An election to the 58th Parliament of the United Kingdom for the constituency area of Louth and Horncastle, held as part of the general election on 12 December 2019.
Conservative hold by Victoria Atkins with a majority of 28,868 - 55.2% - on a turnout of 65.7%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| ATKINS, Victoria | Con | 38,021 | 72.7% | 8.7% |
| GREEN, Ellie | Lab | 9,153 | 17.5% | -9.2% |
| PEPPER, Ross | LD | 4,114 | 7.9% | 4.1% |
| HILL, Peter | MRLP | 1,044 | 2.0% | 1.1% |
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 79,634, having a valid vote count of 52,332 and an invalid vote count of 286.
Result declared at 03:27 on 13 December 2019.