Lake Illawarra High School is a government-funded co-educational comprehensive secondary day school, located on Reddall Parade, which follows the shores of Lake Illawarra, in the Illawarra region of New South Wales, Australia. Established in 1972, the school enrolled approximately 519 students in 2018, from Year 7 to Year 12, of whom 18 percent identified as Indigenous Australians and eight percent were from a language background other than English. The school is operated by the New South Wales Department of Education.