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Siân Gwenllian MS

Profile image for Siân Gwenllian MS

Party: Plaid Cymru

Constituency: Arfon

Contact information

Office Address: 
8 Castle Street
LL55 1SE

Phone:  01286 672076

Senedd Address: 
Welsh Parliament
Cardiff Bay
CF99 1SN

Phone:  0300 200 7192


Website (non-Assembly) :

Facebook :

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Term of Office

  • 06/05/2016 -

Membership of Cross Party Groups

Additional Information

Siân also has an office at 70 High Street, Bangor, LL57 1NR


Key interests and achievements

Siân Gwenllian was elected to the National Assembly in 2016. She represents the Arfon constituency as a member of Plaid Cymru.

Following the election Sian was appointed Plaid Cymru’s spokesperson for Local Government, the Welsh Language, Equalities and Planning.


Personal history

Sian was educated at Friars School, Bangor and at Aberystwyth and Cardiff Universities.

After losing her husband Sian brought up her four children on her own.

She has been a school governor for 15 years and until recently the Chair of Governors at Ysgol Syr Hugh Owen, Caernarfon. She is involved in community projects and campaigns for the Welsh language and gender equality.

Her interests outside politics include theatre, art, walking, yoga, the Welsh music scene, football and rugby.


Professional background

Sian worked as a journalist with the BBC and HTV before becoming a freelance journalist. More recently she worked as Gwynedd Council Communications Officer and for Golwg company.


Political history

Between 2008 and 2016 she served as a councillor on Gwynedd Council, representing Y Felinheli. Between 2010 and 2012 she was responsible for the authority's finance portfolio and between 2012 and 2014 she was Cabinet Member for Education, 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 has been Chair of the Plaid Cymru Arfon Constituency Committee


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