Regional Science Association International (RSAI) is composed of four supraregional groupings of individual national and international sections or associations: The European Regional Science Association (ERSA), The North American Regional Science Council (NARSC), The Pacific Regional Science Conference Organisation (PRSCO) and The Latin America Regional Science Association (LARSA). RSAI has a world-wide membership of over 4,000.

The initial part of the Regional Science Association International was founded in 1954 to promote the free exchange of ideas and viewpoints related to regional science.

RSAI membership is drawn from all parts of the world, and includes people from a wide range of academic disciplines and professions who share an interest in spatial issues.