- C'era una volta, ora non c'è più
- C. C. Blake's Sweaty Space Operas, Issue 10
- C. C. Blake's Sweaty Space Operas, Issue 11
- C. C. Blake's Sweaty Space Operas, Issue 9
- C. C. Brower Short Story Collection 02
- C.A.T.S.
- Caccia all'uomo
- Cacesthesia
- Caelestis Series: Books 1-3 Plus Aelwyd
- Caesar Dies
- Caged Dreams: A Cyberpunk Science Fiction Short Story
- Calamcity
- Call Me Joe: Volume 1 of the Short Fiction of Poul Anderson
- Call Me Ogi
- Call Me Rhys
- Callisto Megabundle: The Complete Series (Science Fiction Romance)
- Calvin Blake NeuroCorp
- Cambiamenti
- Camera Obscura: A Doctor Who short story
- Can Hunt
- Canaanabis Roach
- Cancer Stick Addiction
- Cannabis Alienus 'alien dope'
- Canticle for Calyute
- Cape Town Curios
- Capolinea Città Eterna
- Captain Cee's Last Stand
- Captain Kuro From Mars Against The Polluters Comic Strip Book
- Captain Virtue and The League of Evil
- Captain's Log
- Captured By The Viking (Rough Reluctant Viking G******g)
- Carbide Tipped Pens
- Carbon Heart Silicon Soul: Books 1 - 3 (Jupiter, Juno, and Juventas)
- Carbon Heart Silicon Soul: Books 4 - 5
- Cargo Wars
- Carl Rogers Is Missing (Side Quest, #4)
- Carne gialla
- Carne o ferro
- Carolyn's Circus
- Carousel
- Carrera a Través del Espacio II: La Ola de Tiempo
- Case and the Dreamer
- Case Study (Five Fingers)
- Cases Of First Contact
- Casey Travels West
- Casey's Sunset Lover
- Casserole Diplomacy and Other Stories
- Casserole Diplomacy and Other Stories
- Castle of Days
- Castle of Terror
- Cat
- Cat Chronicles by Bastet Short Story Collection
- Cat Fight
- Cat Ladies Of The Apocalypse
- Cat Tales
- Cat's Breakfast: Kurt Vonnegut Tribute
- Catati TY Bundle: a collection of 5 short stories
- Catatone
- Catch
- Catch A Tiger
- Catch of the Day
- Catching Lightning
- Catgut Anthology
- Cats in Space and Other Places
- Cattedrali
- Cattitude
- Cattive notizie dal Vaticano
- Causality
- Cautionary Tales
- Cavanaugh's Cure
- Cave of Sorrows
- Caves of Ice: Part 1
- Cavie "Cellule dormienti"
- Ceasefire
- Ceaseless West: Weird Western Stories from Beneath Ceaseless Skies Online Magazine
- Cegados Parte II
- Cegados Parte III
- Celebrity
- Celebrity Space
- Celestial Automation
- Cell Division
- Cellmates
- Cementerio de Naves Espaciales
- Cenere
- Ceneri
- Center of the Dark
- Centro Ristrutturazione Temporale
- Cerberus
- Cercando un Altrove
- Certain Private Conversations... And Other Stories
- Cervelli Prestati
- CFPI's Marvin Stanton's War
- Chainsaw Raptor vs. Rocket Launcher Rhino
- Challenge Accepted
- Chameleons
- Change by Design
- ChannelCon '30
- Chansons de la cour de Beinan
- Chaos and Cosmos Sampler, Part 1
- Chaos and Cosmos Sampler, Part II
- Charity Case
- Chase The Gumtree Dog
- Chase's Play Date
- Chase: A Tomorrow Technologies Novella
- Chasing 'Oumuamua
- Chasing a Lead
- Chasing Magic
- Chasing Merlion
- Checkmate
- Checkpoint Lambda
- Chema, el Catracho Migrante
- Chemical City
- Chemical Creatures
- Chess
- Chevaliers errants
- Chew-9
- Chiamatemi Titano
- Chic to Freak
- Chicken Feet
- Child of Spring
- Child of Words Issue 1
- Child of Words Issue 2
- Child of Words Issue 3
- Children of a Different Sky
- Children of the Artificial Womb: A Cyberpunk Story
- Children of the Chronotron
- Children of the Chronotron & the Ultimate Death
- Children of the New World
- Children of the Stone Gods
- Children of the Uprising Collection Books 1–3
- Children of Tomorrow
- Chill Out (A Digital Short)
- Chimerascope
- Chipped
- Chiton
- Choice
- Choose Your Doom
- Chosen Ones / Source
- Christmas on Outcast Station