Gareth Thomas Elections contested
Parliament Member page for Gareth Thomas
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 | Harrow West | General election | Lab / Co-op | - | - | 1st |
| 12 December 2019 | Harrow West | General election | Lab / Co-op | 25,132 | 52.4% | 1st |
| 8 June 2017 | Harrow West | General election | Lab / Co-op | 30,640 | 60.8% | 1st |
| 7 May 2015 | Harrow West | General election | Lab / Co-op | 21,885 | 47.0% | 1st |
| 6 May 2010 | Harrow West | General election | Lab / Co-op | 20,111 | 43.6% | 1st |