X
Xana (Asturian) - Female water spirit
Xelhua (Aztec) - Giant
Xing Tian (Chinese) - Headless giant
Xiuhcoatl (Aztec) - Drought spirit
W
Yacumama (South America) - Sea monster
Yadokai (Japanese) - Malevolent, nocturnal spirit
Yagyo-san (Japanese) - Demon who rides through the night on a headless horse
Yaksha (Buddhist, Hindu, and Jainism) - Male nature spirit
Yakshi (Keralite) - Vampire
Yakshini (Buddhist, Hindu, and Jainism) - Female nature spirit
Yakubyo-gami (Japanese) - Disease and misfortune spirit
Yale (Medieval Bestiaries) - Antelope- or goat-like animal with swiveling horns
Yallery-Brown (English) - Nature spirit
Yamaarashi (Japanese) - Porcupine spirit
Yama-biko (Japanese) - Echo spirit
Yama-bito (Japanese) - Savage, mountain-dwelling humanoid
Yama-chichi (Japanese) - Monkey-like mountain spirit
Yama-inu (Japanese) - Dog-like mountain spirit
Yama-oroshi (Japanese) - a Radish-grater spirit
Yama-otoko (Japanese) - Mountain giant
Yamata no Orochi (Japanese) - Gigantic, eight-headed serpent
Yama-uba (Japanese) - Malevolent, mountain-dwelling hag
Yama-waro (Japanese) - Hairy, one-eyed spirit
Yanari (Japanese) - Spirit which causes strange noises
Yaoguai (Japanese) - Animalistic demon
Yara-ma-yha-who (Australian Aboriginal) - Diminutive, sucker-fingered vampire
Yatagarasu (Japanese) - Three-legged crow of Amaterasu
Yato-no-kami (Japanese) - Serpent spirits
Yeth hound (English) - Headless dog
Yilbegän (Turkic) - Either a dragon or a giant
Yobuko (Japanese) - Mountain dwelling spirit
Yofune-nushi (Japanese) - Sea monster
Yokai (Japanese) - Demon
Yomotsu-shikome (Japanese) - Underworld hag
Yong - Korean dragon
Yosei (Japanese) - Nature spirit
Yosuzume (Japanese) - Mysterious bird that sings at night, sometimes indicating
that the okuri-inu is near
Yowie (Australian Aboriginal) - Nocturnal human-ape hybrid, also Yahoo
Ypotryll (Heraldic) - Boar-camel-ox-serpent hybrid
Yukinko (Japanese) - Child-like snow-spirit
Yuki-onna (Japanese) - Snow spirit
Yurei (Japanese) - Ghost
Yuxa (Tatar) - 100 year-old snake that transforms into a beautiful human
Z
Zahhak (Persian) - Dragon
Žaltys (Baltic) - Serpentine fertility spirit
Zamzummim (Jewish) - Giant
Zâna (Romanian) - Nature spirit
Zashiki-warashi (Japanese) - House spirit
Zduhac (Slavic mythology) - Disembodied, heroic spirit
Zennyo Ryuo (Japanese) - Rain-making dragon
Zhar-Ptitsa (Slavic) - Glowing bird
Zhulong (Chinese) - Pig-headed dragon
Zhu Quč (Chinese) - Fire elemental bird
Žiburinis (Lithuanian) - Forest spirit in the form of a glowing skeleton
Zilant (Tatar) - Flying reptile with chicken legs
Zin (West Africa) - Water spirits
Ziz (Jewish) - Giant Bird
Zlatorog (Slovenia) - White deer with golden horns
Zmeu (Romanian folklore) - Giant with a habit of kidnapping young girls
Zmiy - Slavic dragon
Zombie (Vodou) - Re-animated corpse
Zorigami (Japanese) - Animated clock
Zuijin (Japanese) - Tutelary spirit
Zunbera-bo (Japanese) - Faceless ghost