An election to the 57th Parliament of the United Kingdom for the constituency area of Mid Sussex, held as part of the general election on 8 June 2017.
Conservative hold by Nicholas Soames with a majority of 19,673 - 31.9% - on a turnout of 73.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| SOAMES, Nicholas | Con | 35,082 | 56.9% | 0.8% |
| MOUNTAIN, Greg | Lab | 15,409 | 25.0% | 11.1% |
| OSBORNE, Sarah | LD | 7,855 | 12.7% | 1.3% |
| JERREY, Chris | Green | 1,571 | 2.5% | -1.7% |
| BROTHERS, Toby | UKIP | 1,251 | 2.0% | -10.0% |
| THUNDERCLAP, Baron Von | MRLP | 464 | 0.8% | 0.2% |
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 84,170, having a valid vote count of 61,632 and an invalid vote count of 113.
Result declared at 04:05 on 9 June 2017.