Imagine a place where opportunity is everywhere, and students are seen as limitless.
At Principia, we believe every student has everything they need to excel in the classroom, on the sports field, up on stage, and out in the community. We simply help uncover their boundless potential.
Much more than a pre-K-12 college-prep day and boarding school in St. Louis, Principia is founded upon principles that see students as boundless and divinely whole.
Grounded in the teachings of Christian Science, a worldwide Christian denomination, Principia welcomes students from all faith backgrounds.
Here, students become critical and creative thinkers who can address challenges through effective problem-solving.
Our 360-acre campus also offers a unique educational experience with beautiful indoor and outdoor learning spaces as well as state-of-the-art athletic facilities and fields.
Adventure and discovery await. Find your purpose at Principia School.
Principia School recently hosted its 4th annual Empty Bowls Community Dinner, marking another successful year of giving back to the community. In partnership with Urban Harvest STL, the event contributed ...moreover $2,500 to the international Empty Bowls Project, which directly assists residents in the greater St. Louis area. hide
- 01/07/2026
In the fall of 2021, Principia School became the first high school in the United States to host a formal mediation tournament-a distinction that set a new benchmark for student-led ...moreconflict resolution programs nationwide. Five years later, Principia continues its leadership in this space. hide
- 12/26/2025
Principia School boys basketball finished strong at the prestigious City of Palms Classic Basketball Tournament in Fort Myers, Florida, solidifying their own ranking as a top team in the nation. ...more hide
- 11/07/2025
Principia School in Town & Country is highlighting its departure from traditional rote learning in favor of project-based and integrated education that develops students intellectually, morally, spiritually, physically, and socially. ...moreIt emphasizes how the school's "whole-person" approach and hands-on experiences empower students to become confident learners and purposeful leaders. hide
- 11/05/2025
Principia's Upper School students have poured countless hours of creativity, commitment, collaboration, and yes, heart, into crafting a performance that promised to transport the audience across time and space.
- 10/25/2025
A St. Louis teenager's journey from basement DJ to nonprofit founder is inspiring the next generation of musicians and entrepreneurs in unexpected ways
- 10/16/2025
Principia School's faith-based, project-rich approach encourages students to lead their own learning while developing purpose, character, and academic readiness. It shows how small classes, hands-on experiences, and a global mindset ...moreunite to cultivate confident graduates prepared for college and beyond. hide
- 10/14/2025
Quentin Coleman, a top-ranked shooting guard, announces his college choice live. The skilled player, known for deep range and on-ball creativity, discusses the journey to this pivotal moment. This broadcast ...morefeatures highlights and an in-depth look at this rising star's decision. hide
- 10/01/2025
Principia School has once again been nationally recognized as one of the Best Schools in Missouri by Niche, the country's leading college and school search platform. Niche has ranked Principia ...moreSchool as the No. 1 Best Christian High Schools in Missouri and St. Louis, and No. 1 Best Christian K-12 Schools in Missouri and St. Louis. Principia also ranked as No. 2 Best 51³Ô¹ÏÍø High Schools in Missouri and St. Louis, and No. 4 Best Private K-12 Schools in St. Louis. hide
Principia School is an independent, co-educational college preparatory school offering innovative programs for preschoolgrade 12. Grounded in the teachings of Christian Science, a worldwide Christian denomination, Principia welcomes students from all faith backgrounds. Through an integrated curriculum defined by rigor and opportunity, students learn to adapt and thrive in a rapidly changing world. Our hands-on approach develops critical and creative thinkers who can address relevant, global challenges through effective problem-solving. Our 360-acre campus offers an immersive and unique educational experience with beautiful indoor and outdoor learning spaces as well as state-of-the-art athletic facilities and fields. Principia's supportive community and character curriculum enables students to discover how living the values that uplift can improve the world around them.
Sample of notable school alumni/alumnae:
Lewis Howes (US’01, C’05) - New York Times bestselling author of The School of Greatness
Aaron Goldsmith (US’02, C’06)) - Broadcaster for the Seattle Mariners
Robert Duvall (US’49, C’53) - Academy award winning actor
Darcy Penick (US’96) - President of Bergdorf-Goodman
Marika McCauley Sine (US’96) - Chief Sustainability Officer at Starbucks
Kip Keller (US’19) - Professional soccer player - United Soccer League
Candy Crowley (US’66) - American news anchor who was CNN's chief political correspondent, specializing in American national and state elections
When is the application deadline for Principia School?
The application deadline for Principia School is Jan. 13 / rolling (applications are due on Jan. 13 but additional applications are reviewed year-round as space permits ).
