Ross-shire is a historic county in the Scottish Highlands. The county borders Sutherland to the north and Inverness-shire to the south, as well as having a complex border with Cromartyshire – a county consisting of numerous enclaves or exclaves scattered throughout Ross-shire's territory. Ross-shire includes most of Ross along with Lewis in the Outer Hebrides. Dingwall is the traditional county town. The area of Ross-shire is based on that of the historic province of Ross, but with the exclusion of the many enclaves that form Cromartyshire.

The shires of Scotland, or counties of Scotland, are historic subdivisions of Scotland established in the Middle Ages and used as administrative divisions until 1975. Originally established for judicial purposes, from the 17th century they started to be used for local administration purposes as well. The areas used for judicial functions (sheriffdoms) came to diverge from the shires, which ceased to be used for local government purposes after 1975 under the Local Government (Scotland) Act 1973.