The International Geothermal Association (IGA), founded in 1988, is a scientific, educational and cultural organization established to operate worldwide. It has nearly 5,000 members in over 65 countries.

The IGA is a non-political, non-profit, non-governmental organization with special consultative status to the UN and special observer status to the Green Climate Fund. The objectives of the IGA are to encourage research, the development and utilization of geothermal resources worldwide through the publication of scientific and technical information among the geothermal specialists, the business community, governmental representatives, UN organisations, civil society and the general public.