Crestwood High School is a public high school in Crestwood, Baulkham Hills, in the north-west of Sydney, Australia. Crestwood High School offers an education culminating in the award of the HSC, administered in accordance with New South Wales Education Standards Authority. Their overall state score is 90. The school offers comprehensive classes for students in grades seven through to twelve.

The school is of moderate size, counting 1,062 students and 94 employees in 2014, slightly smaller than many nearby high schools. Entry for prospective out-of-area students is increasingly competitive. In addition to the standard educational facilities, the school has a farm used for lessons in agriculture, sizeable arts and technology faculties, and a support unit which provides special education classes for persons with disabilities.