Mark Williams Elections contested
Parliament Member page for Mark Williams
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 | Ceredigion Preseli | General election | LD | - | - | - |
| 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 |