An election to the 56th Parliament of the United Kingdom for the constituency area of South West Wiltshire, held as part of the general election on 7 May 2015.
Conservative hold by Andrew Murrison with a majority of 18,168 - 35.2% - on a turnout of 70.7%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MURRISON, Andrew | Con | 27,198 | 52.7% | 1.0% |
| BROWN, Matthew | UKIP | 9,030 | 17.5% | 12.0% |
| AYLETT, George | Lab | 6,948 | 13.5% | 2.0% |
| CARBIN, Trevor | LD | 5,482 | 10.6% | -19.9% |
| RANDLE, Phil | Green | 2,985 | 5.8% | - |
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 73,018, having a valid vote count of 51,643 and an invalid vote count of 108.
Result declared at 03:48 on 8 May 2015.