An election to the 57th Parliament of the United Kingdom for the constituency area of Cities Of London and Westminster, held as part of the general election on 8 June 2017.
Conservative hold by Mark Field with a majority of 3,148 - 8.1% - on a turnout of 62.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| FIELD, Mark | Con | 18,005 | 46.6% | -7.5% |
| DOGUS, Ibrahim | Lab | 14,857 | 38.4% | 11.1% |
| FOX, Bridget | LD | 4,270 | 11.0% | 4.1% |
| MCNALLY, Lawrence | Green | 821 | 2.1% | -3.3% |
| BHATTI, Anil | UKIP | 426 | 1.1% | -4.1% |
| LORD, Tim | Ind | 173 | 0.4% | - |
| LOVE, Ankit | Ind | 59 | 0.2% | - |
| WEENEN, Benjamin | YPP | 43 | 0.1% | - |
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 61,533, having a valid vote count of 38,654 and an invalid vote count of 133.
Result declared at 02:50 on 9 June 2017.