Elderslie High School is a government-funded co-educational comprehensive secondary day school, located in Narellan, a town in the Macarthur region, southwest of Sydney, New South Wales, Australia.

Established in 1977, the school provides education for approximately 950 students from Year 7 to Year 12. The school is operated by the New South Wales Department of Education; the principal is Jennifer Lawrence.

Elderslie's feeder primary schools are Mawarra Public School, Elderslie Public School, Camden Public School, Camden South Public School, Cobbitty Public School, Harrington Park Public School and Spring Farm Public School.

• List of government schools in New South Wales
• Education in Australia

• Official website
• New South Wales Department of Education – Elderslie High School