- Cocoons ~ A Feel-good Story for Children ~
- Codex Hyperboreanus
- Codex Rosmanicus: Twelve Tales of Enchantment ~Compiled by Jaren the Traveller
- Coed Demon Sluts: Omnibus
- Coffee Time Stories
- Coffee: 14 Caffeinated Tales of the Fantastic
- Coffin Road
- Coins of Chaos
- Cold Grey Stones
- Cold Nights (Amethyst #2.5)
- Cold Steel & Magic (Four Short Fantasy Adventures)
- Colección de Julio Verne
- Colección de Robert Louis Stevenson
- Coleção Dark Titan One-Shot
- Collana di Racconti e Favole Vele vol. 1
- Collana di Racconti e Favole Vele vol. 2
- Collect One-Two
- Collected Ghost Stories
- Collected Stories of Fantasy and Science Fiction
- Collected Works of Algernon Blackwood (Unabridged)
- Collected: Volume 1
- Collected: Volume 2
- Collected: Volume 5
- Collision
- Colorado State of Mind
- Colores
- Colori
- Colours
- Come acqua versata nell'acqua
- Come frammenti di stelle
- Come to Me
- Come tu mi vuoi
- Comet Fever
- Comme un courant d'air
- Commencement
- Common Bonds: A Speculative Aromantic Anthology
- Common or Garden Variety Heroes
- Companions of the Eye and Ear
- Competition Secrets
- Complacent Capybaras and Other Stories
- Complacent Capybaras and Other Stories
- Complete Allan Quatermain of H. Rider Haggard
- Complete Children's Adventure Fairy Tales of E. Nesbit
- Complete Children's Novels of Ingersoll Lockwood (Illustrated)
- Complete Fairy Tales of Joel Chandler Harris (Illustrated)
- Complete Fantasy Myth Fairy Tales of Padraic Colum (Illustrated)
- Complete Grimm Brother Fairy Tales
- Complete Humor Satire of Saki
- Complete Me
- Complete Mystery Humor of Israel Zangwill
- Complete Mystery Science of Cornelius Shea
- Complete Romance Fantasy Adventure of Marie Corelli
- Complete Romance Fantasy Science & Religion of George MacDonald
- Complete Science Fantasy of Floyd L. Wallace
- Complete Science Fantasy of James Causey
- Complete Science Fantasy of R. A. Lafferty
- Complete Science Fantasy of Raymond F. Jones
- Complete Science Fictions of John W. Campbell
- Complete Science Pulp Skylark of E. E. Doc Smith
- Complete Tarzan Adventures
- Complete Tom Swift Adventure Series of Victor Appleton
- Complete Wizard of Oz of L. Frank Baum
- Complete Works
- Completed Story
- Complications of the Flesh
- Compostela (Tesseracts Twenty)
- Con l'Ultimo Respiro
- Conan
- Conan - Short Stories Three
- Conan - Short Stories Two
- Conan of Cimmeria: Short Stories One
- Conan the Barbarian: The Complete Collection
- Conception
- Concoction V2: A Mini Anthology of Shorts
- Concoctions
- Concours 2013
- Condoms and Cabbages: A SHORT Horror Story
- Condutores de Almas
- Confessions: Summerwend and Vigilantes
- Conflict: A Study in Heroic Contrasts
- Congruent Spaces Magazine, Issue 10
- Conjuring Crime: A Collected Uncollected Anthology
- Conmergence: An Anthology of Speculative Fiction
- Conning the Princess
- Conquest
- Consigned to the Sea
- Consolation Songs
- Constellar
- Consultations of the Mind
- Consumption of the Hampires
- Contes au choix
- Contes d'Erana : mythes et légendes
- Contes de fils et d'eaux
- Contes des provinces de France
- Contes de l'homme-cauchemar - Tome 1
- Contes étranges
- Contos clássicos de vampiro
- Contos da Velha Terra
- Contos de Erana
- Contos de Erana: a Maldição do Guerreiro
- Contos de P.A.L.M. ( Parceria de Animagi, Lobisomens e Metamorfo)
- Contos do Brasil profundo
- Contos e fábulas do Brasil
- Contos Sombrios e Versos Sinuosos
- Control
- Convenções do Insólito
- Cool Deal
- Cores
- Corpi freddi
- Corrosione
- Corrupts Absolutely?
- Corvidae
- Cose che capitano
- Cose dell'altro mondo
- Cosmic Love : Science Fiction Romance Collection
- Cosmic Mates : Alien Menage Romance Collection
- Costume
- Couleurs