Siobhain McDonagh Elections contested
Parliament Member page for Siobhain McDonagh
Elections listed as contested and won are those forming part of any general election or by-election contested since since the 2010 general election. A person may have contested an election outside of this grouping.
| Election | Constituency | Election type | Party | Vote count | Vote share | Position |
| 4 July 2024 | Mitcham and Morden | General election | Lab | - | - | 1st |
| 12 December 2019 | Mitcham and Morden | General election | Lab | 27,964 | 61.1% | 1st |
| 8 June 2017 | Mitcham and Morden | General election | Lab | 33,039 | 68.7% | 1st |
| 7 May 2015 | Mitcham and Morden | General election | Lab | 27,380 | 60.7% | 1st |
| 6 May 2010 | Mitcham and Morden | General election | Lab | 24,722 | 56.4% | 1st |