This is a list of Plaid Cymru MPs. It includes all members of Parliament elected to the British House of Commons representing Plaid Cymru. Members of the Senedd or the European Parliament are not listed.
| Name | Constituency | Served from | Served to | Term length | Days |
|---|---|---|---|---|---|
| Dafydd Wigley | Caernarfon | 28 February 1974 | 7 June 2001 | 27 years, 99 days | 9,961 |
| Hywel Williams | Caernarfon then Arfon | 8 June 2001 | 30 May 2024 | 22 years, 357 days | 8,392 |
| Elfyn Llwyd | Meirionnydd Nant Conwy then Dwyfor Meirionnydd | 9 April 1992 | 30 March 2015 | 22 years, 355 days | 8,390 |
| Dafydd Elis-Thomas | Meirionnydd then Meirionnydd Nant Conwy | 28 February 1974 | 9 April 1992 | 18 years, 41 days | 6,615 |
| Ieuan Wyn Jones | Ynys Môn | 11 June 1987 | 7 June 2001 | 13 years, 361 days | 5,110 |
| Jonathan Edwards | Carmarthen East and Dinefwr | 6 May 2010 | 22 May 2020 [n 1] | 10 years, 16 days | 3,669 |
| Liz Saville Roberts | Dwyfor Meirionnydd | 8 May 2015 | present | 9 years, 286 days | 3,574 |
| Adam Price | Carmarthen East and Dinefwr | 8 June 2001 | 12 April 2010 | 8 years, 308 days | 3,230 |
| Gwynfor Evans | Carmarthen | 14 July 1966 | 18 June 1970 | 8 years 5 months 27 days | 3,101 |
| 10 October 1974 | 3 May 1979 | ||||
| Cynog Dafis | Ceredigion and Pembroke North then Ceredigion | 9 April 1992 | 8 January 2000 | 7 years, 274 days | 2,830 |
| Ben Lake | Ceredigion | 9 June 2017 | present | 7 years, 254 days | 2,811 |
| Simon Thomas | Ceredigion | 3 February 2000 | 5 May 2005 | 5 years, 91 days | 1,918 |
| Ann Davies | Caerfyrddin | 4 July 2024 | present | 229 days | 229 |
| Llinos Medi | Ynys Môn | 4 July 2024 | present | 229 days | 229 |
Dates are taken from a House of Commons Library Briefing. [1] Following a rule change that came into force at the 2005 general election MPs who were defeated (eg Simon Thomas) are shown as serving up to and including the day of the election at which they were defeated. MPs who voluntarily stood down (eg Elfyn Llwyd) are shown as serving up until the day of dissolution of their final Parliament.
| Constituency | 1966 | 1970 | Feb 74 | Oct 74 | 1979 | 1987 | 1992 | 1997 | 2000 | 2001 | 2005 | 2010 | 2015 | 2017 | 2019 | 2020 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Carmarthen / Carmarthen East and Dinefwr / Caerfyrddin | Evans | Evans | Price | Edwards | Davies | ||||||||||||
| Caernarfon / Arfon | Wigley | Williams | |||||||||||||||
| Merionethshire / Meirionnydd Nant Conwy (1983-2010) / Dwyfor Meirionnydd | Elis Thomas | Llwyd | Saville-Roberts | ||||||||||||||
| Ynys Môn | Wyn Jones | Medi | |||||||||||||||
| Ceredigion & Pembroke North / Ceredigion / Ceredigion Preseli | Dafis | Thomas | Lake | ||||||||||||||
| No. of Plaid Cymru MPs | 1 | 0 | 2 | 3 | 2 | 3 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 4 | 4 | 3 | 4 |
