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. Our small class sizes allow for personalised attention and our warm and friendly relationships provide positive and trusting teacher-student rapport.

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 instil responsibility, empathy, and sustainable practices in our
co-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.

School Motto:

Unity in Diversity

Our students and teachers greatly appreciate the richness and heritage of Sri Lankan culture because our commitment to international education starts with the understanding that we have to know our local context and culture before we can appreciate someone else’s.

Dr Michelle Kleiss
Head of School

Accreditation and Memberships

The Overseas School of Colombo (OSC) is dually accredited by the Middle States Association of Colleges and Schools (MSA) and the Council of International Schools and authorised by the International Baccalaureate (IB). We have full membership status with the Near-East and South Asia (NESA) Association of International Schools, the Educational Collaborative for International Schools (ECIS), the Association for the Advancement of International Education (AAIE), the Principals' Training Centre (PTC), and are also part of the South Asian Interscholastic Association.

OSC fulfilled all standards of reaccreditation and reauthorisation from Middle States Association of Colleges and Schools (USA), Council of International Schools (Netherlands) and International Baccaleaurate (Geneva) during its 5 day, 3-agency visit in February 2020.

Middle States Association

Council of International schools

International Baccaleaurate

Our triple accreditation process is rigorous and based on top notch standards of international schools. The standards cover critical areas of governance, finance, staffing qualifications, academic program and results, pedagogical practices, student life, health and safety, operations, facilities, and more.

We are the only 3-program continuum IB World School in Sri Lanka authorised to offer all three programs, PYP, MYP and DP.