The Grantham Foundation for the Protection of the Environment is a private philanthropic foundation established in 1997 by Jeremy and Hannelore Grantham. Its mission is to protect and conserve the natural environment through communication, collaboration, philanthropy, and investment. The foundation is primarily funded by the Granthams, who have committed around $1 billion to address global warming and environmental issues.

The foundation focuses on advancing environmental and climate solutions by supporting scientific research, public advocacy, and innovation in green technologies. It provides grants to journalists, NGOs, and grassroots organizations to promote environmental awareness and research. The foundation also invests in early-stage climate technologies through its environmental venture capital vehicle, Neglected Climate Opportunities LLC. It collaborates with a wide range of environmental organizations and academic institutions, including the Grantham Institute and the World Wildlife Fund, to drive impactful initiatives in climate change and sustainability.