Private Schools in Islandia, New York

Smithtown Christian School is a highly-rated private Christian school serving families throughout Suffolk County, including Islandia residents. The school provides a rigorous academic program integrated with biblical worldview education, offering college preparatory courses, honors classes, and comprehensive STEM programs. The campus features modern classrooms, science laboratories, athletic facilities, and dedicated art and music spaces. Known for its strong community atmosphere and individualized attention, the school maintains small class sizes and offers diverse extracurricular activities including competitive sports, drama, and community service programs. The school emphasizes character development and college readiness.

St. John the Baptist Diocesan High School is a highly-regarded Catholic college preparatory school serving students from across Long Island, including Islandia families. The school offers a comprehensive curriculum with over 20 Advanced Placement courses, specialized academies in STEM and business, and extensive fine arts programs. With a strong focus on faith-based education and community service, the school maintains a 99% college acceptance rate. Facilities include modern science labs, technology centers, athletic complexes, and performing arts spaces. The school is known for its competitive athletic programs and vibrant student life.

The Knox School is a prestigious co-educational college preparatory school serving Long Island families, including those in Islandia. Founded over a century ago, Knox offers a rigorous academic program with small class sizes, advanced placement courses, and comprehensive college counseling. The 42-acre campus features state-of-the-art facilities including science laboratories, art studios, athletic fields, and a newly renovated performing arts center. The school emphasizes character development alongside academic excellence, offering diverse extracurricular activities from competitive sports to robotics and theater programs.