Located in Aliso Viejo, St. Mary’s School is a private International Baccalaureate (IB) World School. St. Mary’s School is an Orange County private school dedicated to combining rigorous academic standards, foreign languages, technology, arts and music in an effort to develop students into global thinkers. Our inquiry-based approach and small class sizes combined with our highly skilled teaching staff make St. Mary’s School a world class private school in Orange County.