An election to the 57th Parliament of the United Kingdom for the constituency area of Portsmouth North, held as part of the general election on 8 June 2017.
Conservative hold by Penny Mordaunt with a majority of 9,965 - 21.1% - on a turnout of 66.1%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MORDAUNT, Penny | Con | 25,860 | 54.8% | 7.8% |
| KHAN, Rumal | Lab | 15,895 | 33.7% | 9.9% |
| SANDERS, Darren | LD | 2,608 | 5.5% | -0.7% |
| FITZGERALD, Mike | UKIP | 1,926 | 4.1% | -15.0% |
| HAWKINS, Ken | Green | 791 | 1.7% | -1.5% |
| JENKINS, Joe | LPUK | 130 | 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 71,374, having a valid vote count of 47,210 and an invalid vote count of 77.
Result declared at 03:21 on 9 June 2017.