- Captain Niall Thorvald
- Captain of the Kali
- Captain Quinn Bracken
- Captain Ranell Glent
- Captain Tanoh Ohnat
- Captain Virtue and The League of Evil
- Captain Vorpatril's Alliance (Vorkosigan Saga)
- Captain's Boy
- Captain's Call Book Four
- Captain's Call Book One
- Captain's Call Book Three
- Captain's Call Book Two
- Captain's Log
- Captain's Memories
- Captive - La Faille
- Captive and Consequences
- Captive Desire
- Captive Echo
- Captive Mail
- Captive Universe
- Captives in Obscurity
- Captives of the Flame
- Captives of the Song
- Captives of the Thieve-Star
- Captura
- Capture
- Capture: The Relissarium Wars Space Opera Series, Book 6
- Captured by the Cyborg - Alien Romance
- Captured by the Hawk
- Caradoc
- Caradrius
- Carakenne - A Journey to Nyorfias Novella
- Caranna Baro and the Legacy Mark
- Carbon Copy
- Carbon Heart Silicon Soul: Books 1 - 3 (Jupiter, Juno, and Juventas)
- Carbon Heart Silicon Soul: Books 4 - 5
- Carcassonne
- Card Sharp Silver: A Cave Creek Novel
- Cardinal Machines
- Cards of Grief
- Caretakers
- Cargo
- Cargo 069
- Cargo Wars
- Carl Sagan's Hunt for Intelligent Life in the Universe
- Carmilla
- Carnage (Remastered)
- Carnal Fusion
- Carnal Fusion
- Carnal Thirst
- Carnaval***
- Carnelians
- Carnifex
- Carnival
- Carnival Tricks
- Carnivores of Light and Darkness
- Carnivori
- Carosello senza suoni
- Carpe Diem
- Carpe Diem, Alter!
- Carpe Noctem
- Carpe Tempus
- Carpool to the Moon
- Carrera a Través del Espacio III - El Final de los Tiempos
- Carrick House
- Carrie's Calamity
- Carrier
- Carrion Crow
- Carson of Venus
- Carson of Venus SF Gateway Omnibus
- Cartago Triunfante
- Cartel Robotique : L'intégrale
- Cartwright's Cavaliers
- Carved Genes
- Casa Capitular (Las crónicas de Dune 6)
- Casa de Soles
- Cascade
- Cascade Effect
- Cascade Point
- Cascaders
- Case and the Dreamer
- Case of the Abominable
- Case of the Deadly Goddess
- Case: 0
- Case: 1
- Case: 2
- Casey Agonistes
- Cash Crash Jubilee
- CassaDark
- CassaDawn
- CassaFire
- Cassandra's Challenge
- CassaSeries
- CassaStar
- CassaStorm
- Cassie Pengear Mysteries books 1,2,3- Killing at the Carnival, Death at Dinner, Stabbing Set with Sa...
- Cassie's Troubles
- Cast a Bright Shadow
- Cast Adrift
- Cast in Sand
- Castaway Odyssey
- Castaway Resolution
- Castaways of Eros
- Casting Souls
- Castle of Teskom
- Castle Vroman
- Castoff World
- Cat And Company
- Cat Country
- Cat Fancy
- Cat Ladies Of The Apocalypse
- Cat Leaps
- Cat Refuge
- Cat Zero
- Cat's Claus
- Cat's Meow
- Cat's Whirld
- Cat-A-Lyst
- Cat-Girls Have Four Ears
- Cataclismo
- Cataclysm
- Cataclysm and Rebirth
- Catacomb Years
- Catacombs
- Catallaxis
- Catalyst (Star Wars)
- Catalyst Gate
- Catalytic Agents
- Catarsis
- Catastrophe Planet
- Catastrophic Attraction
- Catatan (Seorang) Alien Yang Terdampar di Indonesia
- Catati TY Bundle: a collection of 5 short stories
- Catch a Falling Constellation
- Catch a Falling Star
- Catch A Tiger
- Catching the Dark: An Alt History Short Story
- Caterpillars (Cryptofiction Classics - Weird Tales of Strange Creatures)
- Cathedral of the Sky
- Cats & Dogs and a Pig?
- Cats Out of the Bag
- Catseye