An election to the 58th Parliament of the United Kingdom for the constituency area of Mitcham and Morden, held as part of the general election on 12 December 2019.
Labour hold by Siobhain McDonagh with a majority of 16,482 - 36.0% - on a turnout of 65.3%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MCDONAGH, Siobhain | Lab | 27,964 | 61.1% | -7.5% |
| WILLIAMS, Toby | Con | 11,482 | 25.1% | 0.9% |
| TAYLOR, Luke | LD | 3,717 | 8.1% | 5.0% |
| MADDOCKS, Jeremy | BRX | 1,202 | 2.6% | - |
| MASLIN, Pippa | Green | 1,160 | 2.5% | 1.2% |
| COKE, Des | CPA | 216 | 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 70,021, having a valid vote count of 45,741 and an invalid vote count of 104.
Result declared at 03:02 on 13 December 2019.