Mission Viejo High School 25025 Chrisanta Dr, Mission Viejo, CA92691 Mission Viejo High School is a public school home to the Diablos. With a friendly staff, Mission Viejo helps students in…More any way possible. From sports to academics, this high school is top notch with a nice campus to boot. With a large campus, overpopulation and crowded classrooms is not an issue for students. Mission Viejo is highly involved with its community, bringing adults and children of all ages to many events held on campus.