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Rhiannon: Rhiannon (her name is either "Maid of Annwn" or a variant of Rigatona, "Great Queen"), a version of the horse-goddess Epona and of sovereignity. She was mistress of the Singing Birds. She appeared to Pwyll, lord of Dyfed, as a beautiful woman in dazzling gold on a white horse. Pwyll sent his fastest horsmen after her, but could not catch her. On the third day, he spoke and she told him she wanted to marry instead of her espoused husband Gwawl. Pywll was to meet her in a year and a day. He won her at the court of her father, Hefeydd the Old, by her aid. She bore Pwyll a son, who vanished. Her women killed a puppy and smeared its blood on her, to avoid blame at the child's loss. As punishment, Rhiannon spent seven years telling her story to all comers and bearing them, like a horse, to the court. The child, meanwhile, turned up at the court of Teyrnon, whose mares foaled on May eve and lost the foals mysteriously. When Teirnon kept watch, he saved a foal from a mysterious beast and also discovered, outside the stable, a child, whom he and his wife adopted. Then child grew to young manhood in seven years, and was given the foal rescued on the night he was found. Teirnon recognised the child as the son of Pwyll and returned him to his family, where he was named Pryderi ("worry") by his mother. Later, after Pwyll's death, Rhiannon married Manawydan, brother of Bran and Branwen and son of Llyr, a great magician. One day, all of Dyfed turned into a wasteland, and only Rhiannon, Manawydan, Pryderi, and his wife Cigfa, were spared. Manawydan and Pryderi out hunting followed an enormous white boar into a caer, where Pryderi saw a golden bowl; when he touched it, he was enspelled. Rhiannon went after him and fell under the same spell the caer then vanished, taking them with it. She was rescued when Manawydan captured the wife of their enemy, Llwyd, who was taking revenge for the illtreatment of Gwawl. Robur: The Gaulish god of oak trees.

Rosmerta: In Gaulish Celtic mythology, Rosmerta was the goddess of fire, warmth, and abundance. A flower queen and hater of marriage, Rosmerta was also the queen of death. A Celtic goddess of fertility and wealth, whose cult was widely spread in Northeast Gaul. Rosmerta was the wife of Esus, the Gaulish Hermes. Her attributes are a cornucopia and a stick with two snakes.

Rudianos: A Gallic local god.

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Sabrina: The Celtic river goddess of the river Severn (southwestern Great Britain).

Saone (Souconna): A Celtic iver deity.

Segomo: The Gaulish (Continental Celtic) god of war and victory.

Sequanna (Sequana): The Celtic goddess of the river Seine.

Shannon (Siannon): The Irish goddess of the river Shannon. The myth of Sinend and the Well of Knowledge accounts for the name of the Shannon river. Sheila-na-gig: The goddess of fertility in British-Celtic mythology. She is prominently displaying her genitals in an attempt to allay the power of death. With the advent of Christianity she is portrayed (even on the outside of English churches) as a female demon to ward off evil.

Shoney: A Celtic sea deity recognized in Britain.

Sirona (Dirona): The Gaulish goddess of astronomy, and goddess of the Mosel Valley.

Smertios: The Celtic war-god who was especially worshipped by the Gaulish Treveri peoples. He is portrayed as a bearded athlete who, with a club, is about to kill a snake.

Sucellos: A Continental Celtic syncretic god whose aspects are not exactly clear. One of his frequently appearing attributes is the hammer, which earned him the title of 'hammer-god' and which reminds of a god of the dead. Often he holds a cup and a purse in his hand, which denotes a fertility god. One of his consorts is Nantosuetta. Sucellos is occasionally confused with the popular vegetation god Silvanus.

Sul (Sulla): The Celtic British goddess of hot springs, especially at Bath (Aquae Sulis).