An election to the 56th Parliament of the United Kingdom for the constituency area of Cardiff North, held as part of the general election on 7 May 2015.
Conservative hold by Craig Williams with a majority of 2,137 - 4.2% - on a turnout of 76.1%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| WILLIAMS, Craig | Con | 21,709 | 42.4% | 4.9% |
| WILLIAMS, Mari | Lab | 19,572 | 38.3% | 1.2% |
| WILKINSON, Ethan | UKIP | 3,953 | 7.7% | 5.4% |
| WALKER JONES, Elin | PC | 2,301 | 4.5% | 1.2% |
| CLARK, Elizabeth | LD | 1,953 | 3.8% | -14.5% |
| OSNER, Ruth | Green | 1,254 | 2.5% | 1.7% |
| GREEN, Jeff | CHP | 331 | 0.6% | - |
| JENKINS, Shaun | ALC | 78 | 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 67,196, having a valid vote count of 51,151 and an invalid vote count of 80.
Result declared at 04:10 on 8 May 2015.