| By-election | Date | Former incumbent | Party | Winner | Party | Position |
| Derby |
4 September 1846 |
Edward Strutt |
| Whig |
Edward Strutt |
| Whig |
Resignation pending appointment as President of the Railway Commission |
| St. Albans |
11 August 1846 |
William Hare |
| Whig |
Benjamin Bond Cabbell |
| Conservative |
Lord-in-waiting |
| Chester |
8 August 1846 |
Lord Robert Grosvenor |
| Whig |
Lord Robert Grosvenor |
| Whig |
Treasurer of the Household |
| Sutherland |
28 July 1846 |
David Dundas |
| Whig |
David Dundas |
| Whig |
Solicitor General for England and Wales |
| Roscommon |
21 July 1846 |
Denis O'Conor |
| Repeal |
Denis O'Conor |
| Whig |
Junior Lord of the Treasury |
| West Riding of Yorkshire |
18 July 1846 |
George Howard |
| Whig |
George Howard |
| 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 |
Hugh Fortescue |
| Whig |
Hugh Fortescue |
| 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 |
Marcus Sandys |
| Whig |
Marcus Sandys |
| 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 |
Henry John Temple |
| Whig |
Henry John Temple |
| 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 Hobhouse |
| Whig |
John 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 |
| 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 |
| South Nottinghamshire |
27 February 1846 |
Henry Pelham-Clinton |
| Conservative |
Thomas Thoroton-Hildyard |
| Conservative |
Chief Secretary for Ireland |
| Westminster |
19 February 1846 |
Henry John Rous |
| Conservative |
De Lacy Evans |
| Whig |
Fourth Naval Lord |
| Buteshire |
7 February 1846 |
James Stuart-Wortley |
| Conservative |
James Stuart-Wortley |
| Conservative |
Judge Advocate General |
| Newark |
29 January 1846 |
William Ewart Gladstone |
| Conservative |
John Stuart |
| Conservative |
Secretary of State for War and the Colonies |
| 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 |
| 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 |
| 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 |
| Thetford |
24 February 1845 |
Bingham Baring |
| Conservative |
Bingham Baring |
| Conservative |
Paymaster General |
| 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 |
| Chichester |
27 May 1844 |
Lord Arthur Lennox |
| Conservative |
Lord Arthur Lennox |
| Conservative |
Junior Lord of the Treasury |
| Buckingham |
25 May 1844 |
Sir Thomas Fremantle |
| Conservative |
Sir Thomas Fremantle |
| Conservative |
Secretary at War |
| Woodstock |
22 April 1844 |
Frederic Thesiger |
| Conservative |
John Spencer-Churchill |
| Conservative |
Solicitor General for England and Wales |
| Exeter |
20 April 1844 |
William Webb Follett |
| Conservative |
William Webb Follett |
| Conservative |
Attorney General for England and Wales |
| Bandon |
14 February 1842 |
Joseph Devonsher Jackson |
| Conservative |
Francis Bernard |
| Conservative |
Solicitor-General for Ireland |
| Linlithgowshire |
20 October 1841 |
Charles Hope |
| Conservative |
Charles Hope |
| Conservative |
Commissioner of Greenwich Hospital |
| East Retford |
2 October 1841 |
Arthur Duncombe |
| Conservative |
Arthur Duncombe |
| Conservative |
Groom in Waiting in Ordinary |
| County 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 |
| 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 Lowry-Corry |
| Conservative |
Henry Lowry-Corry |
| Conservative |
Civil Lord of the Admiralty |
| Buteshire |
23 September 1841 |
William Rae |
| Conservative |
William Rae |
| Conservative |
Lord Advocate |
| East Cornwall |
22 September 1841 |
Lord Eliot |
| Conservative |
Lord Eliot |
| Conservative |
Chief Secretary for Ireland |
| 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 |
Henry Pelham-Clinton |
| Conservative |
Henry Pelham-Clinton |
| 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 |
| Cardiff Boroughs |
17 September 1841 |
John Iltyd Nicholl |
| Conservative |
John Iltyd Nicholl |
| Conservative |
Judge Advocate General |
| 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 |
| 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 |
| 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 |
| 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 |