An election to the 56th Parliament of the United Kingdom for the constituency area of South Down, held as part of the general election on 7 May 2015.
SDLP hold by Margaret Ritchie with a majority of 5,891 - 13.8% - on a turnout of 56.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| RITCHIE, Margaret | SDLP | 18,077 | 42.3% | -6.1% |
| HAZZARD, Chris | SF | 12,186 | 28.5% | -0.2% |
| MCKEE, Harold | UUP | 3,964 | 9.3% | - |
| WELLS, Jim | DUP | 3,486 | 8.2% | -0.4% |
| REILLY, Henry | UKIP | 3,044 | 7.1% | - |
| TODD, Martyn | APNI | 1,622 | 3.8% | 2.5% |
| BUCHAN, Felicity | Con | 318 | 0.7% | - |
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 75,220, having a valid vote count of 42,697 and an invalid vote count of 303.
Result declared at 04:44 on 8 May 2015.