An election to the 57th Parliament of the United Kingdom for the constituency area of South West Hertfordshire, held as part of the general election on 8 June 2017.
Conservative hold by David Gauke with a majority of 19,550 - 32.2% - on a turnout of 74.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| GAUKE, David | Con | 35,128 | 57.9% | 1.0% |
| WAKELY, Rob | Lab | 15,578 | 25.7% | 9.4% |
| TOWNSEND, Christopher | LD | 7,078 | 11.7% | 1.4% |
| DE HOEST, Paul | Green | 1,576 | 2.6% | -1.9% |
| ANDERSON, Mark | UKIP | 1,293 | 2.1% | -9.4% |
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 81,087, having a valid vote count of 60,653 and an invalid vote count of 138.
Result declared at 04:18 on 9 June 2017.