An election to the 57th Parliament of the United Kingdom for the constituency area of Monmouth, held as part of the general election on 8 June 2017.
Conservative hold by David Davies with a majority of 8,206 - 16.5% - on a turnout of 76.6%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| DAVIES, David | Con | 26,411 | 53.1% | 3.2% |
| JONES, Ruth | Lab | 18,205 | 36.6% | 9.8% |
| GERMAN, Veronica | LD | 2,064 | 4.2% | -1.1% |
| DAMON, Carole | PC | 1,338 | 2.7% | -1.3% |
| CHANDLER, Ian | Green | 954 | 1.9% | -1.5% |
| NEALE, Roy | UKIP | 762 | 1.5% | -8.9% |
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 64,909, having a valid vote count of 49,734 and an invalid vote count of 64.
Result declared at 02:36 on 9 June 2017.