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 |
| Merthyr Tydfil and Rhymney | MANN, Rhayna | 61,716 | 53.0% | 3,099 | 9.5% | 4.4% | 4th |
| Swansea East | JONES, Dic | 58,011 | 58.0% | 3,498 | 10.4% | 3.7% | 4th |
| Cynon Valley | GRIFFITHS, Cerith | 51,422 | 59.3% | 5,126 | 16.8% | -3.5% | 2nd |
| Swansea West | ROBERTS, Harri | 58,776 | 59.8% | 2,266 | 6.4% | 2.4% | 5th |
| Rhondda | REES-OWEN, Shelley | 51,811 | 60.9% | 8,521 | 27.0% | 8.9% | 2nd |
| Torfaen | HACKLEY-GREEN, Boydd | 61,896 | 61.3% | 2,169 | 5.7% | 0.4% | 4th |
| Cardiff South and Penarth | FODAY, Ben | 76,006 | 61.4% | 3,443 | 7.4% | 3.2% | 4th |
| Blaenau Gwent | LEWIS, Steffan | 51,335 | 61.7% | 2,849 | 9.0% | 4.9% | 4th |
| Vale of Clwyd | ROWLANDS, Mair | 56,505 | 62.4% | 2,486 | 7.1% | 1.2% | 4th |
| Newport East | SALKELD, Tony | 56,015 | 62.7% | 1,231 | 3.5% | 1.4% | 5th |
| Caerphilly | NEWTON, Beci | 63,603 | 63.3% | 5,895 | 14.6% | -2.1% | 4th |
| Aberavon | HIGGITT, Duncan | 49,821 | 63.3% | 3,663 | 11.6% | 4.5% | 4th |
| Ogmore | THOMAS, Tim | 55,572 | 63.4% | 3,556 | 10.1% | 0.5% | 4th |
| Islwyn | ACKERMAN, Lyn | 55,697 | 63.6% | 3,794 | 10.7% | -2.3% | 4th |
| Clwyd South | AP GWYNFOR, Mabon | 54,996 | 63.8% | 3,620 | 10.3% | 1.6% | 4th |
| Wrexham | HARPER, Carrie | 50,992 | 64.2% | 2,501 | 7.6% | 1.5% | 4th |
| Pontypridd | LEWIS, Osian | 58,940 | 64.3% | 4,348 | 11.5% | 4.2% | 5th |
| Clwyd West | JONES, Marc | 58,644 | 64.8% | 4,651 | 12.2% | -3.2% | 4th |
| Newport West | COOPEY, Simon | 62,137 | 64.9% | 1,604 | 4.0% | 1.2% | 4th |
| Llanelli | WILLIAMS, Vaughan | 59,314 | 65.0% | 8,853 | 23.0% | -7.0% | 2nd |
| Dwyfor Meirionnydd | SAVILLE-ROBERTS, Liz | 44,394 | 65.1% | 11,811 | 40.9% | -3.5% | 1st |
| Cardiff West | MCEVOY, Neil | 66,762 | 65.6% | 6,096 | 13.9% | 6.9% | 3rd |
| Bridgend | RADCLIFFE, James | 59,998 | 65.8% | 2,784 | 7.1% | 1.1% | 4th |
| Neath | THOMAS, Daniel | 56,097 | 66.2% | 6,722 | 18.1% | -1.8% | 2nd |
| Aberconwy | MEURIG, Dafydd | 45,525 | 66.2% | 3,536 | 11.7% | -6.1% | 3rd |
| Arfon | WILLIAMS, Hywel | 40,492 | 66.3% | 11,790 | 43.9% | 8.0% | 1st |
| Alyn and Deeside | HURST, Jacqueline | 62,016 | 66.6% | 1,608 | 3.9% | 0.0% | 5th |
| Cardiff Central | POLLARD, Martin | 57,456 | 67.3% | 1,925 | 5.0% | 1.5% | 6th |
| Ceredigion | PARKER, Mike | 54,242 | 69.0% | 10,347 | 27.7% | -0.6% | 2nd |
| Gower | THOMAS, Darren | 61,820 | 69.2% | 3,051 | 7.1% | 0.5% | 4th |
| Montgomeryshire | GRIFFITH, Ann | 48,690 | 69.3% | 1,745 | 5.2% | -3.1% | 5th |
| Delyn | ROWLINSON, Paul | 53,639 | 69.8% | 1,803 | 4.8% | -0.2% | 4th |
| Carmarthen West and South Pembrokeshire | WILLIAMS, Elwyn | 57,755 | 69.9% | 4,201 | 10.4% | -0.0% | 4th |
| Ynys Môn | ROWLANDS, John | 49,939 | 69.9% | 10,642 | 30.5% | 4.3% | 2nd |
| Vale of Glamorgan | JOHNSON, Ian | 72,794 | 70.5% | 2,869 | 5.6% | 0.1% | 4th |
| Carmarthen East and Dinefwr | EDWARDS, Jonathan | 55,750 | 70.7% | 15,140 | 38.4% | 2.8% | 1st |
| Preseli Pembrokeshire | OSMOND, John | 57,291 | 70.8% | 2,518 | 6.2% | -3.0% | 5th |
| Brecon and Radnorshire | GREAVES, Freddy | 54,441 | 73.6% | 1,767 | 4.4% | 1.9% | 5th |
| Cardiff North | WALKER JONES, Elin | 67,196 | 76.1% | 2,301 | 4.5% | 1.2% | 4th |
| Monmouth | CLARK, Jonathan | 62,248 | 76.2% | 1,875 | 4.0% | 1.2% | 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.