlisle | c(*) | Earl of Surrey | Edward Knubley | Succeeded to a peerage |
| 29 November 1786 | Carlisle | c | Edward Knubley | Rowland Stephenson | By-election results reversed on petition 26 February 1787 |
| 15 December 1786 | Minehead | u | Charles Phipps | Robert Wood | Death |
| 27 January 1787 | Helston | u(*) | Lord Hyde | James Bland Burges | Succeeded to a peerage |
| 29 January 1787 | Milborne Port | u | John Townson | William Popham | Resignation |
| 29 January 1787 | New Romney | u* | Sir Edward Dering | Richard Joseph Sullivan | Resignation |
| 1 February 1787 | Bere Alston | u | The Earl of Mornington | Charles Rainsford | Junior Lord of the Treasury |
| 5 February 1787 | Bury St Edmunds | u* | George Ferdinand FitzRoy | Lord Charles FitzRoy | Resignation |
| 9 February 1787 | Petersfield | u | Thomas Samuel Jolliffe | The Viscount Downe | Resignation |
| 19 February 1787 | Maldon | c | The Lord Waltham | Sir Peter Parker | Death |
| 23 February 1787 | Old Sarum | u* | John Charles Villiers | John Charles Villiers | Comptroller of the Household |
| 24 February 1787 | Ilchester | u | George Johnstone | George Sumner | Resignation |
| 26 February 1787 | Gatton | u | Maurice Lloyd | James Fraser | Resignation |
| 6 March 1787 | Truro | u* | William Macarmick | John Hiley Addington | Resignation (Lieutenant-Governor of Cape Breton Island) |
| 9 March 1787 | Durham City | u* | John Lambton | William Henry Lambton | Resignation |
| 12 March 1787 | Ashburton | u* | Robert Palk | Lawrence Palk | Resignation |
| 28 March 1787 | Norwich | c* | Henry Hobart | Henry Hobart | Void Election |
| 11 April 1787 | Yarmouth | u* | Edward Morant | Thomas Clarke Jervoise | Resignation |
| 9 May 1787 | Huntingdon | u* | Lancelot Brown | John Willett Payne | Resignation |
| 15 May 1787 | Staffordshire | u* | Sir John Wrottesley | Earl Gower | Death |
| 4 June 1787 | Reigate | u | Edward Leeds | Reginald Pole Carew | Resignation |
| 20 June 1787 | Breconshire | u* | Charles Morgan | Sir Charles Gould | Death |
| 22 June 1787 | Haddington Burghs | u | Francis Charteris | William Fullarton | Became the Eldest of a Scottish Peer |
| 6 July 1787 | Fifeshire | u* | Robert Skene | William Wemyss | Death |
| 17 July 1787 | Argyllshire | u* | Lord Frederick Campbell | Lord Frederick Campbell | Resignation pending appointment as Vice-Treasurer of Ireland |
| 19 July 1787 | New Windsor | u* | Lord Montagu | The Earl of Mornington | Death |
| 1 August 1787 | Sutherland | u* | William Wemyss | James Grant | Resignation to contest Fifeshire |
| 20 August 1787 | Calne | u* | James Townsend | Joseph Jekyll | Death |
| 5 October 1787 | Dartmouth | u* | Arthur Holdsworth | Edmund Bastard | Death |
| 4 December 1787 | Old Sarum | u* | George Hardinge | George Hardinge | Chief Justice of Breconshire |
| 6 December 1787 | Brecon | u* | Charles Morgan | Charles Gould | Resignation to contest Breconshire |
| 20 December 1787 | Bletchingley | u* | John Nicholls | Sir Robert Clayton | Resignation |
| 21 December 1787 | Ripon | u | Frederick Robinson | Sir John Goodricke | Resignation (Granted a pension) |
| 26 December 1787 | Harwich | u* | John Robinson | John Robinson | Surveyor General of Woods, Forests, Parks, and Chases |
| 8 February 1788 | Totnes | u | Sir Philip Jennings Clerke | Viscount Barnard | Death |
| 9 February 1788 | Wilton | u* | Philip Goldsworthy | Lord Herbert | Resignation |
| 1 April 1788 | Monmouth | u* | Sir John Stepney | Marquess of Worcester | Resignation |
| 17 April 1788 | Steyning | u | Thomas Edwards Freeman | Sir John Honywood | Death |
| 22 April 1788 | East Looe | u* | Richard Grosvenor | Viscount Belgrave | Resignation |
| 24 April 1788 | Tavistock | u | Richard Rigby | Lord John Russell | Death |
| 20 May 1788 | Denbigh Boroughs | u* | Richard Myddelton | Richard Myddelton | Resignation |
| 29 May 1788 | Cambridge | u* | John Mortlock | Francis Dickins | Resignation |
| 16 June 1788 | Tregony | u | Sir Lloyd Kenyon | Hugh Seymour Conway | Elevated to the peerage |
| 18 June 1788 | Launceston | u | George Rose | Sir John Swinburne | Clerk of the Parliaments |
| 19 June 1788 | Kincardineshire | u* | Lord Adam Gordon | Robert Barclay Allardice | Resignation |
| 25 June 1788 | Aldborough | u | Richard Pepper Arden | Richard Pepper Arden | Master of the Rolls |
| 1 July 1788 | Lymington | u | Harry Burrard | George Rose | Resignation |
| 1 July 1788 | New Windsor | u* | Peniston Portlock Powney | Peniston Portlock Powney | Ranger of Windsor Little Park |
| 4 July 1788 | Newcastle-under-Lyme | u* | Archibald Macdonald | Sir Archibald Macdonald | Attorney General for England and Wales |
| 7 July 1788 | Weobley | u* | Sir John Scott | Sir John Scott | Solicitor General for England and Wales |
| 9 July 1788 | New Woodstock | u | Francis Burton | Francis Burton | Second Justice of Chester |
| 12 July 1788 | Hindon | u | Edward Bearcroft | Edward Bearcroft | Chief Justice of Chester |
| 14 July 1788 | Maidstone | c* | Gerard Edwards | Matthew Bloxham | Resignation to contest Rutland |
| 15 July 1788 | Rutland | u* | Thomas Noel | Gerard Edwards | Death |
| 4 August 1788 | Westminster | c | The Lord Hood | Lord John Townshend | Naval Lord |
| 3 September 1788 | St Germans | u | Abel Smith | Samuel Smith | Death |
| 8 October 1788 | East Grinstead | u | James Cuninghame | Robert Cuninghame | Death |
| 23 October 1788 | Christchurch | u* | James Harris | Hans Sloane | Elevated to the peerage |
| 29 November 1788 | Clackmannanshire | u | Charles Allan Cathcart | Burnet Abercromby | Death |
| 15 December 1788 | Bramber | u | Daniel Pulteney | Robert Hobart | Resignation (Collector of Customs in Dominica) |
| 15 December 1788 | Colchester | c(*) | Sir Edmund Affleck | George Tierney | Death (Two MPs elected due to a Double Return) |
| 15 December 1788 | Colchester | c(*) | Sir Edmund Affleck | George Jackson | Death (Two MPs elected due to a Double Return) |
| 15 December 1788 | Colchester | c(*) | George Tierney | George Tierney | Tierney declared elected 6 April 1789 |
| 15 December 1788 | Colchester | c(*) | George Jackson | George Tierney | Tierney declared elected 6 April 1789 |
| 19 December 1788 | Wiltshire | u* | Charles Penruddocke | Sir James Tylney Long | Death |
| 23 December 1788 | Bere Alston | u* | Charles Rainsford | John Mitford | Resignation |
| 23 December 1788 | Devizes | u* | Sir James Tylney Long | Joshua Smith | Resignation to contest Wiltshire |
| 27 December 1788 | Weymouth and Melcombe Regis | u | George Jackson | Gabriel Steward | Resignation to contest Colchester |
| 13 January 1789 | Rye | u* | Charles Wolfran Cornwall | Charles Long | Death |
| 14 January 1789 | Dover | c* | James Luttrell | John Trevanion | Death |
| 19 January 1789 | Surrey | u* | William Norton | Lord William Russell | Succeeded to a peerage |
| 22 January 1789 | Banffshire | u | Sir James Duff | James Ferguson | Resignation |
| 5 February 1789 | Gloucester | c* | Sir Charles Barrow | John Pitt | Death |
| 16 February 1789 | Aylesbury | c* | Sir Thomas Hallifax | Scrope Bernard | Death |
| 27 February 1789 | East Grinstead | u | Robert Cuninghame | Richard Ford | Resignation |
| 4 March 1789 | Worcester | u* | William Ward | Edmund Wigley | Succeeded to a peerage |
| 8 April 1789 | Gloucestershire | u* | George Cranfield Berkeley | George Cranfield Berkeley | Surveyor-General of the Ordnance |
| 11 May 1789 | Cambridge | u* | James Whorwood Adeane | Edward Finch | Groom of the Bedchamber |
| 19 May 1789 | Cambridgeshire | u* | Sir Henry Peyton | James Whorwood Adeane | Death |
| 19 June 1789 | Buckinghamshire | u* | William Wyndham Grenville | William Wyndham Grenville | Home Secretary |
| 4 July 1789 | Dorchester | u | William Ewer | Thomas Ewer | Death |
| 6 July 1789 | Brackley | u* | Timothy Caswall | Samuel Haynes | Resignation (Commissioner of Excise) |
| 29 July 1789 | Bere Alston | u* | John Mitford | John Mitford | Justice of Cardiganshire, Pembrokeshire and Carmarthenshire |
| 3 August 1789 | Ayrshire | u | Hugh Montgomerie | William MacDowall | Resignation (Inspector of Military Roads in Scotland) |
| 7 August 1789 | Bath | u* | Viscount Bayham | Viscount Bayham | Junior Lord of the Treasury |
| 7 August 1789 | Cirencester | u* | Lord Apsley | Lord Apsley | Junior Lord of the Treasury |
| 10 August 1789 | Great Bedwyn | u* | Marquess of Graham | Marquess of Graham | Joint Paymaster of the Forces |
| 18 August 1789 | Reigate | u | William Bellingham | The Lord Hood | Resignation (Victualling Commissioner) |
| 21 August 1789 | Stirling Burghs | u | James Campbell | Sir Archibald Campbell | Resignation |
| 24 August 1789 | East Looe | u | Viscount Belgrave | Viscount Belgrave | Resignation pending appointment as a Lord of the Admiralty |
| 28 August 1789 | Denbighshire | u* | Sir Watkin Williams Wynn | Robert Watkin Wynne | Death |
| 1 September 1789 | Ripon | u* | Sir John Goodricke | Sir George Allanson Winn | Death |
| 4 September 1789 | Glamorganshire | u* | Charles Edwin | Thomas Wyndham | Resignation |
| 14 September 1789 | Morpeth | u* | Peter Delmé | Francis Gregg | Death |
| 27 November 1789 | Bodmin | u | Thomas Hunt | George Wilbraham | Death |
| 5 December 1789 | Lichfield | u | George Anson | Thomas Anson | Death |
| 28 January 1790 | Newport (I.o.W.) | u | John Thomas Townshend | George Byng | Resignation (Lord of the Admiralty) |
| 30 January 1790 | Dorchester | u(*) | Thomas Ewer | Cropley Ashley | Death |
| 1 February 1790 | Malmesbury | u* | Viscount Maitland | Paul Benfield | Became a Scottish Peer |
| 1 February 1790 | Plymouth | u* | Robert Fanshawe | Alan Gardner | Resignation (Commissioner of the Navy) |
| 1 February 1790 | St Germans | u | John Hamilton | Sir Charles Hamilton | Succeeded to a peerage |
| 4 February 1790 | East Looe | u | Alexander Irvine | The Earl of Carysfort | Death |
| 26 February 1790 | Glasgow Burghs | c | Ilay Campbell | John Craufurd | Resignation (Lord President of the Court of Session) |
| 26 February 1790 | Tiverton | u* | Dudley Ryder | Dudley Ryder | Comptroller of the Household |
| 1 March 1790 | Old Sarum | u | John Charles Villiers | John Charles Villiers | Chief Justice in Eyre North of Trent |
| 20 March 1790 | Cricklade | u* | Robert Nicholas | Thomas Estcourt | Resignation (Commissioner of Excise) |
| 25 May 1790 | Cirencester | u* | Lord Apsley | Lord Apsley | Teller of the Receipt of the Exchequer |