- Rural Education & Development Society, Trinelveli
- Rural Education Awareness & Development Society, Tirunelveli
- Rural Reconstruction Organisation, Tirunelveli
- S. Paripooranam Educational Trust, Tirunelveli
- SASCV – South Asian Society of Criminology & Victimology, Tirunelveli
- Shalom Charitable Trust, Trinelveli
- SIVA – Service Initiative for Voluntary Action Trust, Tirunelveli
- Social Changes & Reconstruction, Tirunelveli
- SPET – S.Paripooranam Educational Trust, Tirunelveli
- Sri Kanyakumari Gurukula Ashram, Tirunelveli
- Sri Poorana Pushpakala Trust, Tirunelveli
- St. Mary’s Educational Social Development Society, Tirunelveli
- STWAAS – Save the Water Air and Soil, Tirunelveli
- Swaas Trust, Tirunelveli
- SWAN Trust – Society for Weak & Needy, Tirunelveli
- SWASAM, Tirunelveli
- Tamiraparani Research in Environment & Education Trust, Tirunelveli
- The Mother Teresa Memorial Social Welfare Trust, Tirunelveli
- TRUE – Trust for Rural Uplift & Education, Tirunelveli
- Turning Point Foundation, Tirunelveli
- Wind Trust, Sankarankovil
- Women Welfare Trust, Tirunelveli
- Youth Welfare Development Educational & Charitable Trust, Tirunelveli
