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Siân Gwenllian is a Member of the Senedd (MS) for Gwynedd Maldwyn. She previously represented the Arfon constituency between 2016 and 2026, having first been elected in 2016 and re-elected in 2021 with a higher percentage of the vote than any other candidate across Wales, doubling her majority with 63.3% of the vote.
In May 2026, she was re-elected to the Senedd as one of four successful Plaid Cymru candidates in Gwynedd Maldwyn under the new proportional representation electoral system. Following the 2026 Senedd election, in which Plaid Cymru emerged as the largest party, Siân Gwenllian was appointed Cabinet Minister for Local Government, Housing and Planning.
She is proud to have successfully campaigned for a new medical school for north Wales based in Bangor, in the area she represented for a decade.
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