List of ministerial by-elections to the Parliament of the United Kingdom
s to the Parliament of the United Kingdom at Westminster were held from 1801 to the 1920s when a member of parliament was appointed as a minister in the government. Unlike most Westminster by-elections, ministerial by-elections were often a formality, uncontested by opposition parties. Re-election was required under the Succession to the Crown Act 1707. This was in line with the principle established in 1624 that accepting an office of profit from the Crown would precipitate resignation from the House, with the option of standing for re-election. Typically a minister sought re-election in the constituency he had just vacated, but occasionally contested another seat which was also vacant. In 1910 The Times newspaper noted that the relevant Act had been passed in the reign of Queen Anne "to prevent the Court from swamping the House of Commons with and pensioners", and described the process as "anomalous" and "indefensible" in the 20th century. The Re-Election of Ministers Act 1919 ended the necessity to seek re-election within nine months of a general election, and the Re-Election of Ministers Act Amendment Act 1926 ended the practice in all other cases.Ministerial by-elections
34th Parliament (1924–1929)
31st Parliament (1919–1922)
30th Parliament (August 1914 – 1918)
30th Parliament (December 1910 – July 1914)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position29th Parliament (January 1910 – December 1910)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position28th Parliament (1906 – January 1910)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position27th Parliament (1900–1906)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position26th Parliament (1895–1900)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position25th Parliament (1892–1895)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position24th Parliament (1886–1892)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position23rd Parliament (1885–1886)
!By-election !! Date !! Incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position22nd Parliament (1880–1885)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position21st Parliament (1874–1880)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position20th Parliament (1868–1874)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position19th Parliament (1865–1868)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position18th Parliament (1859–1865)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position17th Parliament (1857–1859)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position16th Parliament (1852–1857)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position15th Parliament (1847–1852)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position14th Parliament (1841–1847)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position13th Parliament (1837–1841)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position12th Parliament (1835–1837)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position11th Parliament (1832–1834)
!By-election !! Date !! Former incumbent !! colspan=2 | Party !! Winner !! colspan=2 | Party !! Position10th Parliament (1831–1832)
9th Parliament (1830–1831)
8th Parliament (1826–1830)
7th Parliament (1820–1826)
6th Parliament (1818–1820)
5th Parliament (1812–1818)
4th Parliament (1807–1812)
3rd Parliament (1806–1807)
2nd Parliament (1802–1806)
