Billy Blind, Billy Blin, Billy Blynde, Billie Blin, or Belly Blin is an English and Lowland Scottish household spirit, much like a brownie. He appears only in ballads where he frequently advises the characters. It is probable that the character of Billy Blind is a folk memory of the god Woden or Odin from Germanic mythology, in his "more playful aspect"  and he seems to have been the same character as Blind Harie, the "blind man of the game" in Scotland.
In Child Ballad no 6, Willie's Lady, Willie's wife has been in labour and can not deliver because Willie's mother, a rank witch, is preventing her. Billy Blind advises Willie to make a wax figure of a baby and invite his mother to the christening. In her rage, the mother demands to know how all her magic was undone, listing all the things she's done, and Willie is able to undo them.
- Katharine Briggs, An Encyclopedia of Fairies, Hobgoblins, Brownies, Bogies, and Other Supernatural Creatures, "Billy Blind", p 23. ISBN 0-394-73467-X
- "The Review of English studies, Volumes 7-8", Clarendon Press, 1956.
- "Mythical bards and The life of William Wallace", William Henry Schofield, Harvard University Press, 1920
- "Scottish fairy belief: a history",Lizanne Henderson, Edward J. Cowan, Dundurn Press Ltd., 2001, ISBN 1-86232-190-6, ISBN 978-1-86232-190-8, p.49
- "The English and Scottish Popular Ballads", Francis James Child, Courier Dover Publications, 2003, ISBN 0-486-43145-2, ISBN 978-0-486-43145-1, p.67
- "In Search of Lost Gods: A Guide To British Folklore" Ralph Whitlock, Phaidon, 1979, p. 160
- "Living With Ballads" Willa Muir, Oxford University Press, 1965
- "The Critic, Volume 21" Carolyn Shipman, Charles Waddell Chesnutt, The Critic Printing and Pub. Co., 1894, page 435
- "The American-Scandinavian review, Volume 8" Henry Goddard Leach, American-Scandinavian Foundation., 1920
- "Games and songs of American children, collected and compared" W.W. Newell, 1883
- Francis James Child, English and Scottish Popular Ballads, "Gil Brenton"
- Francis James Child, English and Scottish Popular Ballads, "Willie's Lady"
- Francis James Child, English and Scottish Popular Ballads, "Young Beichan"
- Francis James Child, English and Scottish Popular Ballads, "The Knight and the Shepherd’s Daughter"
- Young Bekie (third version)