An election to the 57th Parliament of the United Kingdom for the constituency area of Southampton, Test, held as part of the general election on 8 June 2017.
Labour hold by Alan Whitehead with a majority of 11,503 - 24.5% - on a turnout of 66.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| WHITEHEAD, Alan | Lab | 27,509 | 58.7% | 17.4% |
| HOLMES, Paul | Con | 16,006 | 34.1% | 1.6% |
| GRAVATT, Thomas | LD | 1,892 | 4.0% | -0.8% |
| POPE, Andrew | ShI | 816 | 1.7% | - |
| MORRELL, Keith | Ind | 680 | 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 70,199, having a valid vote count of 46,903 and an invalid vote count of 119.
Result declared at 06:05 on 9 June 2017.