Election for the constituency of Portsmouth North on 6 May 2010.
An election to the 55th Parliament of the United Kingdom for the constituency area of Portsmouth North, held as part of the general election on 6 May 2010.
Conservative gain from Labour by Penny Mordaunt with a majority of 7,289 - 16.5% - on a turnout of 62.7%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MORDAUNT, Penny | Con | 19,533 | 44.3% | 6.5% |
| MCCARTHY-FRY, Sarah | Lab / Co-op | 12,244 | 27.8% | -10.8% |
| SANDERS, Darren | LD | 8,874 | 20.1% | -0.2% |
| FITZGERALD, Mike | UKIP | 1,812 | 4.1% | 0.7% |
| KNIGHT, David | ED | 1,040 | 2.4% | - |
| MACLENNAN, Iain | Green | 461 | 1.0% | - |
| TOSH, Mick | TUSC | 154 | 0.3% | - |
An electorate of 70,329, having a valid vote count of 44,118 and an invalid vote count of 154.
Result declared at 06:22 on 7 May 2010. Declarations times do not form part of election declarations and should be regarded as indicative rather than official.
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.
This constituency of Portsmouth North was established by the 2010-2024 boundary set for England. This election was the first held under that boundary set. Any holds, gains and vote change percentages as a result of this election are calculated from notional results.