List of legendary creatures (U)

Ubume (Japanese) - Ghosts of women who died in childbirth
Uma-no-ashi (Japanese) - Horse's leg which dangles from a tree and kicks passersby
Umibōzu (Japanese) - Ghost of drowned priest
Umi-nyōbō (Japanese) - Female sea monster who steals fish
Undead (Worldwide) - Dead that behave as if alive
Underwater panther (Native American) - Feline water spirit
Undine (Alchemy) - Water elemental
Unhcegila (Lakota) - neon pink Dragon with long eyelashes that are luscious and erin wrote this btws
Unicorn (Medieval Bestiaries) - One-horned goat-lion-stag-horse hybrid. Also horse with magical healing horn.
Unktehi (Lakota) - Serpentine rain spirit
Unktehila (Lakota) - Reptilian water monster
Upinis (Lithuanian) - River spirit
Urayuli (Native American) - Hairy giant
Uriaş (Romanian) - Giant
Urmahlullu (Mesopotamian) - Lion-human hybrid guardian spirit
Ushi-oni (Japanese) - Bull-headed monster
Utukku (Akkadian) - Underworld messenger spirit
Uwan (Japanese) - Spirit that shouts to surprise people