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- Public Welfare and Development Socoiety, Chennai
- Pursuers for Reforming India, Chennai
- Rajiv Medical & Educational Trust, Chennai
- Ramanujan Museum & Math Education Centre, Chennai
- REACHER, Chennai
- Real Charitable Trust, Chennai
- Richard’s Memorial Trust, Chennai
- RISE, Chennai
- RMD Pain & Palliative Care Trust, Chennai
- Road Guru Trust, Chennai
- Sailors Helpline, Chennai
- SAIMED – Sri Sairam Medical & Educational Centre Trust, Chennai
- SAMRAKSHANA, Chennai
- Sanctuary of Living Springs Sols, Chennai
- Sanjeevan Trust, Chennai
- Sanju Women’s Welfare Association, Chennai
- Sankara Eye Hospital, Chennai
- SEEDS, Chennai
- SEERS – Socio Economic Education & Rehabilitation Society, Chennai
- Service & Research Foundation of Asia on Family & Culture, Chennai
- Service & Research Institute on Family & Children, Chennai
- Service and Research Institute on Family and Children, Chennai
- Sevai Social Service Trust, Chennai
- Sevaman Educational Trust, Chennai
- Shabnam Resources, Chennai
- Shelter Aid Charitable Foundation, Chennai
- Shine Child and Women Welfare Trust, Chennai
- Shine Foundation, Chennai
- SHORE – Society of Hope for Ostracized to Rehabilitate & Educate, Chennai
- Shoshin Kai Academy, Chennai
- SIAAP – South India AIDS Action Program, Chennai
- Siddhargal Jnana Peetam Trust, Chennai
- Singhvi Charitable Trust, Chennai
- SIPA – Federation of South India Producer Associations, Chennai
- Skenterprises, Chennai
- Slum Development Society, Chennai
- Smile Cares Charitable Trust, Chennai
- SMILE, Chennai
- SNEHA, Chennai
- Social Service Trust, Chennai
- Social Welfare & Consultancy Services, Chennai
- Social Welfare Centre for Weaker Sections, Chennai
- Social Welfare Funds trust, Chennai
- Society Charitable Foundation, Chennai
- Society for Integrated Development, Chennai
- Society for Protection of Unborn Child, Chennai
- Society for Social Education & Development, Chennai
- Society for the Prevention of Cruelty to Animals, Vepery
- Society for Urban & Rural Poor, Chennai
- Society of Daughters of Mary Immaculate & Collaborators, Chennai