Lanarkshire, also called the County of Lanark (Scottish Gaelic: Siorrachd Lannraig; Scots: Lanrikshire), is a historic county, lieutenancy area and registration county in the Central Lowlands and Southern Uplands of Scotland. The county is no longer used for local government purposes, but gives its name to the two modern council areas of North Lanarkshire and South Lanarkshire.
The county was established as a shire (the area controlled by a sheriff) in the twelfth century, covering most of the basin of the River Clyde. The area was sometimes known as Clydesdale. In the early fifteenth century the western part of the shire was removed to become Renfrewshire. The historic county of Lanarkshire includes Glasgow, but the city had a separate lieutenancy from 1893. A Lanarkshire County Council existed from 1890 until 1975, which was based in Glasgow until 1964 when it moved to Hamilton.