An election to the 56th Parliament of the United Kingdom for the constituency area of Horsham, held as part of the general election on 7 May 2015.
Conservative hold by Jeremy Quin with a majority of 24,658 - 43.3% - on a turnout of 72.0%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| QUIN, Jeremy | Con | 32,627 | 57.3% | 4.6% |
| ARTHUR, Roger | UKIP | 7,969 | 14.0% | 8.9% |
| MILLSON, Morwen | LD | 6,647 | 11.7% | -20.5% |
| DAVIS, Martyn | Lab | 6,499 | 11.4% | 3.9% |
| GREEN, Darrin | Green | 2,198 | 3.9% | 2.8% |
| SMITH, Raymond | SN | 375 | 0.7% | - |
| DUGGAN, Jim | PPNV | 307 | 0.5% | 0.1% |
| RAE, Jim | Ind | 303 | 0.5% | - |
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 79,085, having a valid vote count of 56,925 and an invalid vote count of 234.
Result declared at 07:08 on 8 May 2015.