An election to the 56th Parliament of the United Kingdom for the constituency area of Belfast South, held as part of the general election on 7 May 2015.
SDLP hold by Alasdair McDonnell with a majority of 906 - 2.3% - on a turnout of 60.0%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MCDONNELL, Alasdair | SDLP | 9,560 | 24.5% | -16.5% |
| BELL, Jonathan | DUP | 8,654 | 22.2% | -1.5% |
| BRADSHAW, Paula | APNI | 6,711 | 17.2% | 2.3% |
| Ó MUILLEOIR, Máirtín | SF | 5,402 | 13.9% | - |
| MCCUNE, Rodney | UUP | 3,549 | 9.1% | - |
| BAILEY, Clare | Green | 2,238 | 5.7% | 2.7% |
| STOKER, Bob | UKIP | 1,900 | 4.9% | - |
| MANTON, Ben | Con | 582 | 1.5% | - |
| KERR, Lily | WP | 361 | 0.9% | - |
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 64,927, having a valid vote count of 38,957 and an invalid vote count of 183.
Result declared at 03:49 on 8 May 2015.