An election to the 57th Parliament of the United Kingdom for the constituency area of Mitcham and Morden, held as part of the general election on 8 June 2017.
Labour hold by Siobhain McDonagh with a majority of 21,375 - 44.4% - on a turnout of 70.0%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MCDONAGH, Siobhain | Lab | 33,039 | 68.7% | 8.0% |
| KEARNS, Alicia | Con | 11,664 | 24.2% | 1.1% |
| MATHYS, Claire | LD | 1,494 | 3.1% | 0.1% |
| HILTON, Richard | UKIP | 1,054 | 2.2% | -7.3% |
| COLLINS, Laura | Green | 644 | 1.3% | -1.8% |
| COKE, Des | CPA | 223 | 0.5% | -0.0% |
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 68,705, having a valid vote count of 48,118 and an invalid vote count of 126.
Result declared at 02:43 on 9 June 2017.