Dagda (Cian)
The god who was the supreme head of the People of Dana. (The equivalent of Cronus.) Dagda possesses a bottomless cauldron of plenty and rules the seasons with the music of his oaken harp. With his mighty club Dagda can slay nine men with a single blow, and with its small end he can bring them back to life. He was father to Brigit, Angus, Mider, Ogma, and Bobd the Red.
Dairé of Cualgne
Owner of the Brown Bull.
Damona
(Gaul) Goddess of cattle and of fertility and healing; her name means "divine cow".
Dana (Danu)
The goddess from whom Tuatha Dé Danann (The People of Dana) were descended. She was the daughter of the god Dagda (the Good), and had three sons, who had only one son between them, Ecne (Knowledge). She was another of the three war goddesses known collectively as the Morrigan.
Dechtere (Dechtiré)
(Irish) The mother of Cuchulain. There are a number of versions of his birth, of which two follow: one, Dechtere accidentally swallowed a mayfly while drinking a cup of wine, became pregnant from this event, and bore Cuchulain; two, She was impregnated by the god Lugh with his own soul, and vomited him into life as Cuchulain, thereby remaining a virgin.
Deidre
Deidre was the beautiful intended bride of Conchobar. She ran off with No? (Naoise), and died of sorrow when Conchobar killed him and his brothers.
Derbforgaille
Daughter of the king of Lochlann left as a tribute to the Fomorii and rescued by Cuchulainn. She fell in love with him, and decided to follow him. To do this she turned herself into a swan. The hungry Cuchulainn spotted the swan and shot it down with his slingshot. She returned to human form and Cuchulainn sucked out the stone so she would heal. But now they were linked by blood and forbidden to marry.
Dewi
(Wales) The Red Dragon god. The emblem of Wales.
Dia Griene
(Scotland) The daughter of the sun in ancient Scotland. She appears in a folktale in which, held captive in the Land of the Big Women, she is freed by the Cailleach, disguised as a fox, and a helpful young bumbler named Brian.
Diancecht
(Irish) Diancecht is the god of healing. He killed the giant serpent that was destroying cattle throughout the land. He also killed his own son whose skill in healing endangered his father's reputation. He is the one who fashioned a fully functional arm of silver for Nuada.
Dil
(Ireland) Goddess of cattle.
Domnu
Mother goddess of the Fomors.
Dön
(There are two differing versions of Celtic Mythology with one of them probably based on the Welsh people's tales.)
1. Don, the mother goddess; the Welsh equivalent of the Irish Danu (Dana). She was wife to Beli, god of death. They had many children, including Amaethon, Arianrhod, Gilvaethwy, Govannon, Gwydion, and Nudd.
2. According to the predominant story, Dön was the leader of one of the two warring families of gods. His children were the powers of light, the other family's children were the powers of darkness.
Donn
(Ireland) God of the dead. His name means "the dark one".
Druantia
Goddess of fir trees.
Dubh
An Irish druidess. Her husband Enna became involved with another woman. She drowned that woman. Her husband drowned her. Where he drowned her became known as Dubhlinn (Dubh's pool); now known as Dublin.
Dylan
(Wales) A sea god, son of Arianrhod and Gwydion. Upon his birth he dove into the sea and immediately could swim as well as any fish. He was later killed by his uncle Govannon.

Eadon
(Ireland) Goddess of poetry.
Elathan
A king of the Fomors.
Elen
(Wales) In the Mabinogian, the Welsh mythic epic, this heroine appears as the world's first highway engineer. When her land was threatened, she magically built highways across the country so that her soldiers could gather and defend it.
Ellylion
The Welsh elves.
Emer
(Irish) An exceptionally beautiful, and intelligent, woman who knew it! Before she would allow the hero Cuchulain to sleep with her she demanded a number of heroic tasks be successfully completed, reasoning that her superior endowments warranted it.
Epona
The horse goddess. Usually portrayed as riding a mare, sometimes with a foal.
Erc
A king of the Fir Bolgs at Tara.
Eremon
First king of Ireland.
Eri
(Irish) The mother of Bres.
Eriu
(Irish) The goddess for whom Ireland is named. In Gaelic Ireland is rendered as Erin, which means the "land of Eriu".
Esus
(Gaul) God equated with either Roman deity Mars or Mercury. Human sacrifices to Esus were hanged and skewered with a sword. Esus is usually pictured as a woodcutter. His sacred animal was the bull.
Etain
(Irish) An early sun goddess of ancient Ireland and wife to Mider.
Etan
Wife of Ogma.
Ethne
(Irish) An ancient Irish goddess that subsisted on the milk from a sacred cow from India.
Ethniu
Daughter of Balor