John McDonnell Elections contested
Parliament Member page for John McDonnell
Elections listed as contested and won are those forming part of the general elections in 2010, 2015, 2017, 2019 or 2024 and any by-election contested during the 58th Parliament. A person may have contested an election outside this grouping.
| Election | Constituency | Election type | Party | Vote count | Vote share | Position |
| 4 July 2024 | Hayes and Harlington | General election | Lab | 20,405 | 53.3% | 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 |