People's Science Institute (PSI) is a non-profit research and development organization. Its stated mission is, “To help eradicate poverty through the empowerment of the poor and the productive, sustainable and equitable use of available human and natural resources.” Operationally, it provides technical and managerial support to communities and organizations that work with them; implements development programmes and undertakes public interest research.

The Institute is known in India's voluntary sector for its pioneering work in the fields of community-led watershed development, environmental quality monitoring and disaster-safe housing.