In Irish mythology, Fand was Queen of the Fairies, and wife of Manannan. Manannan left her and she was attacked by three Fomorians who wanted to control the Irish Sea. The hero Cuchulainn agreed to help defend her as long as she married him. She agreed reluctantly, but then fell in love with him when she met him, as did he with her.

Manannan knew their relationship was doomed because Cuchulainn was mortal and Fand was a fairy; Cuchulainn's presence would destroy the fairies. Manannan then erased both Fand's and Cuchulainn's memory of each other.

Fand was a minor sea goddess in Celtic mythology, probably originating from an ancient Manx deity. Along with her sister, Liban, she was a goddess of pleasure and health.