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- Aacham Thavir Disabilities Welfare Trust, Chennai
- Aalayam Foundation, Chennai
- Aanand Charitable Trust, Chennai
- AASHA, Chennai
- Aashraya Andhra Mahila Sabha, Chennai
- AATHARRAVHU, Chennai
- Ability Foundation, Chennai
- Academy for Psychotherapists, Chennai
- Academy of Indian Music & Arts, Chennai
- Action Aid India, Chennai
- Action for Child Labour, Chennai
- Acts of Mercy, Chennai
- Adaikalam Trust, Chennai
- Adayar Exnora Womens Guild, Chennai
- AENF – Airman Express Network Foundations, Chennai
- AGAL, Chennai
- Agasthyasamee Educational Society, Chennai
- Agency for Comprehensive Health & Development, Chennai
- Agro Technologists Consultancy, Chennai
- AID – INDIA, Chennai
- AIDCSC – All India Deprived Community Support Centre, Chennai
- Aide Et Action, Chennai
- AIDS Control & Community Education Programme Trust, Chennai
- Aikya – School for Children with Special Needs, Chennai
- AIM for Seva, Chennai
- AIRDC – All India Research & Development Centre, Chennai
- All India Human Rights Watch, Chennai
- All India Movement for Seva, Chennai
- Alternative for India Development, Chennai
- Altrusa International Inc Madras Club, Chennai
- An Open Door, Chennai
- Anandaragam Children Welfare Trust, Chennai
- Anbagam CSI Home for the Aged, Chennai
- ANBAGAM, Chennai
- Anbu Karangal Trust, Chennai
- Annai Anbalayaa Trust, Chennai
- Annai Fathima Child Welfare Centre, Annai Illam, Chennai
- Annai Seva Foundation, Chennai
- Aowaie Free Education Public Service Trust, Chennai
- Arise Public Charitable Trust, Chennai
- AROGYAM, Chennai
- Arunodhaya – Migrant Initiatives, Chennai
- Arvind Foundation, Chennai
- Asha Nivas Social Service Centre, Chennai
- ASHA Project Among the Disabled, Chennai
- Asian Community Health Action Network, Chennai
- Asian Media Information & Communication Centre of India, Chennai
- Asian Network for Innovative Training Trust, Chennai
- Asian Youth Centre, Chennai
- Associated Action for Knowledge & Secure Humanity
