St. Mary's Preparatory Catholic High School OLS The Polish Mission SSCMS
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

  • Thursday, April 27, 2017
    Honors Convocation 8:30 a.m.
  • Monday, May 1 – 4th, 2017
    Final Exams SENIORS ONLY T.B.A.
  • Thursday, May 4, 2017
    Alumni Induction
  • Sunday, May 7  
    Graduation Day
    10:30 a.m. Procession
    11:00 a.m. Mass
    2:00 p.m. Commencement



    Honors Convocation is Thursday, April 27th after Mass in the old gym.
    Dismissal will be approximately 11:15 am.
    Dress code: school ties and blazers.
    There is no school for Seniors on Friday, April 28th.

Latest News

  • OLSM Food Drive 2016/17
    Letter from Sister Judie

    OLSM Food Drive 2016/17
  • Proclamation Honoring Olsm Varsity Football Team

    March 16, 2017 - Our Varsity Football Team at Oakland County Board of Commissioners Meeting
  • 2016 Chancellor's Christmas Concert

  • St. Mary's winning touchdown...