CONSTITUENCY RESULT : Hertsmere
| Candidate name | Party | Gender | Number of votes | Share (%) | Change vs. 2017 for party (percentage points) | ||
| Oliver Dowden | Conservative | Male | 32,651 | 62.5% | +1.4 | ||
| Holly Kal-Weiss | Labour | Female | 11,338 | 21.7% | -6.9 | ||
| Stephen Barrett | Liberal Democrat | Male | 6,561 | 12.6% | +7.2 | ||
| John Humphries | Green | Male | 1,653 | 3.2% | +1.3 |
| Election statistics | ||
| Majority | ||
| Votes | 21,313 | |
| Percent | 40.8% | |
| Rank (1 = highest %) | 114 | |
| Turnout | ||
| Constituency | 70.6% | |
| Region | 68.2% | |
| UK | 67.3% | |
| Constituency in 2017 | 71.0% | |
| Size of electorate | 73,971 | |
| Valid votes cast | 52,203 |