An election to the 57th Parliament of the United Kingdom for the constituency area of Lewes, held as part of the general election on 8 June 2017.
Conservative hold by Maria Caulfield with a majority of 5,508 - 10.2% - on a turnout of 76.4%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| CAULFIELD, Maria | Con | 26,820 | 49.5% | 11.5% |
| BLUNDELL, Kelly-Marie | LD | 21,312 | 39.3% | 3.5% |
| CHAPMAN, Daniel | Lab | 6,060 | 11.2% | 1.3% |
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 70,941, having a valid vote count of 54,192 and an invalid vote count of 136.
Result declared at 03:11 on 9 June 2017.