- Citadel of Fear
- Citadel of Lost Ships
- Citadel: Children of Light
- Citadel: First Colony
- Citadel: Omnibus
- Citadel: The Value of War
- Citizen X
- Citizen Zero
- City Come A-Walkin'
- City in the Fire
- City Of Deceit
- City of Delusions
- City of Dod
- City of Night
- City of Ruin: A Gothic Dystopian Beauty and the Beast Retelling
- City of Ruins: A Diving Novel
- City of Smoke and Iron - Season One
- City of the Living Dead
- City of the Lords
- City Out of Time
- City Strike
- City Under Ice
- City Under the Stars
- Citónica (Escuadrón 3)
- Ciudad Abismo
- Ciudad de zombis
- Ciudad motor
- Civil Righteousness
- Civilisation 0.0
- Civility
- Civilizations
- Civilly Disobedient
- Cizinec
- Claim of the Alien God
- Claimed
- Claimed (The Flash Gold Chronicles, #4)
- Claimed by an Alpha : Paranormal & Sci-fi Romance Collection
- Claimed by the Alien Shifter
- Claimed By The Cyborg Commander
- Claimed by the Cyborgs
- Claiming Charity
- Claiming Charity
- Claiming Her Alien Warrior
- Claiming Her Bears
- Claiming His Omega
- Claiming His Virgin
- Claire's Apocalypse
- CLAN
- Clans of Antarea Trilogy
- Clarence
- Claribel & Caliban
- Clarion: The Sequel to Voyage
- Clarissa
- Clarity's Dawn
- Clarkesworld Magazine Issue 101
- Clash of Flesh and Metal
- Class Reunion
- Class Zero
- Class-M Exile
- Class: Joyride
- Class: The Stone House
- Class: What She Does Next Will Astound You
- Classic Cyborg
- Classic Martian Stories, Vol. 1
- Classic Martian Stories, Vol. 2
- Classic Martian Stories, Vol. 3
- Classic Martian Stories, Vol. 4
- Classic Martian Stories, Vol. 5
- Classic Martian Stories, Vol. 6
- Classic Martian Stories: The Complete Series
- Classic Moon Stories, Vol. 1
- Classic Moon Stories, Vol. 2
- Classic Moon Stories, Vol. 3
- Classic Moon Stories: The Complete Series
- Classic Tales of Horror
- Classic Venus Stories, Vol. 1
- Classic Venus Stories, Vol. 2
- Classics Reimagined, The Time Machine
- Claws of Brass
- Claws of Death: An Agents of The Emperor Science Fiction Short Story
- Claws That Catch
- Clay (Episode One of Farther Than We Dreamed)
- Clean Install
- Cleaning Up The Future
- Cleanup Crew
- Clear as Light
- Clementine
- Cleon Moon
- Clidepp Deja Vu
- Clidepp Requital
- Cloak King Royal Blood: Chapter 1: The Call of Mant-Orr
- Cloak King Royal Blood: Chapter 2: Rejecting Mant-Orr's Promotion
- Cloak King Royal Blood: Chapter 3: The Power of the Manifest Stones
- Cloak King Royal Blood: Chapter 4: Moving Beyond Cycles
- Cloak King Royal Blood: Chapter 5: The Cave of Transparency
- Cloak King Royal Blood: Chapter 6: The Inner Caverns
- Cloak King Trilogy 1: Books 1, 2, & 3
- Cloak King: Intertwined
- Cloak King: Plucked Out of Time
- Cloak King: Royal Blood
- Cloak of Deception: Star Wars
- Cloaked Enemies
- Clocking Time
- Clockwork at the Big Top
- Clockwork Butterfly
- Clockwork Chaos
- Clockwork Depths
- Clockwork Deus
- Clockwork Fairies
- Clockwork Fairy Tales: A Collection of Steampunk Fables
- Clockwork Heart
- Clockwork Imperium Stories 1-3
- Clockwork Mafia
- Clockwork Nessie
- Clockwork Nutcracker
- Clockwork Octopus
- Clockwork Phantom
- Clockwork Planet: Volume 1
- Clockwork Planet: Volume 2
- Clockwork Planet: Volume 3
- Clockwork Planet: Volume 4