An election to the 57th Parliament of the United Kingdom for the constituency area of Blaenau Gwent, held as part of the general election on 8 June 2017.
Labour hold by Nick Smith with a majority of 11,907 - 36.8% - on a turnout of 63.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| SMITH, Nick | Lab | 18,787 | 58.0% | 0.0% |
| COPNER, Nigel | PC | 6,880 | 21.2% | 12.3% |
| WEST, Tracey | Con | 4,783 | 14.8% | 4.0% |
| MAY, Dennis | UKIP | 973 | 3.0% | -14.9% |
| BROWNING, Vicki | Ind | 666 | 2.1% | - |
| SULLIVAN, Cameron | LD | 295 | 0.9% | -1.0% |
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 51,227, having a valid vote count of 32,384 and an invalid vote count of 35.
Result declared at 02:01 on 9 June 2017.