Maybole Castle is a 16th-century castle located on High Street in Maybole, South Ayrshire, Scotland. Originally built for the Earls of Cassillis, it is an L-shaped construction with Victorian two-storey extensions. It is associated with a legend of John Faa, in which an earl killed Faa and imprisoned his wife, the Countess of Cassilis, in the castle. The castle became a category A listed building in 1971. It was added to the Buildings at Risk Register for Scotland in 2009, before receiving funding in the early 21st century for renovations.