- J. R. Kruze Short Story Collection 01
- J.J. Green Reading List
- J.S. Cook's Greatest Hits
- J2
- Ja Rel Sunstormer and the Port Controller of Cruzar
- Jachère
- Jaci's Experiment
- Jacinda's Challenge
- Jack and the Demonic Disco Ball of Doom
- Jack Be Nimble
- Jack Cloudie
- Jack Commer, Supreme Commander
- Jack Daddy
- Jack Elopes
- Jack Glass
- Jack In The Box
- Jack In The Warren
- Jack Kane and the Kaiser
- Jack Kane and the Statue Of Liberty
- Jack of Eagles
- Jack of No Trades
- Jack Strong
- Jack the Bodiless
- Jack Williamson SF Gateway Omnibus
- Jack's Paradox A Sci-Fi Writer’s Alien Dilemma
- Jacked-In
- Jackie's Boy
- Jackpot
- Jacks Are Wild: An Out of Time Novel
- Jacks Company
- JackSimile and the Phantom Fury
- Jackson's Rangers: The Volunteer
- Jaclyn the Ripper
- Jacob's Bridge
- Jacob's Pony
- Jadde – The Fragile Sanctuary
- Jade Darcy and the Affair of Honor
- Jade Sky
- Jag : Les Vierges de pierre
- Jag heter Saga Torstensson
- Jagd auf Ikarus
- Jager
- Jaguar IV
- Jahrtausendwende
- Jailmates
- Jairal
- Jake & Chearice: Cell Phone Conspiracy
- Jake & Chearice: Lightspeed
- Jake Bonner!
- Jake Djones - Die Dynastie des Bösen
- Jake Djones - In der Arena des Todes
- Jake's Last Mission
- Jalin Ka
- Jam
- James Blish SF Gateway Omnibus
- Jamieson
- Jan (The Complete Chronicles)
- Jan And The Spooky Periscope Incident - The First Two Stories
- Janaya
- Janissaries
- Jansha
- January Fifteenth
- Janus Arrival: Journey's End
- Janus Challenge: The Journey
- Janus the Arrival
- Janus the Offspring
- Janus the Sandlings
- Japan Sinks
- Jaran
- Jaron's Promise
- Jasmyn
- Javelin Rain
- Jawk
- Jaws of Darkness
- Jaws of Death
- Jax - Warrior Lover 1
- Jay Horne's O-Zone
- Jazon
- Jazz
- Je suis la fin du monde
- Je suis la Mort
- Jed the Dead
- Jedi Search: Star Wars (The Jedi Academy)
- Jeffty ist fünf
- Jegra Destroyer of Galaxies
- Jegra Gladiatrix of the Galaxy
- Jegra Imperatrix of the Galaxy
- Jellyspace
- Jenkins & Sinclair. La maldición de Amonkatûr
- Jenkins & Sinclair. La máquina de Atwood
- Jenna Starborn
- Jenseits aller Galaxien: Science Fiction Sammelband
- Jenseits der Dämmerung
- Jenseits der Sehnsucht
- Jenseits der Sterne
- Jenseits der Zeit
- Jenseits von Ninive
- Jeremiah Willstone and the Clockwork Time Machine
- Jeremiah's Codes
- Jeremy's Potential
- Jericho Falling
- Jerry Cornelius: His Lives and His Times