The International School of Budapest (abbreviated ISB, Hungarian: Budapesti Nemzetközi Iskola) is an international school, currently located in District XI of Budapest, Hungary. It is the third most expensive private school in Budapest. Established in 1996, the school follows the British National Curriculum and offers both Hungarian-English bilingual and British English-language educational programs. It is maintained by the International Education Centre Foundation.
Until 2023, the school was located in Csillebérc, in Budapest's District XII (Hegyvidék), one of the city's most affluent and prestigious residential areas. During this period, the school attracted children from prominent and affluent families in Hegyvidék and elsewhere in Budapest and was regarded as a school serving a socially and economically elite segment of the city's population.
In 2023, the school relocated to District XI. Around the time of the relocation, Nakama & Partners Kft. acquired a 57% stake in the school after moving to Újbuda. The school has also been associated with prominent Hungarian public figures, including Vivien Vasvári and Ildikó Tóth, who enrolled their children there.
Since 2025, the school has been led by Karin Wouters as head of school. In 2023, ISB relocated to a new campus in District XI, provided by the IT Campus, which includes modern facilities such as a gymnasium, café, and restaurant. The campus is shared with János Kodolányi University. As of 2025, the International School of Budapest ranks as the third most expensive private school in Hungary, following the American International School of Budapest and the British International School Budapest.
Curriculum Early childhood education at the school is based on the standards of Hungarian state kindergartens. From Grade 1 to Grade 8, students follow either a bilingual Hungarian-British English program or a British English-only program, with the latter being the preferred option.
In the upper secondary school, students are prepared for the International General Certificate of Secondary Education (IGCSE) examinations. Since 2020, the school has also offered the International Baccalaureate (IB) Diploma Programme, as well as the IB Certificate Programme for students not enrolled in the full diploma track.
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