Foothill High School is a public secondary school located in the unincorporated community of North Tustin, California. It has a mailing address of Santa Ana, but it is a part of the Tustin Unified School District.

Tustin Unified School District was created from the 1972 voter-approved unification of the Tustin Elementary School District and the Tustin Union High School District. It is located in Tustin, a city in Orange County, California. Its district territory comprises Tustin, the unincorporated community of North Tustin, and parts of the cities of Irvine and Santa Ana. It has 18 elementary schools, five middle schools, four high schools, one K-8 school, and one adult school.