An election to the 57th Parliament of the United Kingdom for the constituency area of Blackburn, held as part of the general election on 8 June 2017.
Labour hold by Kate Hollern with a majority of 20,368 - 42.9% - on a turnout of 67.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| HOLLERN, Kate | Lab | 33,148 | 69.8% | 13.5% |
| EASTWOOD, Bob | Con | 12,780 | 26.9% | -0.4% |
| MILLER, Duncan | Ind | 878 | 1.8% | - |
| AHMED, Irfan | LD | 709 | 1.5% | -0.7% |
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 70,664, having a valid vote count of 47,515 and an invalid vote count of 187.
Result declared at 02:20 on 9 June 2017.