• broken image

    St. Mary's Preparatory

    Orchard Lake Schools

  • broken image


    Attendance Hotline:
    Tracie Robinson
    (248) 392-9467


    Summer Camps




    Orchard Lake St. Mary’s Preparatory has announced a new, innovative approach to learning and student development in the Fall of 2020. St. Mary’s will become the first Catholic high school in its region to operate under a co-divisional model, with boys and girls educated in a single-gender learning environment on the same campus.


  • News & Events

    2023-2024 St. Mary's Prep News and Events

    broken image

    Academic Calendar

    View 2024-2025 Calendar

    St. Mary's Preparatory


    broken image


    Good luck in all your future endeavors ladies and gentlemen, we will miss you!

    broken image

    Derby-Themed Brunch Helps Angels Place

    April 2024

    broken image

    Athletes for Christ &

    Food Drive

    2024 Food Drive

    broken image

    St. Mary's Prep

    Orchard Lake St. Mary's Announces Retirement of Bob Pyles, Board of Regents Appoints Leonard Karschnia As New Headmaster 

    broken image

    Boys Div. Commencement Speaker


    broken image

    OLSM Band

    Spring Concert

    May 8, 2024

    broken image

    St. Mary's Prep Making a Difference

    April 2024

    broken image

    Eaglets Soar in Spring Sports

    We’re so excited to share that the boys golf team won the MHSAA State Championship at Forest Akers! Congratulations on being the first golf team in ...

    broken image


    Four OLSM rowing team boats qualified

    for and competed in the Scholastic Rowing

    Association of America ...

    broken image

    Former Assistant to Ernest Hemingway ...

    April 2024 

    broken image


    First Division 1 State Title!

    March 16, 2024

    broken image

    July 2024

    Campus Communicator

    broken image

    Fire Drill


    The fire drill was conducted on the following dates:


    April 22, 2024 - Fire Drill

    March 4, 2024 - Fire Drill

    December 5, 2023 - Fire Drill

    November 3, 2023 - Fire Drill

    September 15, 2023 - Fire Drill


    broken image

    Safety Drill

    A successful safety drill was conducted on

    September 7, 2023, at St. Mary's Prep

    broken image

    Tornado Drill

    A successful tornado drill was conducted on

    March 20, 2024, at St. Mary's Prep

    October 04, 2024, at St. Mary's Prep

  • St. Mary's Prep Announcements

    We are thrilled to announce that Mr. Bob Pyles has accepted a three-year contract extension to remain the Headmaster at Orchard Lake St. Mary's Preparatory.  

  • Events

    St. Mary's Preparatory

    ٢٦ مايو ٢٠٢٤
    ٨ مايو ٢٠٢٤
    ١ مايو ٢٠٢٤
    ٤ مارس ٢٠٢٤
    ١٥ نوفمبر ٢٠٢٣
    ١٥ نوفمبر ٢٠٢٣
    ٧ سبتمبر ٢٠٢٣
    More Posts
  • What is Co-Divisional?

    This model offers a single-gender classroom experience alongside opportunities for boys and girls to engage socially, spiritually and in co-curricular activities. St. Mary’s prepares its students to excel in college and beyond by developing their abilities to think critically, work collaboratively, and succeed independently.


    In this culture, for the first time, both boys and girls will have all of the advantages of co-educational interaction without social pressures in the classroom. With the boys and girls in separate classrooms for the majority of their instruction, students have a choice of when and how they socialize during break times, before, and after the school day ends.


    Our mission and message remain the same:


    1. God

    2. Family

    3. St. Mary's


  • Welcome to St. Mary's


    St. Mary’s Preparatory sits on 115 acres of land located at Commerce and Orchard Lake Roads in Orchard Lake, Michigan. We are roughly 25 miles northwest of Detroit. Our Campus sits beautifully on 200 feet of shoreline on Orchard Lake. With immaculate views of Orchard Lake, we have 32 buildings on campus.

  • WE ARE


    A Catholic, college preparatory high school with a Polish-American heritage and legacy since 1885 A.D. We exist to provide deserving students with the moral guidance, discipline, and education to become Christ-like models of service and leadership for the world.



  • Girls Division

    Starting in the Fall semester of 2020, our historic institution will break new ground with the opening of the St. Mary's Preparatory Girls Division. This unique model will allow us to educate young women with the same Christ-like model that we have used use to educate young men for over 135 years.

  • Boys Division

    With 135 years of Catholic Education on our campus, St. Mary's Preparatory is one of the premiere Catholic boys educational institutions in the nation.

  • News & Events

  • Hello & Welcome!

    Prep School Office: 248-836-1292

    School Fax: 248-683-1740

    St. Mary's Preparatory is located at
    3535 Commerce Rd.

    Orchard Lake, MI 48324

    Headmaster: Leonard Karschnia