Melanie Onn Elections won
Parliament Member page for Melanie Onn
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 and won an election outside this grouping.
| Election | Constituency | Election type | Party | Vote count | Vote share | Majority |
| 4 July 2024 | Great Grimsby and Cleethorpes | General election | Lab | 15,336 | 41.9% | 4,803 |
| 8 June 2017 | Great Grimsby | General election | Lab | 17,545 | 49.4% | 2,565 |
| 7 May 2015 | Great Grimsby | General election | Lab | 13,414 | 39.8% | 4,540 |