Lanarkshire (Siorrachd Lannraig in Gaelic), officially the County of Lanark, was formerly a county of Scotland.
It was bounded to the north by Stirlingshire and a detached portion of Dunbartonshire, to the northeast by Stirlingshire, West Lothian, to the east by Peeblesshire, to the southeast and south by Dumfriesshire, to the southwest by Dumfriesshire and Ayrshire and to the west by Ayrshire, Renfrewshire and Dunbartonshire. The city of Glasgow was part of Lanarkshire until 1893.
Lanarkshire was for some purposes treated as three separate counties: the upper, middle and lower wards, until the Local Government (Scotland) Act 1889.
North Lanarkshire and South Lanarkshire have a joint board for valuation and electoral registration. There is also a joint health board, which does not cover Rutherglen and the surrounding area in South Lanarkshire. Without the northern portion of North Lanarkshire, this is also a Lieutenancy area.