West Dunbartonshire (Scots: Wast Dunbartanshire; Scottish Gaelic: Siorrachd Dhùn Bhreatainn an Iar) is one of the 32 local government council areas of Scotland. The area lies to the west of the City of Glasgow and contains many of Glasgow's commuter towns and villages, as well as the city's suburbs. West Dunbartonshire also borders onto Argyll and Bute, East Dunbartonshire, Renfrewshire and Stirling.

The area was formed on 1 April 1996 from part of the former Strathclyde Region, namely the entire district of Clydebank and the Dumbarton district less the Helensburgh area. In the Local Government etc. (Scotland) Act 1994 that created the council area its name was Dumbarton and Clydebank. The council, elected as a shadow authority in 1995, resolved to change the name of the area to West Dunbartonshire.

The area is essentially composed of three parts: the towns of Clydebank, Dumbarton and the Vale of Leven district. West Dunbartonshire is administered from Dumbarton, although Clydebank is the largest town.