Castleton is a civil parish in the Scottish Borders area of Scotland, in the former Roxburghshire, in the extreme south of the Borders area. It is bounded by Northumberland (England), Dumfries and Galloway, and the parishes of Hobkirk, Southdean and Teviothead. The village of Castleton was commenced in 1793. It was built as a result of the land clearances in the 1790s when people were forced to move from Old Castleton village. While the parish retained the name Castleton, the village later became identified as New Castleton or Newcastleton. The parish is also known by its older name Liddesdale