Menlo School, also referred to as Menlo, is a private college preparatory school in Atherton, California, United States, across the street from Menlo Park. Menlo comprises a middle school, grades 6–8, with approximately 230 students, and a high school, grades 9–12, with about 570 students. The two schools share a campus but operate as semi-autonomous units with select overlapping administration, such as the Head of School. Menlo was established in 1915, and in 1927 added a junior college that became Menlo College. The college was formally separated from Menlo School in 1994, but they continued to share a single dining hall until 2017, when Menlo built a cafeteria.