Mission Viejo High School is a four-year comprehensive public high school located in Mission Viejo, California, United States, as part of the Saddleback Valley Unified School District.

Students within its attendance boundaries live in western Mission Viejo, southwest Lake Forest, Trabuco Canyon, Rancho Santa Margarita, and Laguna Hills.

Its mascot is Pablo the Diablo and its colors are scarlet and gold.

[1][2] Mission Viejo has been an International Baccalaureate (IB) school since July 1985.

The students who meet the IB requirements are eligible for the International Baccalaureate Diploma.