An election to the 58th Parliament of the United Kingdom for the constituency area of South Northamptonshire, held as part of the general election on 12 December 2019.
Conservative hold by Andrea Leadsom with a majority of 27,761 - 41.5% - on a turnout of 73.7%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| LEADSOM, Andrea | Con | 41,755 | 62.4% | -0.1% |
| KITCHEN, Gen | Lab | 13,994 | 20.9% | -6.4% |
| LOFTS, Chris | LD | 7,891 | 11.8% | 6.2% |
| DONALDSON, Denise | Green | 2,634 | 3.9% | 1.8% |
| PHILLIPS, Josh | Ind | 463 | 0.7% | - |
| MCCUTCHEON, Stuart | Ind | 171 | 0.3% | - |
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 90,842, having a valid vote count of 66,908 and an invalid vote count of 266.
Result declared at 07:13 on 13 December 2019.