C
- Cacodemon (Doom video game series)
- Cadaver (Darren Shan, The Demonata)
- Cagnazzo (Dante's Inferno)
- Calcabrina (Dante's Inferno)
- Calcifer (Diana Wynne Jones, Howl's Moving Castle)
- Candyman (Candyman movie)
- Cameron Briel (Lauren Kate Fallen series)
- Catherine (Catherine)
- Castor (Jonathan Stroud, Bartimaeus Trilogy)
- Catch (Christopher Moore, Practical Demonkeeping and Lamb)
- Chaos, the King of the Old Ones (The Power of Five), Anthony Horowitz
- Cordelia Chase (Angel TV series)
- Chernabog (Disney, Fantasia movie)
- Cherry (Sanrio character); see Berry & Cherry
- Chthon (Quake game)
- Chzo (Chzo Mythos adventure game series)
- Ciel Phantomhive (Kuroshitsuji)
- Cthulhu, Lord of Ry'leh, from H.P. Lovecraft's Cthulhu Mythos.
- The Car Christine (Christine)
- Ciriatto (Dante's Inferno)
- Claude Faustus (Kuroshitsuji)
- Costa Burra, the Death Coach (Strange)
- Clown / Violator (Spawn comic book series)
- Cole Turner (Charmed TV series)
- Crawly, a.k.a. Anthony J. Crowley (Neil Gaiman and Terry Pratchett, Good Omens)
- The Creeper (Jeepers Creepers)
- The Crone (Charmed TV series)
- Crowley (Supernatural TV series)
- Cyberdemon (Doom video game series)
- Cryto (Charmed TV series)
Read more about this topic: List Of Fictional Demons