- G581: Earth
- G581: The Departure
- Gabekarnian
- Gabriel's Redemption
- Gabriel's Return
- Gabriel's Revenge
- Gabriel: Zero Point
- Gabriella
- Galactic Ancestors
- Galactic Corps
- Galactic North
- Galactic Patrol
- Galaktische Mission
- Galaxienwanderer - Herrscher über Galaxien
- Galaxienwanderer - Mission Schwarzes Loch
- Galaxienwanderer - Raumschiff Caesar
- Galaxienwanderer Zyklus Sammelband 4 Romane
- Galaxies Like Grains of Sand
- Galaxy Rulers
- Gamin Technology
- Garro: Collection
- Garro: End Times
- Gawain
- Gedankendimensionen - Bände 0-4
- Gefallene Engel
- Gefangen auf Tilmun Prime
- Gefangene der Zukunft
- Geheimkommando Chepesch
- GEN - From a Distance (Deutsche Ausgabe)
- Gen Crash
- Gene Mapper
- General Max Shorter and three more stories
- General Overlord Device. Тактик – 2.1
- Generals Help Themselves
- Generations Unbound
- Genesis
- Genesis Sequence
- George Loves Gistla
- Georgia On My Mind and Other Places
- Gesammelte Werke 1
- Gesammelte Werke 2
- Gesammelte Werke 3
- Gesammelte Werke 4
- Gesammelte Werke 5
- Gesammelte Werke 6
- GESTALT
- Get Off My World!
- Gettysburg Revisited
- Ghost Country
- Ghost in the Machine
- Ghost Species
- Ghost Spin
- Ghosts of Atlantis
- Ghosts of the Secret Desert
- Ghosts on the StarSmasher
- Giant Dreams and Dragons
- Giants in the Dust
- Giants on the Earth
- Gibbon's Decline and Fall
- Gift From The Stars
- Gilgameschs Aufstieg
- Giorni verdi nel Brunei
- Gipfelstürmer
- Girl from Above (Books 1 & 2)
- Girl Genes: A Scifi Gender Swap Romance Story
- Give the Hippo What He Wants
- Give the Robot the Impossible Job!
- Giù nei territori
- Glashaus
- Glasshouse
- Gli Anziani
- Gli Illuminati
- Glimpse
- Glimpse Into The Darkness
- Glorious
- Go-Go Girls апокалипсиса
- Goddess of War
- Goddesses & Other Stories
- Gods of Space and five more stories
- Going Dark
- Going Native
- Gold in the Sky
- Gold Rush Mystery
- Golden Fleece
- Golden Gate Volcano
- Goliath
- Goliath: The Graphic Novel
- Golème
- Gone Fishing
- Good Cop, Dead Cop
- Goodbye, Dead Man! And four more stories
- Gran Rojo
- Grand Theft Starship
- Grandfather Anonymous
- Grandfather Ghost
- Grappling with Survival
- Gravewalkers: Thunderhead
- Graviton 2.0
- Gravity Is Heartless
- Gravity of a Distant Sun
- Gravity Waves
- Green Lady
- Green Mars
- Green's Discovery
- Greener Than You Think
- Greenhouse Redemption of the Planet Kraal
- Greenhouse Summer
- Greylorn
- Gridlinked
- Grillbar Galaktyka
- Großband #9 - Chronik der Sternenkrieger: Wo die Erhabenen wohnen: Acht Sternenkrieger Romane
- Großband 5 – Chronik der Sternenkrieger: Sieben Sternenkrieger-Romane
- Guardian Angels and Other Monsters
- Guerra Justa