Culzean Castle is a castle overlooking the Firth of Clyde, near Maybole, Carrick, in South Ayrshire, on the west coast of Scotland.
It is the former home of the Marquess of Ailsa, the chief of Clan Kennedy, but is now owned by the National Trust for Scotland.
The clifftop castle lies within the Culzean Castle Country Park and is opened to the public. From 1972 through 2015, an illustration of the castle was featured on the reverse side of five pound notes issued by the Royal Bank of Scotland.