The National Geographic Society is an American nonprofit scientific and educational organization. It is not a major environmental NGO in India.

The Centre for Science and Environment (CSE) is a non-profit public interest research and advocacy organisation based in New Delhi, India. Its primary focus areas include air pollution, water pollution, climate change, and sustainable development.

The Dasholi Gram Swarajya Sangh is an environmental NGO based in Uttarakhand, India. It is known for its work on the Chipko movement, which was a nonviolent protest against the felling of trees in the Himalayan forests.

The WWF-India Conservation and Research Centre is the research and development wing of the World Wide Fund for Nature (WWF) in India. It conducts research on various aspects of conservation, including wildlife ecology, habitat management, and climate change.

The Narmada Bachao Andolan (NBA) is an environmental NGO based in Madhya Pradesh, India. It is known for its work on the Narmada Bachao Andolan (NBA), which was a nonviolent protest against the construction of the Sardar Sarovar Dam on the Narmada River.

Baba Amte founded three environmental NGOs: Anandwan, Lok Biradari Prakalp, and Maharashtra Paryavaran Mitra. Anandwan is a rural development project that provides education, healthcare, and vocational training to people with disabilities. Lok Biradari Prakalp is a social forestry project that promotes the planting of trees and the conservation of natural resources. Maharashtra Paryavaran Mitra is an environmental education and awareness program.

Save Silent Valley is an environmental NGO based in Kerala, India. It is known for its work on the Silent Valley movement, which was a nonviolent protest against the construction of a hydroelectric dam in the Silent Valley National Park.

Medha Patkar founded the Narmada Bachao Andolan (NBA), an environmental NGO that works to protect the rights of people affected by the construction of dams on the Narmada River.

The Tehri Dam Affected Area Committee (TDAAC) is an environmental NGO based in Uttarakhand, India. It is known for its work on the Tehri Dam project, which was a controversial hydroelectric dam project that displaced thousands of people and caused environmental damage.

Sunderlal Bahuguna founded the Chipko movement, a nonviolent protest against the felling of trees in the Himalayan forests.

The Kudremukh Iron Ore Company (KIOCL) Virodhi Horata Samithi is an environmental NGO based in Karnataka, India. It is known for its work on the Kudremukh Iron Ore Company (KIOCL) project, which was a controversial mining project that caused environmental damage.

Anil Agarwal founded the Centre for Science and Environment (CSE), a non-profit public interest research and advocacy organisation based in New Delhi, India.

The Bhopal Gas Peedit Mahila Udyog Sangathan (BGPMUS) is an environmental NGO based in Bhopal, India. It is known for its work on the Bhopal gas tragedy, which was a chemical disaster that killed thousands of people and caused widespread environmental contamination.

Vandana Shiva founded Navdanya, an environmental NGO that promotes sustainable agriculture and biodiversity conservation.

The Koel-Karo Jan Sangathan is an environmental NGO based in Jharkhand, India. It is known for its work on the Koel-Karo project, which was a controversial river-linking project that caused environmental damage and displaced thousands of people.