An election to the 56th Parliament of the United Kingdom for the constituency area of Bolton West, held as part of the general election on 7 May 2015.
Conservative gain from Labour by Chris Green with a majority of 801 - 1.6% - on a turnout of 66.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| GREEN, Chris | Con | 19,744 | 40.6% | 2.3% |
| HILLING, Julie | Lab | 18,943 | 39.0% | 0.5% |
| HORSEFIELD, Bob | UKIP | 7,428 | 15.3% | 11.3% |
| MARTIN, Andrew | LD | 1,947 | 4.0% | -13.2% |
| SMITH, Andy | Ind | 321 | 0.7% | - |
| VICKERS, John | TUSC | 209 | 0.4% | - |
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 72,719, having a valid vote count of 48,592 and an invalid vote count of 197.
Result declared at 05:23 on 8 May 2015.