West Dunbartonshire is a county constituency of the House of Commons of the Parliament of the United Kingdom.

The historic constituency was created under the House of Commons (Redistribution of Seats) Act 1949 and first used in the 1950 general election.

[citation needed] In 1975, under the Local Government (Scotland) Act 1973, Scottish counties were abolished in favour of regions and districts and islands council areas, and the county of Dunbarton was divided between several districts of the new region of Strathclyde.

The Third Periodical Review took account of new local government boundaries and the results were implemented for the 1983 general election.

[citation needed] 2005–2024: The existing constituency was created for the 2005 general election as a result of the Fifth Periodical Review of the Boundary Commission for Scotland.