Mater Dei High School, home of the Monarchs, is a private school located in Santa Ana, California. MDHS is a catholic affiliate school with approximately 2,100 students and 23 varsity sports teams. Mater Dei High School, a co-educational college preparatory Diocesan Catholic high school, provides a holistic Catholic education, which serves a diverse community of students and recognizes each individual as a gift from God.