An election to the 56th Parliament of the United Kingdom for the constituency area of St Austell and Newquay, held as part of the general election on 7 May 2015.
Conservative gain from Liberal Democrats by Steve Double with a majority of 8,173 - 16.2% - on a turnout of 65.7%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| DOUBLE, Steve | Con | 20,250 | 40.2% | 0.2% |
| GILBERT, Stephen | LD | 12,077 | 24.0% | -18.8% |
| MATHEWS, David | UKIP | 8,503 | 16.9% | 13.2% |
| HOPKINS, Deborah | Lab | 5,150 | 10.2% | 3.1% |
| SLADE, Steve | Green | 2,318 | 4.6% | - |
| COLE, Dick | MK | 2,063 | 4.1% | -0.2% |
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 76,607, having a valid vote count of 50,361 and an invalid vote count of 95.
Result declared at 07:11 on 8 May 2015.