List of by-elections to the Senedd

Last updated

This is a list of by-elections to the Senedd (Welsh Parliament; Welsh : Senedd Cymru; formerly known as the National Assembly for Wales).

Where seats changed political party at the by-election, the result is highlighted.
Assembly termBy-electionDateIncumbentPartyWinnerPartyCauseRetained at next election
2021-2026 Caerphilly TBC 2025 Hefin David Labour TBCTBCDeath [1] N/A
2016–2021 Alyn and Deeside 6 February 2018 Carl Sargeant Labour Jack Sargeant Labour Death (suicide) [2] Yes
2011–2016 Ynys Môn 1 August 2013 Ieuan Wyn Jones Plaid Cymru Rhun ap Iorwerth Plaid Cymru Resignation to lead the Menai Science ParkYes
2003–2007 Blaenau Gwent 29 June 2006 Peter Law * Labour Trish Law Independent Death (brain tumour)Yes
1999–2003 Swansea East 27 September 2001 Val Feld Labour Valerie Lloyd Labour Death (cancer)Yes

*Peter Law left the Labour Party and sat as an independent prior to his death. The by-election was won by his widow, but is classed as an independent gain from Labour.

See also

References

  1. "Welsh Labour politician Hefin David dies, aged 47". BBC News. 13 August 2025. Retrieved 13 August 2025.
  2. "Sacked Labour minister Carl Sargeant found dead". BBC News. 7 November 2017. Retrieved 12 July 2021.