Renfrewshire or the County of Renfrew is a historic county, registration county and lieutenancy area in the west central Lowlands of Scotland. The lieutenancy area covers the three modern council areas of Inverclyde, Renfrewshire and East Renfrewshire, and this area is occasionally termed Greater Renfrewshire to distinguish it from the modern council area called Renfrewshire. The historic county additionally included territory on the south-western edge of Glasgow which was gradually transferred to the administrative area of the city as it grew.

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.