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The Overseas School of Colombo (OSC) strives to be a model of excellence delivering an academically rigorous yet holistic education enhanced by rich co-curricular activities. The “OSC experience” provides an abundance of service-learning activities and projects in support of our vision and mission.

The Overseas School of Colombo (OSC) delivers a holistic, academically rigorous education enhanced by rich co-curricular activities. The “OSC experience” entails an abundance of service learning activities and projects in support of our vision and mission.

With more than 40 nationalities across our school, we are an international family that lives and breathes our motto every day – “Unity 𝘪𝘯 Diversity.” We build intercultural awareness, fluency, and collaboration skills through our curriculum units and project design. The experiential learning opportunities we offer our students instill responsibility, empathy, and sustainable practices in our shared fragile world. To us, teaching is much more than just covering the curriculum objectives; it is shaping a human being to be a contributing citizen – a responsibility we hold dear.




The Overseas School of Colombo is fully accredited with the U.S.-based Middle States Association of Colleges and Schools (MSA) and the Europe-based Council of International Schools (CIS).

Accreditation of this nature is intended to ensure our standards are uniform with the expectations of colleges and universities - as well as other international schools - around the world. Being an accredited school allows automatic acceptance of our reports and transcripts, as they meet mutually agreed high standards. OSC undertakes a regular in-depth review of our school based upon a very comprehensive set of established standards. A visiting team of professional educators is then required to undertake periodic on-site reviews of our self study in order to ensure we are meeting all established standards, and to provide required modifications if indicated.

In addition to working professionally with these two respected accrediting associations, OSC is also fully certified by the International Baccalaureate Organization (IBO) to offer three standardized educational programmes. The Primary Years Programme includes grades pre-kindergarten through grade 5. The Middle Years Programme is for our grade levels of 6 through 10, and the externally-assessed IB Diploma Programme offers a certified diploma for our 11th and 12th grade students. In addition to following a very clearly prescribed set of requirements, the IBO also requires regular periodic assessments by external educational professionals.

As the only internationally accredited school of this nature in Sri Lanka, OSC takes the accreditation process seriously and we enjoy the opportunity to reflect meaningfully on our practices against an international standard.

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