Results for the UK general election on 7 May 2015 Elections contested by Plaid Cymru
A general election to the 56th Parliament of the United Kingdom with an electorate of 46,354,197, having 30,697,525 valid votes and 102,639 invalid votes.
Read the House of Commons Library briefing.
| Constituency | Candidate | Electorate | Turnout | Votes | Vote share | Vote change | Position |
| Carmarthen East and Dinefwr | EDWARDS, Jonathan | 55,750 | 70.7% | 15,140 | 38.4% | 2.8% | 1st |
| Dwyfor Meirionnydd | SAVILLE-ROBERTS, Liz | 44,394 | 65.1% | 11,811 | 40.9% | -3.5% | 1st |
| Arfon | WILLIAMS, Hywel | 40,492 | 66.3% | 11,790 | 43.9% | 8.0% | 1st |
| Ynys Môn | ROWLANDS, John | 49,939 | 69.9% | 10,642 | 30.5% | 4.3% | 2nd |
| Ceredigion | PARKER, Mike | 54,242 | 69.0% | 10,347 | 27.7% | -0.6% | 2nd |
| Llanelli | WILLIAMS, Vaughan | 59,314 | 65.0% | 8,853 | 23.0% | -7.0% | 2nd |
| Rhondda | REES-OWEN, Shelley | 51,811 | 60.9% | 8,521 | 27.0% | 8.9% | 2nd |
| Neath | THOMAS, Daniel | 56,097 | 66.2% | 6,722 | 18.1% | -1.8% | 2nd |
| Cardiff West | MCEVOY, Neil | 66,762 | 65.6% | 6,096 | 13.9% | 6.9% | 3rd |
| Caerphilly | NEWTON, Beci | 63,603 | 63.3% | 5,895 | 14.6% | -2.1% | 4th |
| Cynon Valley | GRIFFITHS, Cerith | 51,422 | 59.3% | 5,126 | 16.8% | -3.5% | 2nd |
| Clwyd West | JONES, Marc | 58,644 | 64.8% | 4,651 | 12.2% | -3.2% | 4th |
| Pontypridd | LEWIS, Osian | 58,940 | 64.3% | 4,348 | 11.5% | 4.2% | 5th |
| Carmarthen West and South Pembrokeshire | WILLIAMS, Elwyn | 57,755 | 69.9% | 4,201 | 10.4% | -0.0% | 4th |
| Islwyn | ACKERMAN, Lyn | 55,697 | 63.6% | 3,794 | 10.7% | -2.3% | 4th |
| Aberavon | HIGGITT, Duncan | 49,821 | 63.3% | 3,663 | 11.6% | 4.5% | 4th |
| Clwyd South | AP GWYNFOR, Mabon | 54,996 | 63.8% | 3,620 | 10.3% | 1.6% | 4th |
| Ogmore | THOMAS, Tim | 55,572 | 63.4% | 3,556 | 10.1% | 0.5% | 4th |
| Aberconwy | MEURIG, Dafydd | 45,525 | 66.2% | 3,536 | 11.7% | -6.1% | 3rd |
| Swansea East | JONES, Dic | 58,011 | 58.0% | 3,498 | 10.4% | 3.7% | 4th |
| Cardiff South and Penarth | FODAY, Ben | 76,006 | 61.4% | 3,443 | 7.4% | 3.2% | 4th |
| Merthyr Tydfil and Rhymney | MANN, Rhayna | 61,716 | 53.0% | 3,099 | 9.5% | 4.4% | 4th |
| Gower | THOMAS, Darren | 61,820 | 69.2% | 3,051 | 7.1% | 0.5% | 4th |
| Vale of Glamorgan | JOHNSON, Ian | 72,794 | 70.5% | 2,869 | 5.6% | 0.1% | 4th |
| Blaenau Gwent | LEWIS, Steffan | 51,335 | 61.7% | 2,849 | 9.0% | 4.9% | 4th |
| Bridgend | RADCLIFFE, James | 59,998 | 65.8% | 2,784 | 7.1% | 1.1% | 4th |
| Preseli Pembrokeshire | OSMOND, John | 57,291 | 70.8% | 2,518 | 6.2% | -3.0% | 5th |
| Wrexham | HARPER, Carrie | 50,992 | 64.2% | 2,501 | 7.6% | 1.5% | 4th |
| Vale of Clwyd | ROWLANDS, Mair | 56,505 | 62.4% | 2,486 | 7.1% | 1.2% | 4th |
| Cardiff North | WALKER JONES, Elin | 67,196 | 76.1% | 2,301 | 4.5% | 1.2% | 4th |
| Swansea West | ROBERTS, Harri | 58,776 | 59.8% | 2,266 | 6.4% | 2.4% | 5th |
| Torfaen | HACKLEY-GREEN, Boydd | 61,896 | 61.3% | 2,169 | 5.7% | 0.4% | 4th |
| Cardiff Central | POLLARD, Martin | 57,456 | 67.3% | 1,925 | 5.0% | 1.5% | 6th |
| Monmouth | CLARK, Jonathan | 62,248 | 76.2% | 1,875 | 4.0% | 1.2% | 5th |
| Delyn | ROWLINSON, Paul | 53,639 | 69.8% | 1,803 | 4.8% | -0.2% | 4th |
| Brecon and Radnorshire | GREAVES, Freddy | 54,441 | 73.6% | 1,767 | 4.4% | 1.9% | 5th |
| Montgomeryshire | GRIFFITH, Ann | 48,690 | 69.3% | 1,745 | 5.2% | -3.1% | 5th |
| Alyn and Deeside | HURST, Jacqueline | 62,016 | 66.6% | 1,608 | 3.9% | 0.0% | 5th |
| Newport West | COOPEY, Simon | 62,137 | 64.9% | 1,604 | 4.0% | 1.2% | 4th |
| Newport East | SALKELD, Tony | 56,015 | 62.7% | 1,231 | 3.5% | 1.4% | 5th |
Turnout as calculated by the House of Commons Library, is the total number of votes cast and not spoiled, divided by the size of the electorate.
Under section 13(b) of the Representation of the People Act 1985, a candidate gaining 5% or less of the vote share will forfeit their deposit.