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Leucetios: A Continental Celtic god of thunder.

Lia Fail: This is known as the Stone of Destiny, and was frequently mentioned in the medieval Irish romance. The belief is that when the feet of rightful kings rested on it the stone would roar for joy. In myth, the Tuatha Dé Danann first brought the stone to Ireland. According to tradition the stone became the famous Stone of Scone on which the Scottish kings were crowned at Scone, near Perth. It was removed by Edward I, in 1296, and taken to Westminster Abbey, in London, being placed under the chair of St. Edward. It was stolen by the Scottish Nationalists on Christmas Eve of 1950, but was recovered and returned in February, 1952. The stone is also known as the Tanist Stone or Jacob's Stone.

Llew Llaw Gyffes: Llew Llaw Gyffes, "the Bright Lion with the Sure Hand", son of the virgin Arianrhod. He could only be killed neither by day nor night, indoors nor out of doors, riding nor walking, clothed nor naked, nor by any weapon lawfully made. Because his mother had cursed him to have no human wife, he married a made woman, created of flowers, Blodeuwedd. She betrayed him with Goronwy, tricked the secret of his death out of him, and led him to it. Llew became an eagle, and was recovered into human form by his uncle Gwydion. He then killed Goronwy, but Blodeuwedd was turned into an owl.

Llyr: The Welsh sea god. Llyr (Lir Llyr) is the father of Bran, Branwen, and Manawydan. He is equal to the Irish god Lir. Lud: A mythical king of Britain. According to Geoffrey of Monmouth, the beautifier of London who was buried by the gate which bears his name. It is also suggested that the name is that of a Celtic river god.

Lugh (Lug): Lugh is the Celtic lord of every skill. He was patron of Lugodunum (Lyons) in Gaul. He and his nature goddess consort (Rosmerta) were worshipped during the 30 day Lugnasad midsummer feast in Ireland. Fertility magic during this festival ensured ripening of the crops and good harvest. He was called Lamfhada or 'of the long arm' in Gaelic because of his great spear and sling. His animal attributes were the raven and the lynx. Lugh mirrors Hindu Karttikeya, the spiritual warrior, and Roman Mercury, the swift messenger. His exploits are recounted in the Celtic epic Tuatha Dé Danann.

Luxovius: The Gaulish god of the waters of Luxeuil. Consort of Bricta.