Couston Castle is an L-plan tower house dating from the late sixteenth or early seventeenth centuries, just north east of Dalgety Bay, at the edge of Otterston Loch in Fife, Scotland.

[1] Couston Castle was built on lands granted to Robert de London, an illegitimate son of King William the Lion (1143–1214) in 1199.

[3] For part of the second half of the seventeenth century it was occupied by Robert Blair, a Presbyterian clergyman, who was a former tutor of King Charles I,[1] and who died there in 1666.

[1] The castle was purchased by a Dunfermline businessman, Alastair Harper, in 1980, and he set about its restoration.

[3] After having been derelict for many years, the castle was restored by architect Ian Begg in 1985, who converted it into a family home.