An election to the 56th Parliament of the United Kingdom for the constituency area of Caerphilly, held as part of the general election on 7 May 2015.
Labour hold by Wayne David with a majority of 10,073 - 25.0% - on a turnout of 63.3%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| DAVID, Wayne | Lab | 17,864 | 44.3% | -0.6% |
| GOULD, Sam | UKIP | 7,791 | 19.3% | 17.0% |
| DOCHERTY, Leo | Con | 6,683 | 16.6% | -0.5% |
| NEWTON, Beci | PC | 5,895 | 14.6% | -2.1% |
| BEDDOE, Katy | Green | 937 | 2.3% | - |
| AYESH, Aladdin | LD | 935 | 2.3% | -12.4% |
| DAVIES, Jaime | TUSC | 178 | 0.4% | - |
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.
An electorate of 63,603, having a valid vote count of 40,283 and an invalid vote count of 81.
Result declared at 02:59 on 8 May 2015.