Siân Gwenllian is a Welsh politician, who was elected to the Senedd in the 2016 election. She represents the constituency of Arfon as a member of Plaid Cymru, and holds the seat with a majority of 4,162 votes. Following the election, she was appointed Plaid Cymru's spokesperson for Local Government, the Welsh Language, Equalities and Planning. She is currently a member of the Culture, Welsh Language and Communications Committee and sits on the Equality, Local Government and Communities Committee in the Assembly.
|Deputy Leader of Plaid Cymru|
|Assumed office |
23 October 2018
Serving with Rhun ap Iorwerth
|Preceded by||Elin Jones (2016)|
|Member of the Senedd |
|Assumed office |
5 May 2016
|Preceded by||Alun Ffred Jones|
|Political party||Plaid Cymru|
|Alma mater||Aberystwyth University |
She previously served as a councillor on Gwynedd Council, representing Y Felinheli. Between 2010 and 2012 she was responsible for the authority's finance portfolio. Between 2012 and 2014 she was Cabinet Member for Education, lead on children and young people, and was deputy leader of the Council. In 2014, she was appointed Gwynedd Small Business Champion, responsible for promoting this sector of the economy in Gwynedd.
She was educated at Friars School, Bangor and at Aberystwyth and Cardiff universities. She was then a journalist with the BBC and HTV in Bangor before becoming a county councillor for Y Felinheli, the village where she was brought up.
In 2018, she became co-deputy leader of Plaid Cymru alongside fellow Ynys Môn AM Rhun ap Iorwerth. Upon her appointment by leader Adam Price, Siân Gwenllian stated that, "I'm proud to be a member of this group of talented and skilled individuals and look forward to working together as a collective as we move towards the project of building a New Wales". 
Siân was also appointed as an Assembly Commission Commissioner in November 2018. She is currently responsible for official languages and the delivery and transformation of services to Assembly Members.
- "Plaid Cymru hold Arfon for Sian Gwenllian". Daily Post, 6 May 2016.
- "Siân Gwenllian AM - Assembly Member Profile". www.assembly.wales. Retrieved 21 September 2016.
- "Shadow Cabinet". www.partyof.wales. Retrieved 21 September 2016.
- PoliticsHome.com (27 November 2018). "New appointments this week in UK politics, the civil service and public affairs". PoliticsHome.com. Retrieved 30 November 2018.
- "The Commissioners and their role". National Assembly for Wales. Retrieved 30 November 2018.