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

  • Dec 6, 2015
    Chancellor’s Christmas Concert
    Shrine Chapel
  • Dec 8, 2015
    Advent by Candlelight
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  • Sunday, January 24, 2016
    Freshman Class Mass & Brunch at 11:00am at Shrine Chapel for an opportunity to celebrate Mass together!


  • Boots: In inclement weather, students are welcome to wear boots. Boots must be conservative in color and fully laced.
  • Tuesday, Dec. 8th:  Is a holy day of obligation.  The Prep will celebrate mass at 9:45. 
  • Wednesday, Dec. 9th: will be a late start day.
  • Wednesday, Dec. 9th: will be a late start day. (The late start was previously listed Dec. 8th. The 8th is a holy day of obligation. The Orchard Lake Schools will celebrate a campus Mass at 7:30.)