Great Goddess is the concept of an almighty goddess or mother goddess. Examples include:
Great Goddess hypothesis, a postulated fertility goddess supposed to have been worshipped in the Neolithic era
Great Goddess, referring to Roman goddess Cybele; also associated with Rhea (mother of the gods) and Gaia (mother of the Titans)
Great Goddess, anglicized form of the Latin Magna Dea
Great Goddess, anglicized form of the Sanskrit Mahadevi, the Shakti sum of all goddesses
Magu (deity), a deity in Chinese and Korean myth
Great Goddess of Teotihuacan, an ancient Mesoamerican deity
Great Goddess, also known as the Triple Goddess, an important feminine deity of the Neopagan religion of Wicca