The Overseas School of Colombo (OSC)

"The Overseas School of Colombo (OSC) stands as one of Sri Lanka's most established international schools, offering families a rigorous, globally minded education in the heart of South Asia."

With a mission rooted in developing internationally aware, lifelong learners, OSC has long served as a trusted educational home for expatriate families, diplomatic communities, and relocating professionals seeking a high-quality English-medium environment for their children. Founded around 1957, OSC carries decades of experience educating the children of international families who come to Colombo from every corner of the world. That depth of history has allowed the school to build strong systems, traditions, and a well-established community culture that newer institutions are still working to develop. Over the years, OSC has grown into a fully accredited institution recognized by both the Council of International Schools and the Middle States Association of Colleges and Schools — two of the most respected accrediting bodies in international education — giving families confidence that the school meets rigorous global standards of academic quality. Academically, OSC offers a comprehensive program spanning from Preschool through Grade 12, providing continuity for children at every stage of their development. The school delivers the full continuum of International Baccalaureate programmes, including the Primary Years Programme for younger students, the Middle Years Programme for early adolescents, and the prestigious IB Diploma Programme for students in the upper secondary years. Alongside the IB framework, the school also incorporates an American curriculum approach, making it particularly well-suited for families with ties to the United States or those seeking a program that blends internationally recognized standards with a familiar American educational structure. All instruction is conducted in English, ensuring that students develop strong academic language skills while engaging with a globally relevant curriculum. OSC's campus is situated in Pelawatte, near Battaramulla, a well-regarded suburban area on the outskirts of Colombo. The location places families within reach of the capital's amenities while offering a setting that supports a focused, community-oriented school environment. For newly arrived expat families navigating the transition to life in Sri Lanka, the campus location provides convenient access to the residential neighborhoods where many international professionals tend to settle. The school's student body reflects the genuinely multinational character that defines a true international school experience. Children arrive from diverse national backgrounds, creating a rich, multicultural community where students naturally develop cross-cultural understanding and global perspectives — qualities that are increasingly valuable in today's interconnected world. OSC is also a U. S. State Department assisted school, a designation that underscores its strong connection to the American diplomatic and expatriate community in Colombo and its adherence to quality benchmarks recognized by the U. S. government. For families relocating to Sri Lanka, OSC offers something that can be difficult to find: a stable, experienced, and accredited institution where children from preschool through high school graduation can receive a world-class education without interruption. Its combination of IB excellence, American curriculum influences, and a welcoming international community makes it a compelling choice for any family making Colombo their home.