An election to the 57th Parliament of the United Kingdom for the constituency area of Stockton South, held as part of the general election on 8 June 2017.
Labour gain from Conservatives by Paul Williams with a majority of 888 - 1.6% - on a turnout of 71.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| WILLIAMS, Paul | Lab | 26,102 | 48.5% | 11.5% |
| WHARTON, James | Con | 25,214 | 46.8% | 0.1% |
| OUTTERSIDE, David | UKIP | 1,186 | 2.2% | -8.4% |
| DURNING, Drew | LD | 951 | 1.8% | -0.9% |
| FITZGERALD, Jo | Green | 371 | 0.7% | -1.1% |
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 75,625, having a valid vote count of 53,824 and an invalid vote count of 82.
Result declared at 02:02 on 9 June 2017.