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

  • Tuesday, Aug. 15
    Faculty Meeting - 2:00 p.m. - 7:00 p.m.
  • Wednesday, Aug. 16
    New Parent & Student Orientation
    5:00 pm-7 pm @ the the Castle


    • The Library will open at 10:00 on Thursday, May 18 and Friday May 19, 2017.
    • The Library will close from May 25 – June 16, 2017. Summer hours will begin on Monday, June 19, 2017.

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...