The list of by-elections in the United Kingdom is divided chronologically by parliament:
Parliament of England List of English by-elections (1689–1700) List of English by-elections (1701–1707)
Parliament of Great Britain List of Great Britain by-elections (1707–1715) List of Great Britain by-elections (1715–1734) List of Great Britain by-elections (1734–1754) List of Great Britain by-elections (1754–1774) List of Great Britain by-elections (1774–1790) List of Great Britain by-elections (1790–1800)
Parliament of the United Kingdom List of United Kingdom by-elections (1801–1806) List of United Kingdom by-elections (1806–1818) List of United Kingdom by-elections (1818–1832) List of United Kingdom by-elections (1832–1847) List of United Kingdom by-elections (1847–1857) List of United Kingdom by-elections (1857–1868) List of United Kingdom by-elections (1868–1885) List of United Kingdom by-elections (1885–1900) List of United Kingdom by-elections (1900–1918) List of United Kingdom by-elections (1918–1931) List of United Kingdom by-elections (1931–1950) List of United Kingdom by-elections (1950–1979) List of United Kingdom by-elections (1979–2010) List of United Kingdom by-elections (2010–2024) List of United Kingdom by-elections (2024–present) By-elections to the House of Lords (hereditary peers)
Other parliaments List of by-elections to the Scottish Parliament List of by-elections to the Senedd List of European Parliament by-elections in the United Kingdom List of Northern Ireland Parliament by-elections (1921–1972) Northern Ireland Assembly vacancies are filled by co-option
Local government Local government by-election results are generally given on the page for the last election in that area, see :Category:Council elections in the United Kingdom
See also United Kingdom by-election records List of United Kingdom general elections :Category:By-elections in dependent territories of the United Kingdom