"the mastic villages" in English) is a former municipality on the island of Chios (Χίος), North Aegean, Greece.

Founded in 1938, the Chios Gum Mastic Growers Association (Greek: Ένωση Μαστιχοπαραγωγών Χίου), abbreviated CGMGA, is a cooperative organisation and acts as the collective representative organ of twenty primary cooperatives totalling nearly 5000 members in the twenty-four villages of southern Chios.

The organisation is mainly involved with the management of the agricultural production, supporting local growers, stimulating research, and providing legal assistance.

Three members are permanent: these are the Director of the Agricultural Service, the technical supervisor of the ATE bank and the Commissioner of NCGAC.

It offers a permanent exhibition about mastiha production on the island, explaining its history and cultivation techniques as well as demonstrating its different uses today.