Dwyfor Meirionnydd (UK Parliament constituency)

Dwyfor Meirionnydd  is a constituency of the House of Commons of the Parliament of the United Kingdom (at Westminster), held by Liz Saville Roberts of Plaid Cymru. The seat is bordered to the north by Bangor Abercony, to the south by Montgomeryshire and Glyndŵr, and to the east by Clwyd East. Until 2024, the seat shared the same boundaries with the Dwyfor Meirionnydd Welsh Assembly constituency, the latter of which still uses the borders established for the 2007 Welsh Assembly election.

Like its predecessors, it is a Plaid Cymru stronghold, with their candidate in 2024 achieving a majority of 39.3%.

History
Dwyfor Meirionnydd was created by the Welsh Boundary Commission for the 2010 general election, and replaced the old north Wales seat of Meirionnydd Nant Conwy.

At the 2023 Periodic Review of Westminster constituencies and under the June 2023 final recommendations of the Boundary Commission for Wales, the constituency retained its name and gained wards in boundary changes first used for the 2024 United Kingdom general election.

Boundaries
The constituency was created by merging most of Meirionnydd Nant Conwy with the southern part of Caernarfon; the northern area became part of a new Arfon constituency.

The seat is composed of the following electoral wards:

2010–2024: The Gwynedd wards of Aberdaron, Aberdyfi, Abererch, Abermaw, Abersoch, Bala, Botwnnog, Bowydd and Rhiw, Brithdir and Llanfachreth/Ganllwyd/Llanelltyd, Bryn-crug/Llanfihangel, Clynnog, Corris/Mawddwy, Criccieth, Diffwys and Maenofferen, Dolbenmaen, Dolgellau North, Dolgellau South, Dyffryn Ardudwy, Efail-newydd/Buan, Harlech, Llanaelhaearn, Llanbedr, Llanbedrog, Llandderfel, Llanengan, Llangelynin, Llanuwchllyn, Llanystumdwy, Morfa Nefyn, Nefyn, Penrhyndeudraeth, Porthmadog East, Porthmadog West, Porthmadog-Tremadog, Pwllheli North, Pwllheli South, Teigl, Trawsfynydd, Tudweiliog and Tywyn.

2024–present: As above, plus the Gwynedd wards of Bethel & Felinheli, Caernarfon Town Central, Clynnog, Cwm-y-Glo, Deiniolen, Hendre, Llanberis, Llanllyfni, Llanrug, Llanwanda, Menai, Peblig, Penygroes, Tryfan, Bontnewydd, and Groeslon, and the Denbighshire ward of Edeirnion.
 * ''The areas of Gwynedd were transferred in from the Arfon constituency, and Edeirnion from the Clwyd South constituency.