An election to the 57th Parliament of the United Kingdom for the constituency area of Horsham, held as part of the general election on 8 June 2017.
Conservative hold by Jeremy Quin with a majority of 23,484 - 37.9% - on a turnout of 74.9%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| QUIN, Jeremy | Con | 36,906 | 59.5% | 2.2% |
| BRADY, Susannah | Lab | 13,422 | 21.7% | 10.2% |
| MILLSON, Morwen | LD | 7,644 | 12.3% | 0.7% |
| ROSS, Catherine | Green | 1,844 | 3.0% | -0.9% |
| ARTHUR, Roger | UKIP | 1,533 | 2.5% | -11.5% |
| SMITH, James | SN | 375 | 0.6% | -0.1% |
| DUGGAN, Jim | PPNV | 263 | 0.4% | -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 82,772, having a valid vote count of 61,987 and an invalid vote count of 106.
Result declared at 05:26 on 9 June 2017.