List of Welsh Assembly by-elections

This is a list of by-elections to the National Assembly for Wales.

Where seats changed political party at the by-election, the result is highlighted: red for a Labour gain, green for a Plaid Cymru (PC) gain, blue for a Conservative gain, orange for a Liberal Democrat, and grey for any other gain.

Assembly 1999-2003

By-election Date Incumbent Party Winner Party Cause Retained at 2003 election
Swansea East September 27, 2001 Val Feld Labour Valerie Lloyd Labour Death (cancer) Yes

Assembly 2003-2007

By-election Date Incumbent Party Winner Party Cause Retained at 2007 election
Blaenau Gwent June 29, 2006 Peter Law Labour/Independent Trish Law Independent Death (brain tumour) Yes

Peter Law left the Labour Party and sat as an independent prior to his death. The by-election was won by his widow.

Assembly 2007-2011

No by-elections were held.

Assembly 2011-2016

By-election Date Incumbent Party Winner Party Cause Retained at 2016 election
Ynys Môn August 1, 2013 Ieuan Wyn Jones Plaid Cymru Rhun ap Iorwerth Plaid Cymru Resignation to lead the Menai Science Park TBD
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