King William's College and The Buchan School, a privately owned entity headquartered in the United Kingdom, was founded in 1833, employing approximately 100 individuals. The institution functions as a co-educational private school, catering to pupils aged 3 to 18, located near Castletown on the Isle of Man. It is a member of the International Baccalaureate and Headmasters' and Headmistresses' Conference organisations. The College operates across two distinct sites: a main senior school campus situated on the shore of Castletown Bay, and a prep school, known as The Buchan School, located in the Westhill part of Castletown. The school enrolls approximately five hundred pupils.