Chthonic (, from Greek χθόνιος khthonios , "in, under, or beneath the earth", from χθών khthōn "earth") literally means "subterranean". The translation of meaning discusses deities or spirits of the underworld, especially in Greek religion. The Greek word khthon is one of several for "earth"; it typically refers to the interior of the soil, rather than the living surface of the land (as Gaia or Ge does), or the land as territory (as khora (χώρα) does). It evokes, simultaneously, abundance and the grave.

Chthonic (sometimes typeset ChthoniC or ChThoniC) is a Taiwanese heavy metal band, formed in 1995 in Taipei. They have been called "the Black Sabbath of Asia." The group incorporates influences from traditional Taiwanese music including the classical Chinese instrument erhu (the band often calls it hiân-á in their native Taiwanese). The band's stated goal is to use their music to bring ancient history and mythology into the modern era via a pan-green focus, especially to build awareness of the myths of Taiwan and tragic events in that country's history (for example, those of the Seediq people).

In Greek mythology, Gaia, ( or ; from Ancient Greek , a poetical form of Γῆ Gē, Ge, "land" or "earth";) also spelled Gaea, was the personification of the Earth and one of the Greek primordial deities. Gaia was the great mother of all: the primal Greek Mother Goddess; creator and giver of birth to the Earth and all the Universe; the heavenly gods, the Titans, and the Giants were born to her. The gods reigning over their classical pantheon were born from her union with Uranus (the sky), while the sea-gods were born from her union with Pontus (the sea). Her equivalent in the Roman pantheon was Terra.