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The Overseas School of Colombo

The Overseas School of Colombo

PO Box 9, Pelawatte, Battaramulla, 10120, Sri Lanka

+94 11 2784 920-2



The Overseas School of Colombo
School type Co-educational Day
Founded 1957
Status Private
Head of School Dr. Michelle Kleiss
Language of Instruction English
Co-ed Age Range 3-18 years
Authorised IB Programmes IBDP, IBMYP, IBPYP
Diploma Coordinator William Duncan
MYP Coordinator Jacob Eagle
PYP Coordinator Samantha Wood

The Overseas School of Colombo (OSC) was established in 1957 and is the only IB World School in Sri Lanka. It is Sri Lanka's oldest internationally accredited educational institution – fully accredited by the Middle States Association (MSA) and the Council of International Schools (CIS) – and is authorised by the IB to offer the Primary Years Programme, Middle Years Programme, and the Diploma Programme.

Home to a vibrant student community of over 40 nationalities, OSC is an international family that stays true to its motto – ‘Unity in Diversity’ by fostering intercultural awareness, understanding, and collaboration. With an excellent teacher to student ratio of 1 : 6, learners are guided by exceptional educators from around the world to whom teaching is more a passion than a profession. Our consistent 100% pass rate is a testament to our ethos of continually pushing ourselves to improve, highlighting that there is no limit to what our students can achieve.

OSC is driven by its mission to develop the whole person as a responsible learner, striving for personal excellence within a culturally diverse environment. It strives to be a model of excellence in education and puts a great deal of commitment, passion, and energy into its arts, athletics, design, after-school and co-curricular programmes – thereby holistically nurturing and empowering its community of learners to achieve global success.

OSC is committed to learning that goes beyond the academic life of students and encompasses academic, social, physical and community interests that shape individuals who embrace lifelong learning, with attitudes and values that transcend barriers of race, class, religion, and gender.

OSC’s lush green self-contained campus is equipped with air-conditioned classrooms, 2 libraries, 3 design labs, 4 newly renovated state-of-the-art science labs, specialist rooms for art, drama and music, IT labs, Counselling offices, a 400-seat auditorium, black-box studio theatre, covered primary school playground, cafeteria, and a coffee shop.

Sports facilities include a spacious grass football field, a 25-meter swimming pool, a professional level outdoor basketball court, a gymnasium with a rock-climbing wall, basketball, badminton and volleyball courts, a movement room and cardio/weight room. Additionally, OSC effectively integrates the latest technologies and teaching methods to leverage and enhance student learning and foster creativity, collaboration, and communication within and beyond the classroom.

The Overseas School of Colombo is steadfast in its support of personalised excellence and remains holistic and inclusive while demonstrating a strong ethos towards service and experiential learning.