Cranbrook School is an independent Anglican day and boarding school, with multiple campuses in Sydney's eastern suburbs New South Wales, Australia for students from pre-school to year 12. The school was founded in 1918 with the Rev'd Frederick Thomas Perkins as the first headmaster. Cranbrook has a non-selective enrollment policy and currently caters for approximately 1,680 students from early learning (4 years old) to Year 12 (18 years old), including 80 boarders from Years 7 to 12. Cranbrook is affiliated with the Association of Heads of Independent Schools of Australia (AHISA), the Junior School Heads Association of Australia (JSHAA), the Australian Boarding Schools' Association (ABSA), and the Headmasters' and Headmistresses' Conference. It is a founding member of the Combined Associated Schools (CAS). and the Independent Sporting Association (ISA).