Roslin Castle (sometimes spelt Rosslyn) is a partially ruined castle near the village of Roslin in Midlothian, Scotland. It is located around 9 miles south of Edinburgh, on the north bank of the North Esk, only a few hundred metres from the famous Rosslyn Chapel. There has been a castle on the site since the early 14th century, when the Sinclair Earls of Orkney fortified the site.
The first castle at Roslin was built in the 1330s for Henry Sinclair, Earl of Orkney. The Sinclair, or St Clair, family (also anciently spelt Sanctclare), were of Norman origin, and had held land in the Lothians since 1162. It was built on a rocky promontory near the site of the Battle of Roslin, where the Scots defeated the English in 1303. In the late 14th or early 15th century, Henry's son Henry, 2nd Earl of Orkney built a new rectangular, round-cornered keep at the south-west corner. The courtyard was entered via a drawbridge over an artificial ditch, giving access to a pend in the small north range.
Following destruction during the Rough Wooing of 1544, the castle was rebuilt. This structure, built into the cliffs of Roslin Glen, has remained at least partially habitable ever since. The castle is accessed via a high bridge, which replaced the earlier drawbridge. Roslin was renovated in the 1980s and now serves as holiday accommodation.