Diamond Ranch High School serves 1827 students and is located between Pomona and Diamond Bar, serving students in North Diamond Bar. It is a part of the Pomona Unified School District.
From 2009 to 2010, Diamond Ranch's Academic Performance Index rose 1 point from 808 to 809. Compared statewide, the school's API scores 8/10. Compared against a group of 100 similar schools, the score is 9/10.
Diamond Ranch is noted in the are for its unique architecture, and its architect Thom Mayne is a winner of the Pritzker Prize. The campus has been featured in a number of films and commercials since it opened in 2001.
Their mascot is the Panther.