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Nantosuetta: A Celtic goddess worshipped in Gaul. She forms a pair with the god Sucellos. Her attribute is as cornucopia ("horn of plenty"), which refers to her aspect of fertility goddess. Occasionally she is represented with a cottage on her hand, which could indicate that she was patroness of the family. Nantosuetta was also a goddess of the realm of the dead.

Nemausus: The Gaulish god associated with the Springs of Nimes. In later times he became the god of the city of Nimes.

Nemetona: The Celtic goddess of sacred groves or shrines (nemeton, "shrine").

Nisien and Efnisien: Nisien and Efnisien, sons of Penarddun by Eurosswydd, who had captured her husband Llyr and held him hostage until she slept with him. They were twins, and half-brothers by Penarddun of the royal Bran, his sister Branwen, and Manawydan. Efnisien mutilated the horses given by the Irish king Matholwch as a bride-price for Branwen, for Efnisien felt that such a marriage was a mortal insult. This act nearly precipitated warfare, but Matholwch was appeased by the gift of a cauldron that could resurrect the dead. Branwen wed him, and went to Ireland, where she bore him a son, Gwern. But she was then imprisoned, and the Welsh had to go and rescue her. Peace was achieved through the efforts of Manawydan. Some Irish lords objected, and hid themselves in flour bags to attack the Welsh. But Efnisien, scenting Irish treachery, cast them into the fire, and then cast Gwern himself in (avoiding the geas against shedding kinsmen's blood thereby). A war broke out, and the Irish replenished themselves through the cauldron. Efnisien, repenting, sacrificed himself by feigning death and being thrown into the cauldron, which he then broke, dying in the process.

Nodens (Nodons): The Celtic river god of the Severn estuary in south-west Britain. He can be equated with Nuada.

Nuada: Also Nudd or Ludd. "Silver Hand." The Irish/Celtic chieftain-god of healing, the Sun, childbirth, youth, beauty, ocean, dogs, poetry, writing, sorcery, magic, weapons, and warfare. Similar to the Roman god Neptune, Nuada also had an invincible sword, one of four great treasures of the Tuatha Dé Danann, that he used to cleave his enemies in half. Ruler of Ireland he was deemed useless and replaced by Bres after he lost his hand in battle. His brother Dian Cecht, the great god of healing, fashioned him a silver hand for a substitution. By this time Bres had become a tyrannical leader and was exiled by the Tuatha Dé while Nuada returned to his position as king. He was later killed by the god of death Balor