An election to the 57th Parliament of the United Kingdom for the constituency area of St Helens South and Whiston, held as part of the general election on 8 June 2017.
Labour hold by Marie Rimmer with a majority of 24,343 - 46.0% - on a turnout of 66.9%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| RIMMER, Marie | Lab | 35,879 | 67.8% | 8.0% |
| MCRANDAL, Ed | Con | 11,536 | 21.8% | 5.9% |
| SPENCER, Brian | LD | 2,101 | 4.0% | -1.7% |
| HITCHEN, Mark | UKIP | 1,953 | 3.7% | -10.3% |
| NORTHEY, Jess | Green | 1,417 | 2.7% | -1.9% |
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 79,036, having a valid vote count of 52,886 and an invalid vote count of 79.
Result declared at 02:04 on 9 June 2017.