Powys CC, Yscir with Honddu Isaf and Llanddew – 2 July 2026
Reform UK seat (elected as Conservative) Cause: Resignation
Liberal Democrat candidate: Colin Millichap
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Powys CC, Llanyre with Nantmel – 2 July 2026
Reform UK seat (elected as Independent) Cause: Resignation
Liberal Democrat candidate: Tim Wilson
Powys CC, Glantwymyn – 2 July 2026
Plaid Cymru seat. Cause: Resignation
Liberal Democrat candidate: Angela Standrin
Gwynedd Council, Llanrug – 9 July 2026
Plaid Cymru seat. Cause: Resignation
Lib Dem candidate: Linda Park
Neath Port Talbot Council, Trebanos – 9 July 2026
Plaid Cymru seat. Cause: Resignation
Lib Dem candidate: Hayley Davies
Cardiff City Council, Splott – 9 July 2026
Labour seat. Cause: Resignation
Lib Dem candidate: Rhys Husband
Vale of Glamorgan Council, Baruc – 9 July 2026
Plaid Cymru seat. Cause: Resignation
Lib Dem candidate: Gabriela Ferguson
Flintshire CC, Connah’s Quay Central – 9 July 2026
Independent seat. Cause: Resignation
No Lib Dem candidate
Flintshire CC, Argoed and New Brighton – 9 July 2026
Liberal Democrat seat. Cause: Death
Lib Dem candidate: Faron Hadfield-Jones
Pembrokeshire CC, Pembroke Dock Market – 9 July 2026
Independent seat. Cause: Death
Lib Dem candidate: Lee Herring
Isle of Angelsey Council, Bro’r Llynnoedd – 30 July 2026
Plaid Cymru seat. Cause: Death