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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 26,391 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 $36,143, which is higher than the Pennsylvania private high school average tuition cost of $18,484.

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

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.

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 - Milton Hershey School thrives as a cost-free, private, coeducational home and school for more than 2,000 students from families of lower income.

Germantown Academy Photo - Germantown Academy's Alter Middle School and McNeil Upper School at night.

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.

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.

Cristo Rey Philadelphia High School Photo

Springside Chestnut Hill Academy Photo - Situated on a 62-acre campus in Chestnut Hill, Philadelphia, the school prides itself on preparing students to lead lives characterized by thoughtfulness, integrity, and a passion to effect positive change. SCH Academy is the product of a 2011 merger between Springside School and Chestnut Hill Academy and combines nearly 300 years of academic excellence. Learn more at www.sch.org.

Lancaster Country Day School Photo - Lower School art class

The Haverford School Photo - The crew team spent one of its preseason practices at Rushton Farm, a local CSA, harvesting potatoes, weeding the greenhouses, and clearing tomato plants.

Upland Country Day School Photo - Upland Country Day's 23 Acre Campus

MMI Preparatory School Photo - MMI Preparatory School Campus

Girard College Photo - Lower School "Bubble Day" is fun for the younger students.

Hill Top Preparatory School Photo - Graduation!

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