- Source: List of legendary creatures (U)
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- List of legendary creatures (U)
- Lists of legendary creatures
- List of legendary creatures (A)
- List of legendary creatures from Japan
- List of legendary creatures (Y)
- List of legendary creatures (M)
- List of legendary creatures (G)
- List of legendary creatures (P)
- List of legendary creatures (D)
- List of legendary creatures (B)
Ubume (Japanese) – Ghosts of women who died in childbirth
Uchek Langmeidong (Meitei mythology) – Semi human, semi hornbill creature
Ukko (Finnish) – Finnish sky deity
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) – Dragon
Unicorn (Medieval Bestiaries) – Horse-like creature with the legs of an antelope, the tail of a lion and a single magical healing horn.
Unktehi (Lakota) – Serpentine rain spirit
Unktehila (Lakota) – Reptilian water monster
Upinis (Lithuanian) – River spirit
Ur (Mandaean) – King of the World of Darkness, often portrayed as a dragon or snake
Urayuli (Native American) – Hairy giant
Uriaș (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