An election to the 57th Parliament of the United Kingdom for the constituency area of Ynys Môn, held as part of the general election on 8 June 2017.
Labour hold by Albert Owen with a majority of 5,259 - 14.1% - on a turnout of 70.6%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| OWEN, Albert | Lab | 15,643 | 41.9% | 10.7% |
| DAVIES, Tomos | Con | 10,384 | 27.8% | 6.6% |
| WYN JONES, Ieuan | PC | 10,237 | 27.4% | -3.1% |
| TURNER, James | UKIP | 624 | 1.7% | -13.0% |
| JACKSON, Sarah | LD | 479 | 1.3% | -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 52,921, having a valid vote count of 37,367 and an invalid vote count of 40.
Result declared at 02:28 on 9 June 2017.