West Dunbartonshire is a county constituency of the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament (MP) by the first past the post system of election and covers the same area as the county of West Dunbartonshire. The current constituency was first used in the 2005 general election. There was also an earlier West Dunbartonshire constituency, from 1950 to 1983. The current MP is Martin Docherty-Hughes of the Scottish National Party, who was elected at the 2015 general election and was re-elected at the 2017 general election and 2019 general election.