An election to the 56th Parliament of the United Kingdom for the constituency area of Hemel Hempstead, held as part of the general election on 7 May 2015.
Conservative hold by Mike Penning with a majority of 14,420 - 29.1% - on a turnout of 66.5%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| PENNING, Mike | Con | 26,245 | 52.9% | 2.9% |
| BRESLIN, Tony | Lab | 11,825 | 23.8% | 3.0% |
| KOCH, Howard | UKIP | 7,249 | 14.6% | 12.1% |
| MARTINS, Rabi | LD | 2,402 | 4.8% | -18.0% |
| BORGARS, Alan | Green | 1,660 | 3.3% | - |
| HALL, Brian | Ind | 252 | 0.5% | - |
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 74,616, having a valid vote count of 49,633 and an invalid vote count of 194.
Result declared at 07:47 on 8 May 2015.