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About SEK-El Castillo

Learn about our international IB ® World boarding school which is also NEASC accredited to offer the American high school diploma track. 

SEK-El Castillo is more than just a private school

Everything we do is about fostering students’ intellectual, emotional and personal development; supporting them to become questioning and courageous individuals with an international perspective fit for the 21st century.  

Located in an exclusive and safe setting, SEK-El Castillo boasts a beautiful natural backdrop of mountains and forest and is just 20 minutes from downtown Madrid. The school is outfitted with the latest technology in teaching and learning, with the best, evidence-based practices in IB private school education. Moreover, next door is Camilo José Cela University with whom our students are often encouraged to collaborate on projects and learning beyond the classroom.

SEK-El Castillo was founded in 1972, and since then tens of thousands of students have been taught by its international teaching team. The school offers next-generation learning technology, the chance to live on campus in the boarding house, and an education programme meeting SEK Schools' rigorous quality standards. SEK-El Castillo has an elite International Sports Academy for high performance athletes, a music baccalaurate programme, and is accredited by NEASC to provide the American High School Diploma track. Learn more about our private school in person and arrange a visit!