From Wikipedia - Reading time: 4 min
A representation of a Clurichaun in T. C. Croker's Fairy Legends and Traditions of the South of Ireland
Cabeiri (Greek ) – Smith and wine spirit
Cacus (Roman ) – Fire-breathing giant
Cadejo (Central America ) – Cow-sized dog-goat hybrid
Cailleach (Scottish ) – Divine creator and weather deity hag
Caipora (Tupi ) – Fox-human hybrid and nature spirit
Caladrius (Medieval Bestiary ) – White bird that can foretell if a sick person will recover or die
Calingi (Medieval Bestiary ) – Humanoid with an eight-year lifespan
Callitrix (Medieval Bestiary ) – Apes who always bear twins, one the mother loves, the other it hates
Calydonian Boar (Greek ) – Giant, chthonic boar
Calygreyhound (Heraldic ) – Wildcat-deer/antelope-eagle-ox-lion hybrid
Camahueto (Chilota ) – One-horned calf
Cambion (Medieval folklore ) – Offspring of a human and an incubus or succubus
Campe (Greek ) – Dragon-human-scorpion hybrid
Camulatz (Mayan ) – Bird that ate the heads of the first men
Candileja (Colombian ) – Spectral, fiery hag
Canaima (Guyanese ) – Were-jaguar
Canotila (Lakota ) – Little people and tree spirits
Caoineag (Scottish ) – Death spirit (a particular type of Banshee/Bean Sídhe)
Čhápa (Lakota ) – Beaver spirit
Chareng (Meitei mythology ) — Semi-hornbill, semi-human creature
Căpcăun (Romanian ) – Large, monstrous humanoid
Carbuncle (Latin America ) – Small creature with a jewel on its head
Catoblepas (Medieval Bestiary ) – Scaled buffalo-hog hybrid
Cat Sidhe (Scottish ) – Fairy cat
Ceasg (Scottish ) – Benevolent Scottish mermaids
Ceffyl Dŵr (Welsh ) – Malevolent water horse
Centaur (Greek ) – Human-horse hybrid
Centicore (Indian ) – Horse-Antelope-Lion-Bear hybrid
Cerastes (Greek ) – Extremely flexible, horned snake
Cerberus (Greek ) – Three-headed dog that guards the entrance to the underworld
Cercopes (Greek ) – Mischievous forest spirit
Cericopithicus (Medieval Bestiary ) – Apes who always bear twins, one the mother loves, the other it hates
Ceryneian Hind (Greek ) – Hind with golden antlers and bronze or brass hooves
Cetus
Chakora (Hindu ) – Lunar bird
Chalkydri (Apocryphal writings ) – Angelic birds
Chamrosh (Persian ) – Dog-bird hybrid
Chaneque (Aztec ) – Little people and nature spirits
Changeling (European ) – Humanoid child (fairy, elf, troll, etc.) substituted for a kidnapped human child
Charybdis (Greek ) – Sea monster in the form of a giant mouth
Chenoo (Mi'kmaq/Algonquian ) – Giant, human-eating ice monsters; former humans who either committed terrible crime(s) or were possessed by evil spirits, turning their hearts to ice
Chepi (Narragansett ) – Ancestral spirit that instructs tribe members
Cherufe (Mapuche ) – Volcano-dwelling monster
Cheval Mallet (French ) – Evil horse who runs away with travelers
Cheval Gauvin (French ) – Evil horse who drowns riders, similar to kelpie
Church grim (Germanic ) – Guardian spirit
Chibaiskweda (Abenaki ) – Ghost of an improperly buried person
Chichevache – Human-faced cow that feeds on good women
Chickcharney (Bahamian ) – Bird-mammal hybrid
Chimaera (Greek ) – Lion-goat-snake hybrid
Chindi (Navajo ) – Vengeful ghost that causes dust devils
Chinthe (Burmese ) – Temple-guarding feline, similar to Chinese Shi and Japanese Shisa
Chitauli (Zulu ) – Human-lizard hybrid
Chōchin'obake (Japanese ) – Animated paper lantern
Chol (Biblical mythology ) – Regenerative bird
Chollima (Korean ) – Supernaturally fast horse
Chonchon (Mapuche ) – Disembodied, flying head
Choorile (Guyanese ) – Ghost of a woman that died in childbirth
Chromandi (Medieval Bestiary ) – Hairy savage with dog teeth
Chrysaor (Greek ) – Giant son of the gorgon Medusa
Chrysomallus (Greek mythology ) – Golden winged ram
Chukwa (Hindu ) – Giant turtle that supports the world
Chullachaki
Chupacabra (Latin America ) – Cryptid beast named for its habit of sucking the blood of livestock
Churel (Hindu ) – Vampiric, female ghost
Ciguapa (Dominican Republic ) – Malevolent seductress
Cihuateteo (Aztec ) – Ghost of women that died in childbirth
Cikavac (Serbian ) – Bird that serves its owner
Cinnamon bird (Medieval Bestiaries ) – Giant bird that makes its nest out of cinnamon
Cipactli (Aztec ) – Sea monster, crocodile-fish hybrid
Cipitio (Salvadoran folklore)
Cirein cròin (Scottish ) – Sea serpent
Coblynau (Welsh ) – Little people and mine spirits
Cockatrice (Medieval Bestiaries ) – Chicken-lizard hybrid
Cofgod (English ) – Cove god
Colo Colo (Mapuche ) – Rat-bird hybrid that can shapeshift into a serpent
Corycian nymphs (Greek ) – Nymph of the Corycian Cave
Cretan Bull (Greek ) – Monstrous bull
Crinaeae (Greek ) – Fountain nymph
Criosphinx (Ancient Egypt ) – Ram-headed sphinx
Crocotta (Medieval Bestiaries ) – Monstrous dog-wolf
The Cu Bird (Mexican ) – El Pájaro Cu ; a bird
Cuco (Latin America ) – Bogeyman
Cucuy (Latin America ) – Malevolent spirit
Cuegle (Cantabrian ) – Monstrous, three-armed humanoid
Cuélebre (Asturian and Cantabrian ) – Dragon
Curupira (Tupi ) – Nature spirit
Cu Sith (Scottish ) – Gigantic fairy dog
Cŵn Annwn (Welsh ) – Underworld hunting dog
Cyclops (Greek ) – One-eyed giant
Cyhyraeth (Welsh ) – Death spirit
Cynocephalus (Medieval Bestiaries ) – Dog-headed humanoid