John McDonnell Elections contested
Parliament Member page for John McDonnell
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 | Hayes and Harlington | General election | Lab | - | - | 1st |
| 12 December 2019 | Hayes and Harlington | General election | Lab | 24,545 | 55.8% | 1st |
| 8 June 2017 | Hayes and Harlington | General election | Lab | 31,796 | 66.5% | 1st |
| 7 May 2015 | Hayes and Harlington | General election | Lab | 26,843 | 59.6% | 1st |
| 6 May 2010 | Hayes and Harlington | General election | Lab | 23,377 | 54.8% | 1st |