Founded in 1960 as Marian High School, Mater Dei Catholic has evolved into a thriving TK-12 Catholic school in San Diego. With nearly 1,500 students, Mater Dei Catholic is the second largest private school in San Diego. We are committed to inspiring the hearts, minds, and souls of our student. As Crusaders, we are dedicated to Christian service, academic excellence and innovation. Our Blessed Mother is revered as our patroness who intercedes to help lead us to her son, Jesus.