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) N/A
2016–2021 Alyn and Deeside 6 February 2018 Carl Sargeant Labour Jack Sargeant Labour Death (suicide) 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 Yes
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
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