Mark Williams Elections contested
Parliament Member page for Mark Williams
Elections listed as contested and won are those forming part of the general elections in 2010, 2015, 2017, 2019 or 2024. A person may have contested or contested and won an election outside this grouping.
| Election | Constituency | Election type | Party | Vote count | Vote share | Position |
| 4 July 2024 | Ceredigion Preseli | General election | LD | 6,949 | 15.0% | 2nd |
| 12 December 2019 | Ceredigion | General election | LD | 6,975 | 17.4% | 3rd |
| 8 June 2017 | Ceredigion | General election | LD | 11,519 | 29.0% | 2nd |
| 7 May 2015 | Ceredigion | General election | LD | 13,414 | 35.9% | 1st |
| 6 May 2010 | Ceredigion | General election | LD | 19,139 | 50.0% | 1st |