- Jenseits aller Galaxien: Science Fiction Sammelband
- Jenseits der Zeit
- Jeph's Daughter
- Jeremiah Willstone and the Clockwork Time Machine
- Jeremy Raybourne: The Genesis Dawns (Book Two: Journey To The New Awakening)
- Jericho
- Jericho Calling
- Jericho Falling
- Jerry Quarry Died for Our Sins
- Jerry Siegel's & Joe Shuster's Science Fiction
- Jessie Sparks
- Jesus Christ and the Broken Microwave Oven
- Jesus Christ Fundamentalist Christian Slayer
- Jet il Grigio
- Jetta of the Lowlands
- Jetta: The Calling Series (Book 2)
- Jeu d'échecs sur Mars (Cycle de Mars n° 5)
- Jeu de Rang
- Jeune
- Jewel
- Jewel of The Stars - Season 1 Episode 2 - A New Reality
- Jewel of The Stars. Season 1 Episode 1: The Remnant
- Jewels of Gwahlur
- Jexx
- Jezdci na vlnách světla
- Jezebel (Daughter of Darkness): Jezebel's Journey, Book 1
- Jhyoti: Planetside
- Jie's World
- Jill Titan and the City of Robots
- Jill Titan and the Ghost Fleet
- Jill Titan and the Secret Weapon
- Jillia's Man, Gone Astray
- Jillia's Man, Regained
- Jim & Jill
- Jim Héroe Galáctico
- Jimmy Stu Lives!
- Jimsy and the Monsters
- Jin-Bennu
- Jingo
- Jinian Footseer
- Jinian Star-Eye
- Jintao
- Jirel of Joiry
- Joan Darcy & The 27th Observer, The Telescope of Elsewhere
- Job Hunter
- Job, Herself
- Jocasta: Wife and Mother
- Joe & Bixby: Marked For Averageness
- Joe Calico in the Game: the Apprentice
- Joe Steele
- Joe Tripician: Obras Seleccionadas, Volumen 1
- Joha: A World Apart
- John 76359
- John Calleghan & The PSI Pirates
- John Carter - Der Riese und die Gelben vom Mars
- John Carter 1 : A Princes of Mars (Annotated)
- John Carter of Mars Series
- John Carter on Barsoom
- John Carter on Mars
- John Cold and the Weather Machine
- John Crusher P.I.: The Velvet Clad Hooker
- John Deer et l'origine des Sirènes
- John Gone
- John Kosichev
- John Mann: At Day's End
- John Sladek SF Gateway Omnibus
- John the Dreamer and the dagger of truth
- John's List
- Johnny Parafango
- Johnny Qwinn in the Attack of the Arachnids
- Johnny's Jaunt
- Johnny: Book 3 of the ROE Chronicles
- Joja
- Joker Moon
- Jokers Wild
- Jolie Blonde
- Jolly Roger
- Jolly Rogers: A Story About Boyhood
- Jonas Grinn
- Jonathan
- Jonathan Parker and the Moan T'aye Ghost Dance
- Jonctions
- Jones and the Mammoths
- Jones kezében a világ
- Jordan
- Jordan's Deliverance
- Jordan's Fall
- Jordan's World
- Jornada Sem Limite
- Joseph Conrad's Collection [ 31 Books ]
- Josh Anvil and the Gathering Storm
- Josh Anvil and the Indomitable Power
- Joshua
- Joss
- Jotus of Aanthora
- Jour de Pâques chez les Dragonnets
- Journal Of An Oobax Cowboy
- Journals of the Plague Years
- Journey
- Journey and Jeopardy
- Journey Back To Threa
- Journey for the Souls
- Journey from the Centre of the Earth
- Journey In Time to Cleopatra
- Journey Into the Flame
- Journey of a Battlemage
- Journey of the Pharaohs
- Journey Through the Mirror
- Journey Time
- Journey to Andromeda
- Journey to Disappeared: Discovery
- Journey to Elvander
- Journey to Gone
- Journey To Light: Part I of the High Duties of Pacia
- Journey To Mars, A Space Odyssey
- Journey to Mars: The Denebian Connection
- Journey to Mars: The Vampire Underground
- Journey to the Andromeda Galaxy
- Journey To The Center Of Mars
- Journey to the Center of the Earth
- Journey to the Center of the Earth 4
- Journey to the Centre of the Earth
- Journey To The Mastery