An election to the 57th Parliament of the United Kingdom for the constituency area of Romsey and Southampton North, held as part of the general election on 8 June 2017.
Conservative hold by Caroline Nokes with a majority of 18,046 - 36.0% - on a turnout of 74.6%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| NOKES, Caroline | Con | 28,668 | 57.2% | 2.9% |
| ROYCE, Catherine | LD | 10,622 | 21.2% | 3.5% |
| PAFFEY, Darren | Lab | 9,614 | 19.2% | 7.3% |
| CALLAGHAN, Ian | Green | 953 | 1.9% | -2.8% |
| JERRARD, Don | JACP | 271 | 0.5% | - |
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 67,186, having a valid vote count of 50,128 and an invalid vote count of 117.
Result declared at 03:26 on 9 June 2017.