Jack-In-Irons (English) - Malevolent giant
Jaculus (Medieval Bestiaries) - Winged serpent or small dragon
Jakotsu-babaa (Japanese) - Old woman who guards a snake mound
Jann (Arabian) - Oasis genie
Jasconius (Medieval folklore) - Island-sized fish
Jasy Jaterei (Guaraní) - Nature guardian and bogeyman
Jatai (Japanese) - Obi which has transformed into a snake
Jaud (Slavic) - Vampirised premature baby
Jenglot (Malay) - Vampiric little people
Jengu (Sawa) - Water spirit
Jentil (Basque) - Megalith-building giant
Jenu (Mi'kmaq) - Anthropophagous giant
Jerff (Swedish) - Gluttonous dog-cat-fox hybrid
Jian (Chinese) - One-eyed, one-winged bird who requires a mate for survival
Jiang Shi (Chinese) - Life-draining, reanimated corpse
Jiaolong (Chinese) - Dragon
Jibakurei (Japanese) - Spirit that protects a specific place
Jievaras (Lithuanian) - House spirit
Jikininki (Japanese) - Corpse-eating ghost
Jiu tou niao (Chinese) - Nine-headed, demonic bird
Jogah (Iroquois) - Little people nature spirit
Jörmungandr (Norse) - Sea serpent
Jorogumo (Japanese) - Spider spirit
Jotai (Japanese) - Animated folding screen cloth
Jötunn (Norse) - Gigantic nature spirits
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