Twenty of the Tuatha Dé Danann, the folk of the goddess. None of them was written down by anyone who worshipped them: every word comes from Christian monks, who turned the gods into an ancient people. So this page says what the texts say, and marks where "goddess of" is a guess.
Goddesses
Gods
The Irish answers. Lists of "Celtic" gods usually give Welsh or Gaulish ones here.
an Daghdha · the good god
The father-figure of the Tuatha Dé Danann, a king and druid, usually a huge bearded man in a hooded cloak. He owns a staff that kills with one end and brings back to life with the other, a cauldron that never runs empty, and a harp that flies to him when he calls it by its names. He is said to live in Brú na Bóinne, Newgrange.
an Mhór-Ríon · great queen, or phantom queen
She appears over battlefields as a crow, urges warriors on, terrifies their enemies, and is seen washing the bloodstained clothes of men who are about to die. She is often one of three sisters, the three Morrígna, with Badb and Macha. She is also said to be the Dagda's wife.
Bríd · exalted one
Daughter of the Dagda. The 9th-century Cormac's Glossary calls her 'the goddess whom poets adored' and gives her two sisters, Brigid the healer and Brigid the smith, which is why she is often called a triple goddess.
Lú
Lámhfhada, of the long arm, and Samhildánach, skilled in many arts at once. He comes to Tara claiming every skill there is, leads the Tuatha Dé against the Fomorians at Mag Tuired, and kills Balor, his own grandfather. Lughnasa, the harvest festival at the start of August, carries his name, and he is the father of Cú Chulainn.
son of the sea
Sea god and ruler of the Otherworld: Emain Ablach, the isle of apple trees, and Mag Mell, the plain of delights. He hides the homes of the gods behind a mist of invisibility and owns a boat that steers itself, a horse that runs over water, and a sword called Fragarach.
Nuadha Airgeadlámh · Nuada of the silver arm
He loses his arm in battle, and with it the kingship. The healer Dian Cécht makes him an arm of silver and he takes the throne back.
Aonghus Óg · the young son
Son of the Dagda and Boann, and the god at the centre of five Irish myths.
Bóinn
The goddess of the Boyne, the river that runs past Newgrange. With the Dagda, her lover, she is the mother of Aengus.
Éire
The goddess the island is named for. Her name is the Old Irish word for Ireland, and it is where Éire comes from, and the Ire- in Ireland.
Emain Macha, Navan Fort, and Ard Mhacha, Armagh, are both named after her. In the best-known story, a pregnant Macha is forced to race the king's horses, and curses the men of Ulster with weakness in their hour of need.
Badhbh · crow
A war goddess in the shape of a crow, who spreads fear and confusion to turn a battle, and whose wailing before a battle foretells the dead. One of the three Morrígna.
Dian Céacht
The healer of the Tuatha Dé Danann, who made Nuada's silver arm. When his son Miach did better and grew the arm flesh, Dian Cécht killed him.
Airmheadh
Dian Cécht's daughter. Over the grave of her murdered brother Miach grew 365 healing herbs, one for each of his joints and veins. She gathered and sorted them on her cloak, and her father came up behind her and scattered them.
Gaibhne
The smith of the Tuatha Dé Danann, one of the three gods of craft.
Oghma
Credited in the medieval Ogam Tract with inventing ogham, the first script Irish was written in.
Ogham, and how to write your name in it → · Source: Wikipedia ↗
A midsummer goddess tied to County Limerick, where Knockainey, Cnoc Áine, is named for her. Rites in her honour on the hill, with fire and the blessing of the land, were recorded as recently as 1879.
the dark one
An ancestor of the Gaels, believed to be the god of the dead. The souls of the dead gather at his house, Teach Duinn. Folklore about him lasted into modern times, as a phantom horseman on a white horse.
A god whose worship, Christian writers say, involved human sacrifice and was ended by St Patrick. His image is described as gold, surrounded by twelve figures of stone or bronze.
an Chailleach · the old woman, the hag
A divine hag who shapes the land and brings the weather. In Ireland she is best known as the Hag of Beara.
The goddess the Tuatha Dé Danann, 'the folk of the goddess Danu', are usually said to be named for.
The Tuatha Dé Danann. The best known are the Dagda, the chief god; the Morrígan, the war goddess; Brigid, goddess of poetry, healing and smithing; Lugh, master of every art; Manannán mac Lir, god of the sea; Nuada of the silver arm; Aengus Óg, god of love; and Ériu, who gave Ireland her name.
The Morrígan, the great or phantom queen, who appears as a crow over battlefields. She is often one of three sisters, the Morrígna, with Badb and Macha. Nemain, the frenzy of battle, is linked with them, and Neit is the male war god.
Donn, the dark one, an ancestor of the Gaels believed to be god of the dead; the souls of the dead gather at his house, Teach Duinn. The Morrígan and Badb foretell death but do not rule the dead.
The Dagda, the good god: a father-figure, king and druid of the Tuatha Dé Danann, with a cauldron that never empties and a staff that kills with one end and revives with the other.
Probably, but almost nothing is known about her. Danu appears in no primary text; she is inferred from the name Tuatha Dé Danann. The mother goddess of fertility and plenty described online was attributed to her by Victorian folklorists.
Only through Christian monks, who wrote the stories down from about the eighth century, long after anyone worshipped these gods. They recast the gods as an ancient people, the Tuatha Dé Danann, who were defeated and went into the mounds. Calling one a 'god of' something is modern scholarship reading those texts, often helped by matching Gaulish and British gods.
The Mythological Cycle: their stories · What the gods became: the creatures of folklore · Ogham, Ogma's alphabet · Imbolc and Lughnasa