Bheara (Ireland/Scotland) [Also Cailleach Bheur {see Cailleach below} or Cally Berry] She controlled the weather. When a handsome young man was kind to her, she changed herself from an ugly old hag into a beautiful young woman and rewarded him with her favors. She is also considered to be the "White Lady" and the wife of Manannan the Sea God; you can see her in the sunlight sparkling on the water.
Cailleach An ancient goddess of the pre-Celtic peoples of Ireland. She controlled the seasons and the weather; she was the goddess of earth and sky, moon and sun.

Bebhionn An Irish underworld goddess and a patron of pleasure.

Borvo (Gaul) God of healing

Corra (Scotland) Goddess of prophecy.

Gwendydd (Wales) Also called Gandieda or Gwendolyn. She was Merlin's sister (or twin, or lover, or all of the above, depending on which sources you believe).

Oenghus (Angus) (Irish) He is the son of Daghdha and Boann. He is the god of fatal love (akin to Cupid). Angus' kisses turn into singing birds, and the music he plays draws all who hear it to his side.

Scáthach (Celtic) She was a female warrior known as "the shadowy one". She was famous as a teacher of warriors, and many Celtic heroes were initially trained by her.

War Gods:

Aeron (Wales) God of war.

Alator A war god worshipped in Britain.

Andraste (Britain) Andraste is a warrior goddess, the goddess of victory.

Belatucadros (Britain) God of war and of the destruction. His name means "fair shining one". The Romans equated him with their god Mars.

Cathubodva Gaulish war goddess.

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.

Fea A war goddess, wife of Nuada.

Medb (Irish) Queen of Connacht, her name means "she who intoxicates". A goddess of war. Where the Morrigan use magic in battle, Medb wields a weapon herself. The sight of Medb blinds enemies, and she runs faster than the fastest horse.

Morrigan (Morrígú) (Irish) High Queen and goddess of the Tuatha Dé Danann. She was a trinity; Macha, Badb, and Neman (Nemain or Nemhain), all three bloodthirsty and feared by the enemies of the Tuatha Dé Danann. As Macha she was goddess of war and fertility who could take the shape of a crow or a raven. As Badb (Nechtan) she was the water-god whose sacred well was a source of knowledge. As Neman she was the goddess of war and battle.
Nemetoma A British war goddess.
Nemon A Gaelic war goddess.

Rigosamos A war god worshipped in Britain.

Teutates (Gaul) He is the god of fertility, war, and wealth. His name means "the god of the tribe". Human sacrifices were made to him (usually they were drowned in giant cauldrons). He is credited with inventing all the crafts of mankind. He is the equivalent of the Roman god Mars.

Tuetatesa (Gaul) God of war.

Smith Gods:

Brighid (Brigit) (Gaelic) Brighid was the goddess of fertility, therapy, metalworking, and poetic inspiration. She is the wife of Bres. She is known as Caridwen (Cerridwen) in Wales. There are three sisters by the name of Brigit in Irish myth (daughters of In Dagda) who are the patron-goddesses of learning (poetry), healing and smithcraft. Bride Scotland's version of the Celtic Irish Brigid.
Brigandu Celtic France version of the Celtic Irish Brigid.
Brigantia Celtic Briton version of the Celtic Irish Brigid.

Belisama Goddess of light and fire, the forge and of crafts. She is the wife of the god Belenus.
Belenus (Belenos): Bel or Beli to the Welsh; Bile to the Irish. (Gaul) God of healing and light, and referred to as "The Shining One". He is in charge of the welfare of sheep and cattle. His wife is the goddess Belisama. They can be compared with Apollo and Minerva.

Boibhniu Celtic god of smiths.

Creidhne Creidhne was the god of metal working. One of the trio of craft-gods of the Tuatha De Danaan, as were Goibhniu and Luchta.

Goibhniu (Celtic) Goibhniu was the smith god. One of three craft-gods of the Tuatha De Danaan. The other two were Luchta and Creidhne.

Govannon (Wales) God of smiths and metalworkers. The weapons he makes are deadly in their aim, the armor unfailing in its protection. Those who drink from his sacred cup need no longer fear old age and infirmity.