Celtic Gods & Goddesses
Choosing a diety to worship or channel through is a personal choice of the individual. In Druid belief, creation did not spawn from one diety alone, but from the coupling of two, hence the belief in a "Father God" and a "Mother Goddess". Their coupling produced "Creation" or all life.  In Druidism and in its sister religion, Wicca, this is called the Triangle of Manifestation. The Celts saw divinity in everything, including within themselves, and had many gods and goddesses to represent the divine in Nature. The Celts even elevated many of their mythic heroes to 'god' status. Through meditation, alignment and divination, it is possible to become one with the god or goddess of your choice.

You will find several different Celtic dieties and heroes listed below that you may wish to worship. By no means is this the 'end all' list of dieties and you are encouraged to seek the personal diety or dieties of your choice. Some people will worship one particular diety while others will pray to several. Again this is a personal choice of the individual. Pray to whomever you feel most comfortable with.
Anu
from Encylopedia Mythica

An Irish/Celtic fertility goddess, venerated as the mother of the gods. The center of her cult was the fertile Munster in southeast Ireland. The two rounded hilltops near Killarny are called 'the two breasts of Anu'. Anu is occasionally confused with Danu.

Arianrhod
From "Celtic Myth & Magic" by Edain McCoy

Ariahrhod's name means "Silver Circle". Ariahrhod is a Welsh diety and is the Goddess of reincarnation, the Wheel of the Year, the full moon, fertility and a primal figure of femine power. Her Heavenly star/island Caer Arianrhod in the Corona Borealis is believed in Welsh traditions where dead souls go to await reincarnation. Arianrhod is often depicted as a weaver, which links her to lost creation myths and to magickal practices, sometimes called "weaving a spell".

Arianrhod mated freely with whomever she chose and not questioned until the magician Math claimed she had conceived two children she had not borne. By jumping a staff, she gave birth to Llew and Dylan. Dylan left immediately to go to the sea. Ariahrhod denied the remaining son, Llew, the right to a name or arms, as was a Welsh mother's right to bestow. She was later tricked into bestowing both. She married her brother Gwyddion and is the daughter of the great Welsh mother-Goddess Don.  Arianrhod is often evoked to help females find their feminine power, spirit contact, sex and fertility magick and past-life knowledge. She is often called to bless Handfasting rites.
The Mother Goddess:
Arianrhod
Belenos (aka Bel, Bile, Belanos, Belinas or Beli)
from Encylopedia Mythica

Belenus is the Welsh god of light, and referred to as 'The Shining One'. His cult spread from northern Italy to southern Gaul and Britain. Belenus is in charge of the welfare of sheep and cattle. His wife is the goddess Belisama. They can be compared with the continental Apollo and Minerva, but Belenus can also be identified with the Irish god Bile. His festival is Beltine ("Fire of Bel"), celebrated on May 1. On this day, purifying fires were lit and cattle driven between them before being allowed out onto the open pastures.
Brid (aka Bridget, Brigit, Bride and Brighid)
from Celtic Myth & Magick by Edain McCoy

Brid was the great mother Goddess of Ireland. At one time in history, most of Ireland was united in praise and worship of her. She probably was one and the same with Dana, the first great mother Goddess of Ireland. Brid represents the supernal mother, fertility and creative inspiration. She has also been worshipped as a warrior and protectress, a healer and guardian of children, a slayer of serpents, a sovereign, and a Goddess of fire and the sun. Other sources relate her to agriculture, animal husbandry, medicine, crafting and music. Brid is credited with inventing the Irish mourning wail called caoine (keening) when she mourned for her son, Ruadan, her child by her husband Bres, who was killed in battle. In the 5th Century, her shrine at Kildare was Christianized and adopted as a holy site. The legendary Brid has been combined with the Christian Saint Bridget. Brid is known as the Queen of Heaven. Her sabbat, Imbolc, is celebrated on February 2.
The Goddess of Fire ~ Brid
The God of Fertility   Cernunnos
Cernunnos (The Horned God)
from Encyclopedia of the Celts

The Lord of the Animals, 'Horned One', whose images are found in Romano-Celtic worship sites, and whose role as hunter and animal god is preserved in Celtic legend and folk lore. He ruled the active forces of life and death, giving and taking, in nature; in Romano-Celtic culture he was associated with wealth and prosperity, due to his role as Guardian of the Gateway to the Underworld where all potential forces and events originated. It should be stated emphatically that this deity has far to less to do with 'fertility' and sexuality than is assumed in popular fantasy, for he is a god of hunting, culling and taking.  His purpose is to purify through selection or sacrifice, in order that powers of growth and fertility may progress without stagnation. In this context of purification and de-pollution, he should be an especially interesting figure to us today, for he represents certain truthts known to our ancestors which have been neglected by us at our peril. The figure of Cernunnos from the Gundestrup Cauldron (second century AD) is probably the best-known representation of the Celtic Horned God (See plate next page).His very name is really the title, 'Horned One.' Holding a torc and a serpent, wearing an antlered cap, he sits in a yoga pose with his right heel against his genitals. Nearly all seated statues of Hindu deities show the same conventional pose. The torc and serpent are also genital symbols, female and male respectively.  Cernunnos is the spirit of the sacrificed stag-god, a nature deity to whom sacrifices were dedicated in order to maintain the wild creatures and the cycles of nature with his holy blood. There has been considerable speculation about Cernunnos' costume, which appears to be a form-fitting suit of ribbed knitted fabric, with knee-length pants. It is one of the pieces of evidence cited for the antiquity of the art of knitting among Celtic peoples.
The Dagda
from Encyclopedia Mythica

The Irish-Celtic god of the earth and treaties, and ruler over life and death. Dagda, or The Dagda, ("the good god") is one of the most prominent gods and the leader of the Tuatha Dé Danann. He is a master of magic, a fearsome warrior and a skilled artisan. Dagda is a son of the goddess Danu, and father of the goddess Brigid and the god Aengus mac Oc. The Morrigan is his wife, with whom he mates on New Years Day  The Dagda is portrayed as possessing both super- human strength and appetite. His attributes are a cauldron with an inexhaustible supply of food, a magical harp with which he summons the seasons, and an enormous club, with one end of which he could kill nine men, but with the other restore them to life. He also possessed two marvellous swine---one always roasting, the other always growing---and ever-laden fruit trees. One of his epithets is Ollathir, which means "All-father". He is identified with the Welsh Gwydion and the Gallic Sucellos.
The God of Horses   Epona
Epona
from Encyclopedia Mythica

The Celtic horse goddess whose authority extended even beyond death, accompanying the soul on its final journey. She was worshipped throughout entire Gaul, and as far as the Danube and Rome. Her cult was eventually adopted by the Roman army and they spread her worship wherever they went. She was the only Celtic Goddess to be honored by the Romans with a temple in their capital city. Among the Gaulish Celts themselves, she was worshipped as goddess of horses, asses, mules, oxen, and, to an extent, springs and rivers.Epona is depicted sitting side saddle or lying on a horse, or standing with multiple horses around her. Her symbol is the Cornucopia ("horn of plenty") which suggests that she could (originally) have been a fertility goddess. She is also identified with the Celtic goddess Edain.