International School of Zagreb

The International School of Zagreb (ISZ) is Croatia's premier international school, serving students from Pre-Kindergarten through Grade 12 (ages 3 to 18). Established to serve the diplomatic and international business community in Zagreb, ISZ offers the American college preparatory curriculum alongside the International Baccalaureate Diploma Programme (IBDP), ensuring graduates have globally recognised qualifications for university entry worldwide. Accredited by the Middle States Association of Colleges and Schools (MSA), ISZ provides rigorous academics in a nurturing English-language environment. The school serves over 400 students from 50+ nationalities, including children of diplomats, NGO staff, and multinational company employees based in Zagreb. ISZ features modern campus facilities including science laboratories, a library, arts spaces, and sports facilities. Strong university counselling services support students in gaining admission to top universities in the USA, UK, and Europe. ISZ has been serving Zagreb's international community for over 30 years.