List of by-elections to the Senedd

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 term By-election Date Incumbent Party Winner Party Cause Retained at next election
2021–2026 Caerphilly 23 October 2025 Hefin David Labour Lindsay Whittle Plaid Cymru Death (suicide)[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 Park[3] Yes
2003–2007 Blaenau Gwent 29 June 2006 Peter Law* Labour Trish Law Independent Death (brain tumour)[4] Yes
1999–2003 Swansea East 27 September 2001 Val Feld Labour Valerie Lloyd Labour Death (cancer)[5] Yes

*Law quit 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. ^ Glyn Jones, Teleri (26 August 2025). "Caerphilly politician Hefin David found dead at home - inquest". BBC News.
  2. ^ "Sacked Labour minister Carl Sargeant found dead". BBC News. 7 November 2017. Retrieved 12 July 2021.
  3. ^ "Ieuan Wyn Jones to stand down as AM to lead science park". BBC News. 18 June 2013. Retrieved 26 October 2025.
  4. ^ Press Association (25 April 2006). "MP Peter Law dies". The Guardian. Retrieved 26 October 2025.
  5. ^ Williams, Paul (10 August 2001). "Val Feld". The Guardian. Retrieved 26 October 2025.
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