The Hills Grammar School (commonly referred to as Hills Grammar) is an independent nonsectarian co-educational early learning, primary and secondary day school, located in Kenthurst, a suburb in the Hills district of Sydney, New South Wales, Australia. Hills Grammar is affiliated with the Association of Heads of Independent Schools of Australia (AHISA), the Heads of Independent Co-Educational Schools (HICES) and the Junior School Heads Association of Australia (JSHAA).