An election to the 56th Parliament of the United Kingdom for the constituency area of Thornbury and Yate, held as part of the general election on 7 May 2015.
Conservative gain from Liberal Democrats by Luke Hall with a majority of 1,495 - 3.1% - on a turnout of 73.5%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| HALL, Luke | Con | 19,924 | 41.0% | 3.9% |
| WEBB, Steve | LD | 18,429 | 37.9% | -14.0% |
| MARTIN, Russ | UKIP | 5,126 | 10.6% | 7.0% |
| ROBERTS, Hadleigh | Lab | 3,775 | 7.8% | 0.8% |
| HAMILTON, Iain | Green | 1,316 | 2.7% | - |
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 66,066, having a valid vote count of 48,570 and an invalid vote count of 163.
Result declared at 05:39 on 8 May 2015.