An election to the 57th Parliament of the United Kingdom for the constituency area of Cardiff West, held as part of the general election on 8 June 2017.
Labour hold by Kevin Brennan with a majority of 12,551 - 26.9% - on a turnout of 69.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| BRENNAN, Kevin | Lab | 26,425 | 56.7% | 16.0% |
| SMITH, Matt | Con | 13,874 | 29.8% | 4.6% |
| DEEM, Michael | PC | 4,418 | 9.5% | -4.4% |
| MEREDITH, Alex | LD | 1,214 | 2.6% | -2.1% |
| LEWIS, Richard | UKIP | 698 | 1.5% | -9.7% |
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 66,775, having a valid vote count of 46,629 and an invalid vote count of 89.
Result declared at 03:32 on 9 June 2017.