An election to the 57th Parliament of the United Kingdom for the constituency area of Northampton South, held as part of the general election on 8 June 2017.
Conservative hold by Andrew Lewer with a majority of 1,159 - 2.8% - on a turnout of 66.4%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| LEWER, Andrew | Con | 19,231 | 46.9% | 5.3% |
| MCKEEVER, Kevin | Lab | 18,072 | 44.0% | 12.2% |
| GIBBINS, Rose | UKIP | 1,630 | 4.0% | -14.3% |
| HOPE, Jill | LD | 1,405 | 3.4% | -0.9% |
| MABBUTT, Scott | Green | 696 | 1.7% | -1.9% |
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 61,766, having a valid vote count of 41,034 and an invalid vote count of 71.
Result declared at 04:32 on 9 June 2017.