An election to the 56th Parliament of the United Kingdom for the constituency area of Blackburn, held as part of the general election on 7 May 2015.
Labour hold by Kate Hollern with a majority of 12,760 - 29.0% - on a turnout of 60.1%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| HOLLERN, Kate | Lab | 24,762 | 56.3% | 8.5% |
| EASTWOOD, Bob | Con | 12,002 | 27.3% | 1.1% |
| TAYLOR, Dayle | UKIP | 6,280 | 14.3% | 12.2% |
| LISHMAN, Gordon | LD | 955 | 2.2% | -13.0% |
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 73,260, having a valid vote count of 43,999 and an invalid vote count of 325.
Result declared at 03:14 on 8 May 2015.