List of legendary creatures (Y)
- Yacumama – Sea monster
- Yacuruna – Mythical water people, with backwards heads and feet
- Yadōkai – Malevolent, nocturnal spirit
- Yagyō-san – Demon who rides through the night on a headless horse
- Yaksha – Male nature spirit
- Yakshi – Vampire
- Yakshini – Female nature spirit
- Yakubyō-gami – Disease and misfortune spirit
- Yale – Antelope- or goat-like animal with swiveling horns
- Yali – Lion like creature often symbolic for protecting temples
- Yallery-Brown – Nature spirit
- Yama – Wrathful god
- Yama-biko – Echo spirit
- Yama-bito – Savage, mountain-dwelling humanoid
- Yama-chichi – Monkey-like mountain spirit
- Yama-inu – Dog-like mountain spirit
- Yama-otoko – Mountain giant
- Yamata no Orochi – Gigantic, eight-headed serpent
- Yama-uba – Malevolent, mountain-dwelling hag
- Yama-waro – Hairy, one-eyed spirit
- Yanari – Spirit which causes strange noises
- Yaoguai – Animalistic demon or fallen gods
- Yara-ma-yha-who – Diminutive, sucker-fingered vampire
- Yatagarasu – Three-legged crow of Amaterasu
- Yato-no-kami – Serpent spirits
- Yeth hound – Headless dog
- Yeti – Mountain bigfoot
- Yilbegän – Either a dragon or a giant
- Yobuko – Mountain dwelling spirit
- Yōkai – Supernatural monster
- Yomotsu-shikome – Underworld hag
- Yong – Korean dragon
- Yōsei – Fairy
- Yosuzume – Mysterious bird that sings at night, sometimes indicating that the okuri-inu is near
- You Hun Ye Gui – Wandering ghost
- Yowie – Nocturnal human-ape hybrid, also Yahoo
- Ypotryll – Boar-camel-ox-serpent hybrid
- Yuan Gui – Distressed ghost
- Yukinko – Childlike snow spirit
- Yuki-onna – Female snow spirit
- Yūrei – Ghost
- Yuxa – 100-year-old snake that transforms into a beautiful human