An election to the 56th Parliament of the United Kingdom for the constituency area of Mid Sussex, held as part of the general election on 7 May 2015.
Conservative hold by Nicholas Soames with a majority of 24,286 - 42.2% - on a turnout of 70.9%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| SOAMES, Nicholas | Con | 32,268 | 56.1% | 5.4% |
| MOUNTAIN, Greg | Lab | 7,982 | 13.9% | 7.3% |
| BROTHERS, Toby | UKIP | 6,898 | 12.0% | 9.5% |
| COOPER, Daisy | LD | 6,604 | 11.5% | -26.0% |
| DIBOLL, Miranda | Green | 2,453 | 4.3% | 3.1% |
| ADAM, Beki | Ind | 958 | 1.7% | - |
| VON THUNDERCLAP, Baron | MRLP | 329 | 0.6% | 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 81,034, having a valid vote count of 57,492 and an invalid vote count of 252.
Result declared at 07:12 on 8 May 2015.