An election to the 57th Parliament of the United Kingdom for the constituency area of St Ives, held as part of the general election on 8 June 2017.
Conservative hold by Derek Thomas with a majority of 312 - 0.6% - on a turnout of 76.3%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| THOMAS, Derek | Con | 22,120 | 43.2% | 4.9% |
| GEORGE, Andrew | LD | 21,808 | 42.6% | 9.4% |
| DREW, Christopher | Lab | 7,298 | 14.2% | 4.9% |
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 67,145, having a valid vote count of 51,226 and an invalid vote count of 109.
Result declared at 07:39 on 9 June 2017.