Castleson High is a high school institution established in 1995. Informally referred to by its acronym "CH", it is a private, non-sectarian, educational institution located in City Heights, 5 kilometers south of Bacolod City, the capital of Negros Occidental province in the Philippines, and Victorias City, 34 kilometers north of Bacolod City. High school enrollment at both of these locations is close to 100 students. Its major feeder elementary schools come from Jack and Jill School branches and other local schools.