An election to the 58th Parliament of the United Kingdom for the constituency area of Portsmouth North, held as part of the general election on 12 December 2019.
Conservative hold by Penny Mordaunt with a majority of 15,780 - 34.4% - on a turnout of 64.4%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MORDAUNT, Penny | Con | 28,172 | 61.4% | 6.6% |
| MARTIN, Amanda | Lab | 12,392 | 27.0% | -6.7% |
| HARRISON, Antonia | LD | 3,419 | 7.4% | 1.9% |
| DAY, Lloyd | Green | 1,304 | 2.8% | 1.2% |
| MADGWICK, George | Ind | 623 | 1.4% | - |
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 71,299, having a valid vote count of 45,910 and an invalid vote count of 145.
Result declared at 03:30 on 13 December 2019.