An election to the 58th Parliament of the United Kingdom for the constituency area of South West Hertfordshire, held as part of the general election on 12 December 2019.
Conservative hold by Gagan Mohindra with a majority of 14,408 - 23.5% - on a turnout of 76.0%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MOHINDRA, Gagan | Con | 30,327 | 49.6% | -8.4% |
| GAUKE, David | Ind | 15,919 | 26.0% | - |
| AKLAKUL, Ali | Lab | 7,228 | 11.8% | -13.9% |
| SYMINGTON, Sally | LD | 6,251 | 10.2% | -1.5% |
| PASHBY, Tom | Green | 1,466 | 2.4% | -0.2% |
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 80,499, having a valid vote count of 61,191 and an invalid vote count of 277.
Result declared at 05:07 on 13 December 2019.