An election to the 57th Parliament of the United Kingdom for the constituency area of Lancaster and Fleetwood, held as part of the general election on 8 June 2017.
Labour hold by Cat Smith with a majority of 6,661 - 14.5% - on a turnout of 68.5%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| SMITH, Cat | Lab | 25,342 | 55.1% | 12.8% |
| OLLERENSHAW, Eric | Con | 18,681 | 40.6% | 1.4% |
| LONG, Robin | LD | 1,170 | 2.5% | -0.8% |
| NOVELL, Rebecca | Green | 796 | 1.7% | -3.3% |
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 67,154, having a valid vote count of 45,989 and an invalid vote count of 94.
Result declared at 03:57 on 9 June 2017.