Carstairs (Scottish Gaelic: Caisteal Tarrais) is a village in South Lanarkshire, Scotland. Carstairs is located 5 miles (8.0 km) east of the county town of Lanark and the West Coast Main Line runs through the village. The village is served by Carstairs railway station. Carstairs is best known as the location of the State Hospital for Scotland and Northern Ireland. Carstairs is applied to the places Carstairs Village and the village of Carstairs Junction where the train station is situated.