Overseas School of Colombo

Founded more than 65 years ago, the Overseas School of Colombo is a non-profit, co-educational English-medium day school serving ages 3 to 18. It offers the International Baccalaureate continuum—PYP for Early Years to Grade 5, MYP for Grades 6–10, and the Diploma Programme for Grades 11–12—with self-taught mother-tongue support and online Pamoja options. OSC is the only IB World School in Sri Lanka. The school's motto, Unity in Diversity, guides a holistic, inquiry-based approach; the curriculum emphasizes international-mindedness, learner ownership, and, in the DP, Theory of Knowledge, the Extended Essay and CAS. The five-acre, green campus houses six buildings, four science labs, three design labs, two libraries with over 25,000 volumes, and extensive arts and IT facilities, plus a 25-metre pool, gym, auditorium, and multiple playing fields. A broad after-school program includes AMC Math Club, Linguistic Adventures, COMUN, and SAISA, with service learning through CAS and Week Without Walls.