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

  • Oct. 14, 2015
    All School Testing
    Test fee is $15.00. 
    Test Fee is to be paid to Mrs. Posa in the Main Preparatory building by 10/9/2015. 
    Payments can be made in cash or by check. (Checks payable to St. Mary’s Preparatory.)

  • Oct. 18, 2015
    Ring Day
    10:45 a.m. Mass - 12:30 Lunch

  • Nov. 1, 2015
    Open House
    11:00 a.m. Mass
    12:00 p.m.-3:00 p.m. Tours

  • Nov. 7, 2015
    Annual Auction
    6:00 p.m. - midnight. Doors open at 6 @ S.M.A.C.
    Click to Donate


  • Oct 16th:  Ring Day practice, 1:00.  Juniors (and non-juniors involved in the event) will not be in 6th and 7th hour.
  • Oct 18th:  Ring Day (Staff and Faculty post time:  10:25 in the cafeteria, in your Sunday best)