Principia School

From infancy through grade 12, your child’s educational journey at Principia is guided by those who believe in boundless possibility. More than a college-prep day and boarding school in St. Louis, Principia is founded on Christian Science principles that view each student as limitless and divinely whole.

Here, students grow through character education and experiential learning—uncovering natural strengths, developing critical thinking skills, and realizing their full potential. The 360-acre campus in Town and Country provides immersive indoor and outdoor spaces where curiosity thrives and creativity takes flight.

Above all, Principia students learn what it means to live with purpose. You’ll see the difference everywhere you look—from innovative, future-ready learning inside and outside the classroom, to a spirit of inclusivity and sportsmanship that defines our community. Principia welcomes students of all faith backgrounds. Schedule your visit today at principiaschool.org/visit and discover the Principia difference.

Bragging Rights:

• 87,000-square-foot athletic complex
• 96% attend college or university
• 100% of upper school and middle school students travel domestically and/or internationally

Imagine a place where opportunity is everywhere, and students are seen as limitless. At Principia, they believe every student has everything they need to excel in the classroom, on the sports field, up on stage, and out in the community. They simply help uncover their boundless potential. 

Founded in 1898, Principia is much more than a pre-K-12 college-prep day and boarding school in St. Louis—it 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.  

At Principia, students become critical and creative thinkers who can address challenges through effective problem-solving. Their 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.  

Principia is a Niche A+ School, ranked as the #1 Christian High School in Missouri and St. Louis and the #1 Christian K-12 School in Missouri and St. Louis. Here, students thrive in a collaborative, creative environment and grow as spiritual thinkers. Adventure and discovery await. Find your purpose at Principia School.

OPEN HOUSE

February 9
February 23
March 28 – Discovery Morning
April 6
April 20

APPLICATION DEADLINE

Grade 9: December 12, 2025

All Other Grades: January 13, 2026

ACCEPTANCE NOTIFICATION

Grade 9: February 6, 2026

All Other Grades: March 13, 2026

FUN FACTS

1. 360-acre campus with ropes challenge course, beehive, chicken coup, multiple gardens, outdoor classrooms, and trails providing a robust outdoor and experiential learning experience.
2. 100% of Upper School and Middle School students travel domestically and/or internationally
3. 100+ competitions at State Championships with 30 wins

UPCOMOING

Join Principia for our Discovery Morning on March 28 for an inside look at the learning, community, and experiences that make Principia stand out. Register here! https://www.principiaschool.org/visit 

WHATS NEW IN EDUCATION

Imagine a place where opportunity is everywhere, and students are seen as limitless. At Principia, they believe every student has everything they need to excel in the classroom, on the sports field, up on stage, and out in the community. Principia 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.  

At Principia, students become critical and creative thinkers who can address challenges through effective problem-solving. The 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.