An election to the 57th Parliament of the United Kingdom for the constituency area of Cardiff North, held as part of the general election on 8 June 2017.
Labour gain from Conservatives by Anna McMorrin with a majority of 4,174 - 8.0% - on a turnout of 77.4%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MCMORRIN, Anna | Lab | 26,081 | 50.1% | 11.9% |
| WILLIAMS, Craig | Con | 21,907 | 42.1% | -0.3% |
| WEBB, Steffan | PC | 1,738 | 3.3% | -1.2% |
| HEMSLEY, Matthew | LD | 1,714 | 3.3% | -0.5% |
| OLDFIELD, Gary | UKIP | 582 | 1.1% | -6.6% |
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 67,221, having a valid vote count of 52,022 and an invalid vote count of 98.
Result declared at 03:09 on 9 June 2017.