- Society for Indian Children’s Welfare, Kolkata
- Society for Love in Action, Kolkata
- Society for Movement of Human & Democratic Rights, Kolkata
- Society for Student Empowerment Rights & Vision through Education, Kolkata
- Society for the School of Medical Technology, Kolkata
- Society Midas Barrackpore, Kolkata
- Socio Economic Development Organisation, Kolkata
- Socio Economic Development Programme, Kolkata
- Socio Legal Aid Research & Training Centre, Kolkata
- Sonar Bangla Bijnan Sanchar Gabesana Samiti
- Sonarpur Spiritual Foundation, Kolkata
- Sonarpur Sukhinir, Kolkata
- Sonorous, Kolkata
- Soul, Kolkata
- South Asian Forum for Environment, Kolkata
- South Asian Foundation for Human Initiatives, Kolkata
- SPAN – Society for Peoples Awareness, Kolkata
- SPAR – Society for Participatory Action & Reflection, Kolkata
- Speech & Hearing Institute & Research Centre, Kolkata
- SRDTC – Sundarban Rural Development & Training Centre, Kolkata
- Sreenagar Tisa Urban & Rural Development Society, Kolkata
- Sri Joydip Ashram, Kolkata
- Sri Ramakrishna
- Sruti Disability Rights Centre, Kolkata
- SSWARG – Society for Social Welfare & Rational Growth, Kolkata
- Starve Prevent Foundation, Kolkata
- State Remote Sensing Centre, Kolkata
- Subhash Chandra Human Research & Development Foundation, Kolkata
- Subho Swapno International Educational Development Charitable Trust, Kolkata
- Sulabh International Social Service Organisation, Kolkata
- Sunshine Team, Kolkata
- Suvidha Welfare Society, Kolkata
- SWADHINA, Kolkata
- Swargiya Sunil Bihari Dastider Smritirakshya Samiti, Kolkata
- Swasthya Unnayan for Nation, Kolkata
- SWAYAM, Kolkata
- Tagore Society for Rural Development, Kolkata
- Tangra Art & Welfare Foundation, Kolkata
- Tangra Spandan Amnesty Society, Kolkata
- TEACH – The Educators Assisting Children Hopes, Kolkata
- Technology Popularisation Society, Kolkata
- Teghoria Shiksha Bikash Bharati Social Welfare Society, Kolkata
- TEWS – Tiljala Education & Welfare Society, Kolkata
- TEWS, Kolkata
- Thakurpukur Love & Care Society, Kolkata
- Thakurpukur Naba Shristi, Kolkata
- Thalassaemia & Aids Prevention Society, Kolkata
- The Educators Assisting Children’s Hopes, Kolkata
- The Genesis Foundation, Kolkata
- The Global Institutes, Kolkata
