An election to the 57th Parliament of the United Kingdom for the constituency area of Colne Valley, held as part of the general election on 8 June 2017.
Labour gain from Conservatives by Thelma Walker with a majority of 915 - 1.5% - on a turnout of 71.6%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| WALKER, Thelma | Lab | 28,818 | 47.7% | 12.7% |
| MCCARTNEY, Jason | Con | 27,903 | 46.2% | 1.7% |
| BURKE, Cahal | LD | 2,494 | 4.1% | -1.9% |
| KING, Sonia | Green | 892 | 1.5% | -1.9% |
| SADIO, Patricia | Ind | 313 | 0.5% | - |
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 84,387, having a valid vote count of 60,420 and an invalid vote count of 158.
Result declared at 04:26 on 9 June 2017.