An election to the 57th Parliament of the United Kingdom for the constituency area of Milton Keynes South, held as part of the general election on 8 June 2017.
Conservative hold by Iain Stewart with a majority of 1,665 - 2.6% - on a turnout of 69.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| STEWART, Iain | Con | 30,652 | 47.5% | 0.7% |
| O'NEILL, Hannah | Lab | 28,987 | 44.9% | 12.8% |
| MAHER, Tahir | LD | 1,895 | 2.9% | -1.0% |
| PEDDLE, Vince | UKIP | 1,833 | 2.8% | -10.4% |
| FINDLAY, Graham | Green | 1,179 | 1.8% | -1.5% |
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 92,417, having a valid vote count of 64,546 and an invalid vote count of 122.
Result declared at 04:22 on 9 June 2017.