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Sri Lanka, Colombo
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OSC offers a broad range of after-school activities that extend learning beyond the classroom. AMC Math Club, Linguistic Adventures, and other ASA options provide opportunities to practice problem solving, language analysis and critical thinking. COMUN leadership and SAISA preparation extend learning beyond the classroom through leadership development and regional competitions. Most activities take place after school, with some during lunch, and many are year-long commitments.
OSC offers a broad arts program spanning performing and visual arts. There are after-school ensembles and groups such as Percussion Ensemble, Senior Vocal Group, Broadway Singers, Guitar Ensemble, Primary Art Studio and Secondary Art Club. Productions are staged biannually for secondary and primary, and the school participates in ISTA and SAISA festivals. OSC also offers private music instruction in piano, drums, classical guitar, bass guitar, electric guitar, clarinet, flute and saxophone.
OSC offers cultural and language clubs including French Club, Chinese Culture Club and Spanish Club. Linguistic Adventures explores language analysis using digital tools. These activities form part of OSC's after-school life and contribute to its cultural and language learning ecosystem.
OSC's secondary after-school activities include a wide range of social and hobby clubs such as AMC Math Club, Art Club, COMUN, Concert Band, Broadway Singers, French Club, Dungeons and Dragons, Minecraft, Student Newspaper, Yearbook, and The Advocate Literary Magazine. There are also informal sports and games, including cricket, badminton and ultimate frisbee, alongside SAISA sports like swimming, basketball, volleyball and football. Leadership opportunities include the Duke of Edinburgh Award and various student-led initiatives and publications, such as COMUN and OSC's student media.
CAS is a vital component of the IB Diploma Programme at OSC, encompassing Creativity, Activity and Service. Community service and service-learning have a special place in OSC's philosophy of education. Some CAS activities occur weekly (Thursday afternoons) after school, while others are part of the Week Without Walls program. DP students lead service projects and collaborate with local charities, and have organized activities such as medical clinics and recycling programs.
The Duke of Edinburgh Award program is offered at OSC to recognize student participation in extracurricular activities. Bronze Award is being introduced for Grades 9-12, with Silver and Gold planned for later years; participants complete four segments: Physical Recreation, Skills, Service and Adventurous Journey. Some DOE segments are addressed within other ASAs, and the Adventurous Journey includes weekend trips. COMUN provides leadership opportunities for OSC students, and students also gain leadership and professional experience through publications like the Student Newspaper, the Advocate Literary Magazine and Yearbook.
OSC promotes wellbeing through sports and physical activities, including SAISA participation and informal sports such as cricket, badminton and ultimate frisbee. Mindfulness and relaxation are supported by Meditative Coloring as an after-school activity. Practical skills and fitness are developed through Bike Maintenance, which covers brakes, drive train and wheel safety. Swimming and other wellness-oriented activities are part of the after-school program and events.
Founded more than 65 years ago, the Overseas School of Colombo is a non-profit, co-educational English-medium day school serving ages 3 to 18. It offers the International Baccalaureate continuum—PYP for Early Years to Grade 5, MYP for Grades 6–10, and the Diploma Programme for Grades 11–12—with self-taught mother-tongue support and online Pamoja options. OSC is the only IB World School in Sri Lanka. The school's motto, Unity in Diversity, guides a holistic, inquiry-based approach; the curriculum emphasizes international-mindedness, learner ownership, and, in the DP, Theory of Knowledge, the Extended Essay and CAS. The five-acre, green campus houses six buildings, four science labs, three design labs, two libraries with over 25,000 volumes, and extensive arts and IT facilities, plus a 25-metre pool, gym, auditorium, and multiple playing fields. A broad after-school program includes AMC Math Club, Linguistic Adventures, COMUN, and SAISA, with service learning through CAS and Week Without Walls.
