An election to the 57th Parliament of the United Kingdom for the constituency area of Gainsborough, held as part of the general election on 8 June 2017.
Conservative hold by Edward Leigh with a majority of 17,023 - 33.1% - on a turnout of 67.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| LEIGH, Edward | Con | 31,790 | 61.8% | 9.1% |
| TITE, Catherine | Lab | 14,767 | 28.7% | 7.4% |
| ROLLINGS, Lesley | LD | 3,630 | 7.1% | 0.4% |
| PEARSON, Vicky | Green | 1,238 | 2.4% | -0.2% |
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 75,893, having a valid vote count of 51,425 and an invalid vote count of 150.
Result declared at 03:07 on 9 June 2017.