Pelawatte, Battaramulla, Colombo, 10120, Oeste, Sri Lanka.
Pelawatte, Battaramulla, Colombo, 10120, Oeste.
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| Scope | Private |
| Faith | Secular |
| Differentiation | Coed |
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General Curriculum |
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The Overseas School of Colombo (OSC) is a non-profit, coeducational, English-medium international day school in Battaramulla, on the eastern side of Colombo, Sri Lanka. Founded in 1957 by members of diplomatic missions and the business community as the Colombo School for Overseas Children, it adopted its present name in 1996 and has occupied its six-acre Pelawatte campus, designed by the architect Geoffrey Bawa, since the 1980s. The 2026-27 school profile reports 330 students of 35 nationalities (the website speaks of more than 40) and 58 educators, with a teacher-student ratio of about 1:6. OSC presents itself as the only school in Sri Lanka offering the complete International Baccalaureate continuum: the Primary Years Programme from Early Years to Grade 5, the Middle Years Programme in Grades 6 to 10 and the Diploma Programme, taught since 1983, in Grades 11 and 12. It is accredited by the IB, the Council of International Schools and the Middle States Association, and belongs to SAISA, NESA and ECIS. Children join from the age of three and continue to Grade 12. The school has a strong sustainability profile: it was the first in Sri Lanka to earn the Eco-Schools Green Flag in 2022 and received an MSA distinction in sustainability in 2024. There is no boarding and no school uniform apart from PE kit, and a user-pay bus service is available.
Educational System of The Overseas School of Colombo
Method
Pedagogical method general Curriculum
School values
OSC sums up its mission in three words: compassion, courage and curiosity. Its motto, Unity in Diversity, reflects a community drawn from many countries that wants every student to feel known, respected and supported. As an IB continuum school it uses the IB Learner Profile to encourage international-mindedness, critical thinking and responsible action, and uses Positive Discipline and restorative practices. The school also defines itself as an eco-school, placing sustainability, service to the local community and care for the environment at the centre of school life.
Number of Students: 330
PTA
Tutoring
Tracksuit
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Attention to Diversity at The Overseas School of Colombo
Attention to diversity
Educational Stages of The Overseas School of Colombo
Nursery
Preschool
Primary
Middle School
High School
Vocational Training
Information about the educational stages of the The Overseas School of Colombo
OSC is organised in a Primary School and a Secondary School. The Primary School runs from Early Years 1 (age three) and Early Years 2 through Kindergarten to Grade 5 and follows the IB Primary Years Programme through units of inquiry. The Secondary School runs from Grade 6 to Grade 12: Grades 6 to 10 follow the IB Middle Years Programme, and Grades 11 and 12 follow the IB Diploma Programme with Theory of Knowledge, the Extended Essay and CAS. Students who do not take the full Diploma can graduate with the OSC high school diploma, which requires 24 credits.
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Languages and International Programs at The Overseas School of Colombo
Spanish (Half)
English (Instructional)
French (Half)
Mandarin (Essential)
Information about languages of the The Overseas School of Colombo
English is the main language of instruction; multilingual learners receive specialist English as an Additional Language support. From Grade 1 every student studies at least one additional language. Children begin Sinhala through cultural immersion in the Early Years and Kindergarten and then choose Sinhala or French from Grade 1 to Grade 5; Spanish is added as an option from Grade 6. In the Diploma Programme, recent results include French B, French ab initio, Spanish B and Mandarin ab initio, plus self-taught Hindi and Spanish literature. Paid home-language lessons are arranged where possible.
IB (International Baccalaureate)
Montessori Model United Nations (MMUN)
Information about international degrees and programmes of the The Overseas School of Colombo
OSC is authorised for the whole IB sequence. The Primary Years Programme reaches from pre-kindergarten to Grade 5, the Middle Years Programme spans Grades 6 to 10, and the two-year Diploma occupies Grades 11 and 12, having been offered here since 1983. Admission to the Diploma is deliberately open rather than selective: any student who wants the challenge is supported through it. Students who take DP courses without sitting the full Diploma can still qualify for the school's own high school diploma, which is credentialed in the United States by the Middle States Association.
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Extracurricular Activities at The Overseas School of Colombo
Arts activities
Music
Singing
Art
Theater
Sports activities
Athletics
Football
Basketball
Swimming
Volleyball
Badminton
Cultural activities
Robotics
Information about extracurricular activities of the The Overseas School of Colombo
After-school activities run on weekdays for Grades 1 to 12. Students can take part in swimming, football, basketball, badminton, volleyball and athletics, and OSC competes regionally in SAISA and locally in the TISSL league. The arts programme includes theatre productions and ISTA events, drama, choirs, music ensembles, instrumental performance, private music lessons and visual arts exhibitions. OSC founded the Colombo Operated Model United Nations (COMUN) in 1994. Other options include the Duke of Edinburgh's International Award, the Student Government Association, robotics, a maths club and over fifteen service groups, as well as the Experience Sri Lanka week without walls.
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Services and Facilities of The Overseas School of Colombo
Dining room
Dining room - External catering
Bring food from home
Other services
School transport
School nurse
Field trips / retreats
Scholarships
Security
Information about the services offered by the The Overseas School of Colombo
OSC runs a user-pay bus service with paid adult bus monitors. Students can buy lunch in the canteen or bring a packed lunch. A full-time doctor works on site, with a medical room that includes an isolation area. Learning Support Services, supervised by a Director of Student Support, provide personalised learning plans and specialist EAL teaching, and counsellors support academic, career and social-emotional development. A financial assistance programme helps families facing a change in circumstances. The Gecko Community Network brings parents together.
Facilities
Swimming pool
Sports hall
Gym
Climbing wall
Football pitch
Basketball court
Facilities
Music room
Laboratory
Technology Workshop
Green-screen room
Art room
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Maker space
Library
Facilities
Medical room
Facilities
Children's playground
Other facilities
Multipurpose/conference room
Vegetable garden
Information about the facilities of the The Overseas School of Colombo
OSC's self-contained, six-acre campus in Battaramulla, about eight kilometres from central Colombo, was designed by Geoffrey Bawa and consists of six air-conditioned buildings with 48 general classrooms. There are four science laboratories, a product design lab, a digital design lab, a primary maker space with a green screen, two libraries with more than 25,000 volumes, specialist art, drama and music rooms. The auditorium complex seats over 450 people and there is also a black box theatre. The Sports Centre has a climbing wall and indoor courts, alongside a 25-metre pool, an outdoor FIBA-approved basketball court, a playing field, a weight room, playgrounds and permaculture gardens.
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