Founded in 1909, Montebello High School is a public high school which is part of the Montebello Unified School District, and has an enrollment of approximately 2,600 students in grades 9-12. Its campus is located in Montebello, California, a suburb of Los Angeles. It is named for the city of Montebello.

Montebello is a city in Los Angeles County, California, United States, located just east of East Los Angeles and southwest of San Gabriel Valley. It is an independent city 8 mi (13 km) east of downtown Los Angeles. It is considered part of the Gateway Cities and San Gabriel Valley Cities, and is a member of the Gateway Cities Council of Governments and the San Gabriel Valley Council of Governments.