"The White Sybil" is a short story by Clark Ashton Smith that takes place in the fictional prehistoric setting of Hyperborea. The tale was first published alongside David H. Keller's "Men of Avalon" by Fantasy Publications in 1934. "He knew that he had seen the White Sybil, that mysterious being who was rumored to come and go as if by some preterhuman agency in the cities of Hyperborea."