- Oriental Dancing Society
- Philatelic & Numismatic Society
- Robotics Club
- Yoga Club
- Library Club
- Environmental Club
- College Magazine
- Chamber Orchestra
- Cinema Society
- Astronomy Club
- Aquarium Club
- Scuba Diving Unit
- Culinary Arts Society
- Aeronautical Society
- Junior Science & Technology
- Histoarcheo Club
- Geography Society
- Gavel Club
- Student Christian Movement
- English Lit & Debating Society
- Radio Club
- Junior Maths Society
- Road Safety Patrol
- Sinhala Literary & Debating Society
- Seylan Bank Students’ Savings Unit
- HNB Students’ Savings Unit
- Kennel Club
- Junior English Lit & Debating Society
- Buddhist Students’ Association
- Art Club
- Spelling Union
- Carnatic Orchestra
- Canto Perpetua Choir
- Western Band
- Tamil Drama Society
- English Drama Society
- Hewisi Band
- Photographic Club
- Society for Social Work & Welfare
- ICT Society
- Senior Environmental Club
- Hindu Students’ Union
- Political Science Society
- Association of Innovation and Design
- Red Cross Society
- Islamic Society
- Automobile Club
- Association of Science and Technology
- Quiz Club
- Cubing Society
- Health Club
- Tamil Literary and Debating Society
- Wildlife Society
- Commerce Society
- Interact Club
- Thomian Union
- The Ternion
- Media Unit
- Classical Music Association
- Productive Citizenship Society
- United Nations Club
United Nations Club
The United Nations Club of S.Thomas' College Mount Lavinia in the past decade has revolved around helping the community of Sri Lanka to its utmost effort by serving the community at large in accordance with the United Nations Charter and Millennium Development Goals. The club has tackled different issues pertaining to various rural locations of Sri Lanka by organizing community service projects and health camps.The club has been able to serve less fortunate communities and organize the afore mentioned projects through its main fundraiser titled 'Xtaztic'
Latest Project
E Rush
A Virtual competition with the basis being an online amazing race.