An election to the 57th Parliament of the United Kingdom for the constituency area of Hayes and Harlington, held as part of the general election on 8 June 2017.
Labour hold by John McDonnell with a majority of 18,115 - 37.9% - on a turnout of 65.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MCDONNELL, John | Lab | 31,796 | 66.5% | 6.9% |
| SMITH, Greg | Con | 13,681 | 28.6% | 3.9% |
| DIXON, Cliff | UKIP | 1,153 | 2.4% | -9.5% |
| NEWTON DUNN, Bill | LD | 601 | 1.3% | -0.7% |
| BOWMAN, John | Green | 571 | 1.2% | -0.6% |
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 73,268, having a valid vote count of 47,802 and an invalid vote count of 118.
Result declared at 03:10 on 9 June 2017.