Gwynedd Maldwyn

Siân Gwenllian is one of six Senedd Members who represent Gwynedd Maldwyn, a new multi-member constituency used for the first time in the 2026 Senedd election. It covers western and southern Gwynedd, southern Denbighshire, northern Powys, and the south-west of Wrexham County Borough.
 
It is a pairing of the two UK Parliament constituencies Dwyfor Meirionnydd and Montgomeryshire and Glyndŵr. It has a Welsh-only name.
 
Following the 2026 Senedd election, the constituency is represented by Siân Gwenllian (Plaid Cymru), Mabon ap Gwynfor (Plaid Cymru), Beca Brown (Plaid Cymru), Elwyn Vaughan (Plaid Cymru), Andrew Griffin (Reform UK), Claire Johnson-Wood (Reform UK).