Cumnock & Doon Valley was a district council area which existed from 1975 to 1996. It was one of 19 district councils that delivered a range of local level services within the wider area of Strathclyde Region, which over this period was one of the 12 regions into which Scotland was divided.
Cumnock & Doon Valley was one of the four district council areas within the Ayr sub-region of Strathclyde, and it was formed from the eastern part of the traditional county of Ayrshire. The result was a district that included settlements such as Cumnock and Dalmellington. It was bordered by the districts of Kyle & Carrick, Kilmarnock & Loudoun, East Kilbride and Clydesdale in Strathclyde; plus Nithsdale, Stewartry, and Wigtown Districts in Dumfries & Galloway.
When regions and districts disappeared from the scene in a major reorganisation of Scottish local government in 1996, the district council area of Cumnock & Doon Valley was joined with Kilmarnock & Loudoun to become the unitary council area of East Ayrshire, one of the 32 unitary council areas into which Scotland has since been divided.