List of parliamentary constituencies in Gwynedd

Three constituencies cover the preserved county of Gwynedd for the House of Commons of the UK Parliament (Westminster), and are used also for elections to the Senedd. The current boundaries have been effective since the 2007 National Assembly for Wales election and the 2010 United Kingdom general election.^{[1][n 1]}.

The preserved county of Gwynedd shares its name with the southern bulk, the principal area, Gwynedd, Anglesey (Welsh: Ynys Môn), forms a second principal area, i.e. has its own local government council.

For Senedd elections, the constituencies each elect one assembly member and are grouped into additional-member electoral regions, in this instance the region is North Wales.

Constituency	Boundaries
1. Arfon CC (Westminster)
2. Dwyfor Meirionnydd CC (Westminster)
3. Ynys Môn CC (Westminster)

  Plaid Cymru ₪   Conservative †   Labour ‡

Constituency	Boundaries
1. Caernarfon CC (Westminster)
2. Conwy CC (Westminster) (part)
3. Meirionnydd Nant Conwy CC (Westminster) (part)
4. Ynys Môn CC (Westminster)

The Boundary Commission for Wales submitted their final proposals in respect of the Sixth Periodic Review of Westminster Constituencies (the 2018 review) in September 2018. Although the proposals were immediately laid before Parliament they were not brought forward by the Government for approval. Accordingly, they did not come into effect for the 2019 election which took place on 12 December 2019, and which was contested using the constituency boundaries in place since 2010.

Under the terms of the Parliamentary Voting System and Constituencies Act 2011, the Sixth Review was based on reducing the total number of MPs from 650 to 600 and a strict electoral parity requirement that the electorate of all constituencies should be within a range of 5% either side of the electoral quota.

On 24 March 2020, the Minister of State for the Cabinet Office, Chloe Smith, issued a written statement to Parliament setting out the Government's thinking with regard to parliamentary boundaries. They propose to bring forward primary legislation to remove the statutory obligation to implement the 2018 Boundary Review recommendations, as well as set the framework for future boundary reviews in time for the next review which is due to begin in early 2021 and report no later than October 2023. It is proposed that the number of constituencies now remains at the current level of 650, rather than being reduced to 600, while retaining the requirement that the electorate should be no more than +/- 5% from the electoral quota.^[2]

Constituency	Senedd region	Constituency boundaries
1. Arfon CC (Senedd)	North Wales
2. Dwyfor Meirionnydd CC (Senedd)	Mid and West Wales
3. Ynys Môn CC (Senedd)	North Wales

The North Wales region also includes seven Clwyd constituencies. The Mid and West Wales region also includes five Dyfed constituencies and two Powys constituencies.

Constituency	Assembly region	Constituency boundaries
1. Caernarfon CC (Assembly)	North Wales
2. Conwy CC (Assembly) (part)
3. Meirionnydd Nant Conwy CC (Assembly) (part)	Mid and West Wales
4. Ynys Môn CC (Assembly)	North Wales

Before 1974/1983 this table covers the historic counties of Anglesey, Carnarvonshire and Merionethshire. A cell marked → (with a different colour background to the preceding cell) indicates that the previous MP continued to sit under a new party name.

  Conservative   Liberal   Peelite   Whig

  Conservative   Liberal

  Conservative   Liberal

  Coalition Liberal (1918–22) / National Liberal (1922–23)   Conservative   Independent Labour   Independent Liberals   Labour   Liberal

  Conservative   Labour   Liberal   Plaid Cymru

  Conservative   Labour   Plaid Cymru

¹In 2003 the area of the former Aberconwy district, largely identical to the Conway constituency, was moved from the preserved county of Gwynedd to the preserved county of Clwyd. This constituency is graphed with the Gwynedd constituencies until the reorganisation of constituency boundaries in 2010.

  Conservative   Labour   Plaid Cymru

¹parts transferred in 2024 to the constituency of Bangor Aberconwy which lies mostly in Clwyd

• List of parliamentary constituencies in Wales

References

Notes