Gaia South, Inc. is a professional service organization seeking to promote the concept of environmentally sustainable development. Gaia, in ancient  Greece, was the Goddess of the Earth. South refers to developing countries, such as the Philippines, seeking to take off from their current economic situation but with awareness of the sound principle of environmentally sustainable development.

Gaia South was incorporated in 1992, in accordance with the Corporation Code of the Philippines.

Gaia South principals include former officials of the Department of Environment and Natural Resources (DENR) who, because of their wide experience in sustainable development policy formulation and implementation, coupled with many years of practice in the field of environmental consultancy, are foremost experts on the field. Gaia South has expert in-house technical staff and support personnel who provide the day-to-day services for various projects. It also maintains a pool of specialized consultants, largely university-based.

As an Environmental Impact Assessment (EIA) consultancy firm, the company has prepared EIA Reports for numerous clienteles in various industries including mining and heavy industries, cement, housing, airport, petroleum, power, telecommunication, and tourism projects, among others.