- Contaminación
- Contaminant Six
- Contamination
- Contamination (Zombies Are Human, Book One)
- Contes étranges
- Contest- A Dane Maddock Adventure
- Contested Crown
- Contiguity
- Contingência, ou tô pouco ligando
- Continuance
- Continuity Failure: Tales of Apocalypses and Aftermaths
- Continumental Stories: Volume 1
- Continuum
- Continuum (Riven Worlds Book One)
- Contos Distorcidos do Universo
- Contraataque
- Contract Expired
- Contract of Betrayal: Spectras Arise Trilogy, Book 2
- Contract of Defiance
- Contravene
- Control: Splintered Earth #1
- Controller
- Convergence
- Convergence - Journey to Nyorfias, Book 1
- Convergence Point: Where Worlds Meet
- Convergence, A The Earthside Trilogy Novel
- Converging Parallels
- Conversation Hearts
- Conversations avec l'au-delà
- Conviction
- Convocation: The Battle Unseen Part One
- Convolute Prine
- Convoy to Atlantis
- Conwy
- Cookie Smuggler
- Cookmancer Online: A LitRPG / GameLit Novel
- Coolhunting
- Cooper B.
- Cop (Star Minds Lone Wolves)
- Copernican Journey
- Copernicks Rebellion
- Coplete Terro-Human Future History Series of H. Beam Piper
- Copper Angels
- Coppermill
- Copy
- Copy Me Popular
- Copy, Write
- Coração Atómico
- Cords of the Ascendant
- Core Punch
- Core Reality Volume 1 Centennial Guard
- Core Runners
- Core Threat: Mission 11
- Core Values
- Coriolis, de stormplaneet
- Cornerstone
- Cornucopia
- Corona
- Coronation At The Mountain Of The Ancients
- Coronavirus 2054
- Coronavirus Mutation: Sci-Fi Apocalypse Short #5 Martial Law and the Road to Mayhem
- Coronavirus Mutation: Sci-Fi Romance Short
- Coronavirus Mutation: Sci-Fi Romance Short #2 About Second Chances Before the Apocalypse
- Coronavirus Mutation: Sci-Fi Romance Short #3 Stem Cells, Mitochondria, and Telomere Second Chances ...
- Coronavirus Mutation: Sci-Fi Thriller Short #4 H.R. 16666 Bill and the TRAIL Act with Second Chances...
- Coronavirus Mutation: Short #6 The Sinister Origin of Quantum Computer Warfare
- Corpi freddi
- Corpora
- Corporal Xasl
- Corporate Pain
- Corpse Run
- Corpuscular Sensing of Autumn
- Corre, João, corre
- Corrida pelo espaço II: a onda do tempo
- Corrida pelo espaço – Livro 1
- Corridor
- Corsa nello spazio
- Corsana: The Phalanx Syndicate
- Corsica's Revenge
- Cosm
- Cosmic Beginnings
- Cosmic Consciousness
- Cosmic Corsairs
- Cosmic Derelict
- Cosmic Enigma
- Cosmic Exodus
- Cosmic Kaleidoscope
- Cosmic Lock
- Cosmic Misfits
- Cosmic Rift I - Riftworld GT-4416 - The Unveiling
- Cosmic Seagulls: Exodus
- Cosmic Seasoning: A Collection of Short Stories
- Cosmic Tales 10: Upgrade
- Cosmic Tales 11: Star Child
- Cosmic Tales 12: Vagabond
- Cosmic Tales 13: Field Trip
- Cosmic Tales 1: Resurrection
- Cosmic Tales 2: Zulgahoik!
- Cosmic Tales 3: Missing In Action
- Cosmic Tales 4: The Unexpected Guest
- Cosmic Tales 5: Pipe Dreams
- Cosmic Tales 6: Tragedy
- Cosmic Tales 7: Virus
- Cosmic Tales 8: Ghost
- Cosmic Tales 9: Kingdom
- Cosmic Trilogy
- Cosmic Wars
- Cosmoflux
- Cosmofobia
- Cosmonaut Keep
- Cosmophobia
- Cosmos
- Cosmos Quest
- Cost of the Hunt
- Costigan's Needle
- Costume
- Cottonmouth
- Count Brass
- Count Geiger's Blues
- Count to a Trillion
- Count to Infinity
- Count Zero
- Countdown For Armagetten
- Countdown in Spidertown
- Counter Clockwise
- Counter Program
- Counter Spike
- Counter Strike
- Counterattack
- Counterfeit Stars: Agents of ISIS, Book 8
- Countermind
- Countersolar!