An election to the 57th Parliament of the United Kingdom for the constituency area of South Down, held as part of the general election on 8 June 2017.
Sinn Féin gain from SDLP by Chris Hazzard with a majority of 2,446 - 4.8% - on a turnout of 67.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| HAZZARD, Chris | SF | 20,328 | 39.9% | 11.4% |
| RITCHIE, Margaret | SDLP | 17,882 | 35.1% | -7.2% |
| FORSYTHE, Diane | DUP | 8,867 | 17.4% | 9.3% |
| MCKEE, Harold | UUP | 2,002 | 3.9% | -5.4% |
| MCMURRAY, Andrew | APNI | 1,814 | 3.6% | -0.2% |
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 75,685, having a valid vote count of 50,893 and an invalid vote count of 189.
Result declared at 03:15 on 9 June 2017.