An election to the 56th Parliament of the United Kingdom for the constituency area of Hertsmere, held as part of the general election on 7 May 2015.
Conservative hold by Oliver Dowden with a majority of 18,461 - 36.9% - on a turnout of 67.9%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| DOWDEN, Oliver | Con | 29,696 | 59.3% | 3.3% |
| BUTLER, Richard | Lab | 11,235 | 22.4% | 3.7% |
| WARD, Frank | UKIP | 6,383 | 12.7% | 9.1% |
| BOWLER, Sophie | LD | 2,777 | 5.5% | -11.8% |
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 73,767, having a valid vote count of 50,091 and an invalid vote count of 200.
Result declared at 04:50 on 8 May 2015.