Mililani High School is the only public high school located in Mililani Town CDP, City and County of Honolulu, Hawaii, U.S. on the island of Oʻahu. Serving an enrollment of over 2,600 students in grades 9–12, Mililani High School is one of the largest public schools in Hawaiʻi. In 2005, the high school held the distinction of holding the largest graduating class in the state.