An election to the 57th Parliament of the United Kingdom for the constituency area of Hemel Hempstead, held as part of the general election on 8 June 2017.
Conservative hold by Mike Penning with a majority of 9,445 - 18.1% - on a turnout of 70.3%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| PENNING, Mike | Con | 28,735 | 55.0% | 2.1% |
| TATTERSHALL, Mandi | Lab | 19,290 | 36.9% | 13.1% |
| SYMINGTON, Sally | LD | 3,233 | 6.2% | 1.3% |
| HASSAN, Sherief | Green | 1,024 | 2.0% | -1.4% |
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 74,415, having a valid vote count of 52,282 and an invalid vote count of 151.
Result declared at 02:04 on 9 June 2017.