Cessnock High School is a government-funded co-educational comprehensive secondary day school, located in Aberdare, in the Hunter Valley of New South Wales, Australia.

The school enrolled approximately 636 students in 2020, from Year 7 to Year 12, of whom 25 percent identified as Indigenous Australians and two percent were from a language background other than English.

[1] The school is operated by the NSW Department of Education; the principal is Peter Riley.

The high school was moved to its current site, on Aberdare Road, in May 1938.

[5] During World War II, slip trenches were dug out at the school.