- Jethabel
- Jeu d'échecs sur Mars (Cycle de Mars n° 5)
- Jeu de Rang
- Jewel of The Stars - Season 1 Episode 2 - A New Reality
- Jewel of The Stars. Season 1 Episode 1: The Remnant
- Jewels
- Jewels #2: Emerald Rebellion
- Jewels of Gwahlur
- Jewels of the Dragon
- Jexx
- Jeźdźcy Apokali - Atena
- Jie's World
- Jigsaw
- Jill and the Genestalk
- Jim & Jill
- Jim and the Flims
- Jim Newman’s Yarn: Or, A Sight of the Sea Serpent (Cryptofiction Classics - Weird Tales of Strange...
- Jimsy and the Monsters
- Jin-Bennu
- Jingle Tales
- Job, Herself
- Joe Devlin E il Nuovo Star Fighter
- Joe Devlin y el nuevo Guerrero Estelar
- Joe Ledger: Special Ops
- Joe Mauser, Mercenary from Tomorrow
- Joe's Milky Way Cafe
- Jogador número dois
- Jogador número um
- Jogos Zumbi Livro 1
- Johannes Cabal: The Fear Institute
- John Carter and the Giant of Mars
- John Carter of Mars
- John Carter on Barsoom
- John Carter on Mars
- John Carter’s Chronicles of Mars
- John Cold and the Weather Machine
- John in Roswell
- John J. Clifton, Temporal Specialist
- John Kosichev
- John's Eyes
- Johnny Baby
- Johnny Spacehair and the Oil of Ages
- Johnny Winger and the Amazon Vector
- Johnny Winger and the Battle at Caloris Basin
- Johnny Winger and the Europa Quandary
- Johnny Winger and the Golden Horde
- Johnny Winger and the Great Rift Zone
- Johnny Winger and the Hellas Enigma
- Johnny Winger and the Serengeti Factor
- Johnny Zed
- Johnny's Jaunt
- Joining the Storm
- Jolimont Street Ghost
- Jon's Story
- Jonctions
- Jones and the Big Jump
- Jorah's Revenge
- Jordan's World
- Josh Anvil and the Gathering Storm
- Josh Anvil and the Indomitable Power
- Joshua
- Joshua: Breaking Free
- Jota; melodía homicida
- Jour de Pâques chez les Dragonnets
- Journal
- Journals of Victoria
- Journey for the Souls
- Journey Home
- Journey for the Souls
- Journey Home
- Journey to Alfahsfere
- Journey to CotoPaxy
- Journey to Elvander
- Journey To Mars, A Space Odyssey
- Journey to New Earth
- Journey to Pirate's Cove
- Journey to the Center of the Earth "The Shasta Mountain Special Forces"
- Journey to the Center of the Earth (Illustrated Collectors Edition)
- Journey to the Center of the Earth 3
- Journey to the Center of the Earth 6
- Journey to the Centre of the Earth
- Journey to the Stars
- Journey to Yandol, and other stories
- Journey's End : An Asian Alternate-History Science Fiction Saga
- Journeys to the Lighter Side
- Journeys to the Planet Mars or Our Mission to Ento
- Jouth Anthology vol 1
- Jouth # 3
- Jouth # 4
- Jouth #1
- Jouth Anthology: the Fantastic Flying Saucer Stories
- Jovah's Angel
- Jove
- Jovian Veil: Sentient
- Joy to the Worlds: Mysterious Speculative Fiction for the Holidays
- Juan in a Million
- Jubilee
- Judas Unchained
- Judd's Errand
- Judged
- Judgement Dave