St. Mary's Preparatory is proud to announce the groundbreaking of the new classroom building to open for the Fall 2022 semester.

    To read the press release, ​CLICK HERE











    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.


  • 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.

  • Latest News

    St. Mary's prep students lounge open now!

    Track & Field


    Below are the results and pictures from the Division 2 Track & Field Finals at Zeeland Stadium on Saturday, June 5...


    Edward Watkins, State Champion 400m


    Lance McClain, 3rd place High Jump


    5th place, 4x200m: Matthew Watkins, Fletcher Hoven, Vincent Kirma and Edward Watkins.


    OLSM finished 11th in the state.

    Lacrosse Regional 2021

    Lacrosse Team

    Woo Hoo! Regional Champs after an 11-3 against Flint Powers!

    Next up -- Lacrosse Quarterfinal 6 vs ADA Forest Hills Eastern on Friday, June 4 at 6:30 PM at Lansing Catholic Lacrosse Stadium!


    St. Mary's prep students lounge open now!

    Crew Team

    Congratulations to our women’s crew team who took second at states this past weekend. An incredible season for our inaugural girls division!

    St. Mary's prep students lounge open now!

    Graduation - Class 2021

    Congratulations to the men of the class of 2021 graduating today. 🦅


    St. Mary's prep students lounge open now!


    Creativity cannot be halted by a pandemic. In fact, the arts, artmaking, and creativity in all its forms are more important than ever. In the past year, our visual art students have demonstrated their resilience to the unique challenge of a traditional hands-on process-especially during a time of quarantine.


    Click HERE to see our 2021 Virtual Student Art Exhibit Here you will find the results of what our students created after they explored several mediums, tools and techniques along with learning the elements and principles of art. Some students have more experience than others. All were eager to discover new tools available to assist their creative endeavors.


    St. Mary's prep students lounge open now!

    Girls 1st Track Competition

    Coach Lengel passed along the following information and picture for University Ligget Invitational:

    "Our girls had a great first competition! Larkin Mielke placed in the 100 and 200 meter dash, the 4x200 team was 3rd overall, and Cameron Cole was 3rd in the long jump with Maya Little also placing."

    Congratulations girls!

    St. Mary's prep students lounge open now!

    Snowboard Individual State Championship

    Congratulations to Mason Mohr for qualifying for the Snowboard Individual State Championships held Friday, February 12 at Alpine Valley!

    St. Mary's prep students lounge open now!

    Inspiring Words

    At today’s socially distanced class Mass, Father left the senior students with two thoughts: “1. God has great things planned for each of you. 2. You are stronger than you think you are.” His words resonated perfectly with the class of 2021.

    St. Mary's prep students lounge open now!

    Volleyball Team

    Congratulations to our Girls Volleyball team on their history-making win last night against Lake Shore High School!

  • 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: Bob Pyles