An election to the 58th Parliament of the United Kingdom for the constituency area of Carmarthen East and Dinefwr, held as part of the general election on 12 December 2019.
Plaid Cymru hold by Jonathan Edwards with a majority of 1,809 - 4.4% - on a turnout of 71.4%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| EDWARDS, Jonathan | PC | 15,939 | 38.9% | -0.4% |
| HUGHES, Havard | Con | 14,130 | 34.5% | 8.2% |
| CARROLL, Maria | Lab | 8,622 | 21.0% | -8.8% |
| PROSSER, Pete | BRX | 2,311 | 5.6% | - |
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 57,419, having a valid vote count of 41,002 and an invalid vote count of 145.
Result declared at 03:02 on 13 December 2019.