An election to the 56th Parliament of the United Kingdom for the constituency area of Alyn and Deeside, held as part of the general election on 7 May 2015.
Labour hold by Mark Tami with a majority of 3,343 - 8.1% - on a turnout of 66.6%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| TAMI, Mark | Lab | 16,540 | 40.0% | 0.4% |
| KNIGHTLY, Laura | Con | 13,197 | 31.9% | -0.3% |
| SMILLIE, Blair | UKIP | 7,260 | 17.6% | 15.0% |
| JONES, Tudor | LD | 1,733 | 4.2% | -14.1% |
| HURST, Jacqueline | PC | 1,608 | 3.9% | 0.0% |
| IBBOTSON, Alasdair | Green | 976 | 2.4% | - |
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 62,016, having a valid vote count of 41,314 and an invalid vote count of 55.
Result declared at 03:38 on 8 May 2015.