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