Dumbarton (Gaelic: Dùn Breatann) is a constituency of the Scottish Parliament (Holyrood) covering parts of the council areas of Argyll and Bute and West Dunbartonshire. It elects one Member of the Scottish Parliament (MSP) by the first past the post method of election. It is also one of ten constituencies in the West Scotland electoral region, which elects seven additional members, in addition to the ten constituency MSPs, to produce a form of proportional representation for the region as a whole.