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.

[2] The constituency takes in Helensburgh and Lomond from the Argyll and Bute council area and covers Dumbarton and the Vale of Leven in West Dunbartonshire.

It is a traditional Labour territory but, as with many such heartlands, the party’s one-time supporters have become increasingly disaffected... Helensburgh, with its pretty, blustery waterfront, is more affluent and has benefited from its proximity to [Faslane naval] base.

[3]Incumbent Jackie Baillie has cultivated a profile as a hard working local MSP,[4] a reputation that has helped her retain the seat as the Labour Party has declined nationally.

In the 2021 election there was speculation that the seat could vote SNP for the first time,[5] but in the end, Baillie increased her majority from 109 to 1,483.