2026 review of Senedd constituencies

The 2026 review of Senedd constituencies was conducted between July 2024 and March 2025 by the Democracy and Boundary Commission Cymru. The Senedd Cymru (Members and Elections) Act 2024 legislated that the 2026 Senedd election should use 16 six-member constituencies, replacing the existing 40 constituencies and five regions currently used for the Senedd (Welsh Parliament; Welsh: Senedd Cymru). The constituencies are required by the law to be contiguous pairings of the 32 UK Parliament constituencies used in Wales since the 2024 UK election. The commission were also required by the law to give constituencies a single name in both Welsh and English, unless it could be considered unacceptable for a single name. The commission announced they are to all use Welsh-only names.