- C'era una volta, ora non c'è più
- C'est MA Terre
- C-Notes: A Collection of 100 Drabbles
- C-Vamp
- C. C. Blake's Sweaty Space Operas, Issue 1
- C. C. Blake's Sweaty Space Operas, Issue 2
- C. C. Blake's Sweaty Space Operas, Issue 3
- C. C. Blake's Sweaty Space Operas, Issue 4
- C. C. Blake's Sweaty Space Operas, Issue 5
- C. C. Blake's Sweaty Space Operas, Issue 6
- C. C. Blake's Sweaty Space Operas, Issue 7
- C. C. Blake's Sweaty Space Operas, Issue 8
- C. C. Brower Short Story Collection 01
- C.L. Moore SF Gateway Omnibus
- C.L.O.W.N. 242
- Caballero Alienígena: Problemas con el oso de felpa
- Caccia allo Snark
- Cache from Outer Space
- Cadavre exquis
- Cadenza II: Realm of Secrets
- Cadenza III: Order of Chaos
- Cadete del espacio
- Cadre
- Caelestis Series: Books 1-3 Plus Aelwyd
- Caesar Dies
- Caesar's Bicycle
- Café Street & Other Stories
- Café-pipes
- Caged by the Barbarian
- Caged Dreams: A Cyberpunk Science Fiction Short Story
- Caged Princess
- Caid: Dakonian Alien Mail Order Brides 3 (Intergalactic Dating Agency)
- Cain's Blood
- Cal y arena
- Calamity
- Calamity (Reckoners 3)
- Caldera Book 6: New World Order
- Caliban
- Caliban : Mind Division - Mission 1
- Caliban's War
- Caliban's World
- Califia's Daughters
- Califormication
- California
- California Time Traveler
- Caligo
- Call Center of Doom
- Call Me Joe
- Call Me Pharaoh
- Call Me Wizard
- Call of Courage
- Call of Destiny
- Call of Destiny (One Small Step out of the Garden of Eden,#1)
- Call of Fire
- Call of the Void
- Call the Bluff
- Call to Arms (Star Crusades Nexus, Book 6)
- Call to Battle
- Callahan's Key
- Calling Major Tom
- Calliope and the Engine Smith
- Calliope and the Khirshan Empire
- Calliope and the Royal Engineers
- Calliope and the Sea Serpent
- Callisto 2.0 A novel of the future
- Callisto Megabundle: The Complete Series (Science Fiction Romance)
- Cam Girl Hell
- Cambio de esquemas
- Camelot 30K
- Caminante sin recuerdos
- Campo de concentración
- Can You Believe Part 1
- Can You Make It?
- Can You Survive the Zombie Apocalypse?
- Can't Fall Back
- Can't Shoot Straight Gang
- Can't Shoot Straight Gang Returns
- Canal Dweller
- Cancer World
- Canciones perdidas / Los cuentos ocultos (Mapas en un espejo 5)
- Candy Savant
- Canis Borg: Alien Control Agent
- Canisse
- Canopus - Der Kalte Krieg 1
- Cantata-140
- Canticle
- Canticum Tenebris
- Canto Bight (Star Wars)
- Can’t Dream Without You
- Capella's Golden Eyes
- Capital Punishment
- CAPRICORN 01
- CAPRICORNIO 01
- Captain Dan Saves Beta Earth
- Captain Dex Corrigan
- Captain Disco: A New Disco
- Captain Future #10: Outlaws of the Moon
- Captain Future #12: The Comet Kings
- Captain Future #13: Planets in Peril
- Captain Future #15: Worlds to Come
- Captain Future #16: The Star of Dread
- Captain Future #17: Magic Moon
- Captain Future #18: Days of Creation
- Captain Future #1: The Space Emperor
- Captain Future #22: The Return of Captain Future
- Captain Future #25: Pardon My Iron Nerves
- Captain Future #26: Moon of the Unforgotten
- Captain Future #28: Birthplace of Creation
- Captain Future #2: Calling Captain Future
- Captain Future #3: Captain Future's Challenge
- Captain Future #6: Star Trail to Glory
- Captain Future #7: The Magician of Mars
- Captain Future #8: The Lost World of Time
- Captain Future #9: Quest Beyond the Stars
- Captain Future 4: Der Triumph
- Captain Future 5: Die sieben Weltraumsteine
- Captain Future 6: Sternenstraße zum Ruhm
- Captain Future 7: Der Marsmagier
- Captain Future and the Space Emperor
- Captain Future in Love
- Captain Future's Challenge
- Captain Future: 1,500 Light Years from Home
- Captain Future: The Guns of Pluto
- Captain Humphry und das Bildnis der Welt
- Captain Kirk's Guide to Women
- Captain Lewis' Broken Dreams