A vacancy has occurred in the Caerphilly constituency of Senedd Cymru. In accordance with section 10(2) of the Government of Wales Act 2006 (c. 32), as saved by section 24(1) of the Senedd Cymru (Members and Elections) Act 2024 (asc 4), a by-election will be held to fill this constituency vacancy on 23 October 2025.