International School Brunei (ISB) is an international school in Brunei. It is split over two sites, one in the Sungai Akar area of Bandar Seri Begawan, and a second in Seria in the Belait district. The current executive principal is Dominic Morley. The school has four sections: pre-kindergarten, kindergarten, primary, and secondary. The school is one of several schools offering the Cambridge IGCSE qualification in Brunei and was the first of the two schools in the country to offer the IB Diploma.

Notable alumni