Welcome to St. Mary's Catholic and Boarding High School

St. Mary's Preparatory - A Catholic, College Prep, All-Boys High School for Day and Boarding Students

St. Mary's Preparatory is a four year secondary program of pre-college studies in a disciplined environment preparing young men for future study and careers of service. The Prep has a day student and boarding school program. St. Mary's is accredited by the State of Michigan Board of Education, the Archdiocese of Detroit, and MNSAA/MANS. Almost 100% of our graduates attend college. "If the Orchard Lake Schools did not exist, it would be necessary to establish them." -- Pope John Paul II

Upcoming Events


    This is the last week that the boys can wear school polos.  Next week is Spirit Week.  The boys will either have to wear their blazers and school ties on Wednesday during Spirit Week or they may dress up in formal wear.  The week after Spirit Week the boys will be required to wear shirts and ties (blazers and school ties on Mass days).