Baulkham Hills High School is a government-funded academically selective secondary school. It lies within Baulkham Hills in the Hills District of Sydney, New South Wales, Australia. The school is renowned for its academic achievement and ranked second in the NSW Higher School Certificate in 2016, 2017 and 2020. It also ranked fifth in 2018, ninth in 2019 and ranked third in 2021, 2022 and 2023. In 2010, the school was ranked the most popular school in NSW for high school applications.