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Top 20 Best Pennsylvania Private High Schools Belonging to National Association of Independent Schools (NAIS) (2025)

For the 2025 school year, there are 56 private high schools belonging to National Association of Independent Schools (NAIS) serving 26,425 students in Pennsylvania. You can also find more schools membership associations in Pennsylvania.

The private high schools belonging to National Association of Independent Schools (NAIS) in Pennsylvania include The Agnes Irwin School, Grier School, and Merion Mercy Academy.

The average tuition cost is $36,171, which is higher than the Pennsylvania private high school average tuition cost of $18,490.

46% of private high schools belonging to National Association of Independent Schools (NAIS) in Pennsylvania are religiously affiliated (most commonly Catholic and Friends).

The Crefeld School Photo - Two Upper School Students on a beautiful day in Crefeld's field

Cristo Rey Philadelphia High School Photo

Germantown Academy Photo - Second grade students research various species in the Wissahickon Creek, which runs through the heart of GA's campus.

Westtown School Photo - The Westtown School campus includes 600 acres of land, a 14-acre lake with a beach and boathouse, and an arboretum and natural forest.

Kimberton Waldorf School Photo - The 5th grade Pentathlon brings together Waldorf schools from a three-hour radius for a day of friendly athletic competition and collaboration -- the culmination of their Greek studies.

Milton Hershey School Photo - At Milton Hershey School, our founders' generosity and vision have enabled us to develop and maintain a whole child approach to education and programming that comes at no cost to our students or their families.

Delaware Valley Friends School Photo - Delaware Valley Friends School is a national leader in the field of educating students (grades 1-12) with dyslexia, dysgraphia, executive function disorders, ADHD, and other learning differences located in the Philadelphia area.

AIM Academy Photo - MEETING LEARNING CHALLENGES WITH SCIENCE & LOVE: AT AIM, we recognize that children who learn differently need to be taught differently - and that's exactly what we do. Our passionately committed, highly-trained faculty employ techniques proven effective, and the results are remarkable. Each day we witness young people who doubted themselves in every way discover the gift of fearless learning.

Springside Chestnut Hill Academy Photo - Our Lower School students run into our beautiful McCausland building each morning excited to see their teachers and classmates. Our students feel at home here, and they learn how to take risks in our nurturing setting where making mistakes is embraced as part of the learning journey. Lower School students have tremendous resources available to them throughout our campus and in the neighboring Wissahickon woods, providing a variety of activities to hone their developing skills. Our single-sex environments allow children to learn who they are without the pressures of gender stereotypes and foster relationships that last a lifetime. Our faculty understand the enormous potential of these moments and are always on the lookout for ways to build on a student's curiosity and help their passions come alive.

The Quaker School At Horsham Photo - TQS: Where childhood shines!

Villa Maria Academy High School Photo - Villa Maria is located on the western Main Line, on 45 acres in Malvern, PA. Students move between three classroom buildings and a newly-constructed student union, which houses the dining hall, administrative offices, counseling, study space, and the chapel.

Sacred Heart Academy Bryn Mawr Photo - Sacred Heart Academy Bryn Mawr is a Catholic, independent college preparatory school for girls K-12, founded in 1865 by the Religious of the Sacred Heart of Jesus. Known as SHA, the private girls' school is located in PA outside of Philadelphia with elementary, middle and upper school divisions located on one campus.

The Haverford School Photo - Haverford's visual arts program includes 10 dedicated art studios and a design and engineering studio. Students experiment with 3D printing and other new media.

Dock Mennonite Academy Photo - The Rosenberger Academic Center features state of the art facilities in science, family and consumer science, a robotics course, and a beautiful new library. Schedule your visit to Dock today!

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