List of legendary creatures (F)
- Fachen – Monster with half a body
- Fafnir – Dwarf who was cursed and turned into a dragon. He was later slain by Sigurd in the Saga of Nibelung.
- Fairy – Nature spirits
- Falak – Giant serpent
- Familiar – Animal servant
- Far darrig – Little people that constantly play pranks
- Farfadet – Small, wrinkled, and brown-skinned helpful sprites.
- The Fates – Three time-controlling sisters
- Faun – Human-goat hybrid nature spirit
- Fear gorta – Hunger ghost
- Fearsome critters
- Feathered Serpent – Mesoamerican dragon
- Fei Lian – Chinese wind god
- Fenghuang – Chinese Phoenix, female in marriage symbol
- Fenodyree – House spirit
- Fenrir – Gigantic, ravenous wolf
- Fetch – Double or doppelgänger
- Fext – Undead
- Finfolk – Fish-human hybrid that kidnaps humans for servants
- Fir Bolg – Ancestral race
- Fire Bird – Regenerative solar bird
- Firedrake – Dragon
- Fish-man – Amphibious, scaled humanoid
- Flatwoods Monster – Alien, humanoid
- Flying Spaghetti Monster
- Fomorian – Goat-headed giant
- Forest Bull – Giant horned red cattle
- Four horsemen of the apocalypse
- Freybug – Norfolk black dog
- Fuath – Malevolent water spirit
- Fucanglong – Underworld dragon
- Funayūrei – Ghosts of people who drowned at sea
- Furu-utsubo – Animated jar
- Futakuchi-onna – Woman with a second mouth on the back of her head
- Fylgja – Animal familiar