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 and Victorias City, 34 kilometers north of Bacolod City in the Philippines. 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. At the City Heights location, the Sidera Special Child Center mainstreams its high school students at Castleson High.It is one of the few institutions in the country where Karate is part of the school curriculum; Karate is included in physical education class all year round.HistoryCecilia del Castillo-Lopez chose the name “Castleson” in honor of her father and the del Castillo name .Castleson High was founded by Cecilia del Castillo-Lopez as a high school in 1995 wherein 16 students in Homesite under Rhazel Estelloso and 11 students in City Heights Subd. under Ronald Loreto as pioneer classes. In the next year, Castleson High Schools in Homesite and City Heights were merged to become one school located in City Heights' new high school facility. By 2001, Castleson High in Victorias was established. A recent addition in City Heights was the Speech and Language Clinic which opened in 2008. Throughout Jack & Jill School's history, other branches in Airport, La Granja, Paglaum, and La Carlota were also opened and later closed.