San Mateo High School is a National Blue Ribbon comprehensive four-year public high school in San Mateo, California, United States. It serves grades 9–12 and is part of the San Mateo Union High School District. San Mateo High School continues the "Tradition of Excellence" that first started in 1902 and strives to create a unique campus life for all students and staff, which remains different from any other high school in the San Mateo Union High School District.