Helliniki Hetaireia Archaiophilon 
Non-profit organization, dedicated to the revival of the traditional Hellenic religion of the Dodecatheon.
http://www.geocities.com/Athens/Delphi/8239/Diipetes Journal 
Diipetes Journal exists since "1991" and promotes in a bimonthly basis the ethnic, polytheistic Hellenic Tradition and Religion. Member of the World Congress Of Ethnic Religions (WCER)
http://members.tripod.com/~Diipetes/
Thiasos Olympikos 
Reconstructionist group dedicated to providing information on ancient Greek worship.
http://home.pon.net/rhinoceroslodge/thiasos.htm
Church of Thessally 
An organization attempting to recreate the ancient belief system. Members undergo training which lasts for at least 4 to 5 years.
http://www.angelfire.com/journal/thessally/
Threskia 
Greek Thelemic tradition.
http://www.geocities.com/athens/olympus/7496/
Hellenion 
An online organization devoted to the practice and study of ancient polytheistic Greek religion.
http://www.hellenion.org/
The Supreme Council of the Gentile Hellenes 
Official site. The SCGH promotes the protection, moral defence and restoration of the ethnic, polytheistic Hellenic religion and tradition.
http://www.ysee.gr/