One Tree Hill College is a state coeducational secondary school located in the district of Ellerslie in Auckland, New Zealand. One Tree Hill College, formerly known as Penrose High School, opened on 1 February 1955. In 2019 it had a student body of 1160 consisting of more than 40 different cultures. The governing body for the college since 1989 has been the One Tree Hill College Board of Trustees. It provides curriculum, discipline and financial oversight but day-to-day management of the college, within the board's policy framework, is handled by the Principal and the Senior Leadership Team.