- Aeronautical Society
- Art Club
- Association of Innovation and Design
- Association of Science and Technology
- Automobile Club
- Buddhist Students’ Association
- Canto Perpetua Choir
- Carnatic Orchestra
- Classical Music Association
- Commerce Society
- Cubing Society
- Culinary Arts Society
- English Drama Society
- English Lit & Debating Society
- Gavel Club
- Geography Society
- Health Club
- Hewisi Band
- Hindu Students’ Union
- Histoarcheo Club
- HNB Students’ Savings Unit
- ICT Society
- Interact Club
- Islamic Society
- Junior English Lit & Debating Society
- Junior Maths Society
- Junior Science & Technology
- Kennel Club
- Media Unit
- Photographic Club
- Political Science Society
- Productive Citizenship Society
- Quiz Club
- Scuba Diving Unit
- Radio Club
- Red Cross Society
- Road Safety Patrol
- Senior Environmental Club
- Seylan Bank Students’ Savings Unit
- Sinhala Literary & Debating Society
- Society for Social Work & Welfare
- Spelling Union
- Student Christian Movement
- Tamil Drama Society
- Tamil Literary and Debating Society
- The Ternion
- Thomian Union
- United Nations Club
- Western Band
- Wildlife Society
Senior Environmental Club
The official name of the club shall be the Senior Environment Club of S.Thomas’ College Mount Lavinia. The objective of this club is to enable students to develop deeper environmental awareness and engagement, assist in their academic and professional development, and work towards environmental betterment and it has members comprised of students from the Lower Fourth Form to the Upper Sixth form who are interested in the Environment.Latest Project
Debate on 'is it ethical to use animals for testing
A debate was organized on behalf of the world environment day. The topic of the debate was 'Is it ethical to use animals for testing' .This debate was held among our M6&L6 Students and Mrs.Inoka Muthuthanthri was invited as the judge for this event. the proposing team was able to eliminate the opposing team succesfully and both teams were awarded with E-Certificates for participating.