- S I, the Trilogy
- S'il suffisait d'aimer
- Soldier Where Art Thou?
- S1-R3N
- Sa Compagne Vierge
- Saber
- Sabia Zeilor (Ediția română)
- Sabikui Bisco, Vol. 1 (light novel)
- Sabikui Bisco, Vol. 2 (light novel)
- Sabin: Alien Warrior
- Sabina Saves the Future: Complete Trilogy
- Sabina's Expedition to Stop the Apocalypse
- Sabina's Quest to Open the Portal in the Sun Pyramid
- Sabinas jakt på den heliga graalen
- Sabotage in Space
- Saboteur: Star Wars (Darth Maul)
- Sabre Black
- Sac'a'rith: Rebirth
- Sacerdotisa de la Eggstone
- Sacraments of Fire
- Sacred Charge
- Sacred Chronicles
- Sacred Ground
- Sacred Locomotive Flies
- Sacred Tenets
- Sacred Water, Book 2, The Time Before
- Sacrifice
- Sacrifices
- Sad Grey Eyes on Tharsis
- Sadie Walker Is Stranded
- Sadness Belongs to the Universe
- Safari bianco
- Safari World
- Safehold Boxed Set 1
- Safespace
- Saffron
- Saga of the Scout
- Sailing the Cosmos
- Sailor to a Siren
- Saint Hiroshima
- Saint Nicholas University
- Salad Days
- Sales Talk
- Saline
- Saline Solution
- Salmon for Satan
- Salmon Run Collection (Salmon Run - Books 1-3)
- Salomé Book 1: The Prophecy
- Salomé Book 2: Revelation
- Saltos y asaltos del piloto Jim
- Salut Delcano !
- Salvage
- SALVAGE MERC ONE
- Salvage Rites
- Salvage Trouble
- Salvage-5
- Salvage-5 (Another Mission)
- Salvage-5: Final Mission
- Salvaged
- Salvagers
- Salvaging Outer Space: Laruge's Salvage Journal 1
- Salvation Day
- Salvation Polarity
- Salvi
- Sam & Samantha
- Sam, This is You
- Sammelband Chronik der Sternenkrieger 22 Romane Commander Reilly #1-22
- Sammelband Die Wormhole-Affäre Band 1-6 Sechs SF-Romane.
- Sams Sohn Saga
- Sams Sohn Teil 1 und 2
- Sams Sohn Teil 3
- Sams Sohn Teil 4
- Sams Sohn Teil 5
- Samuel and the Soul Collector
- San Diego 2014: The Last Stand of the California Browncoats
- Sanación "The Black Hole Mission"
- Sanación II “We Are the Aliens”
- Sanction
- Sanctuary
- Sanctuary of the Damned
- Sanctuary Planet: Agents of ISIS, Book 4
- Sanctum 92
- Sand Doom
- Sand Fall: The Complete Trilogy
- Sand Glass
- Sand Historie
- Sandaara
- Sanders Experiment
- Sanders Experiment II: Rivalry
- Sandokán
- Sanders Experiment II: Rivalry
- Sandokán
- Sandrider
- Sands of Dune
- Sandstorm Box Set: The Complete Dystopian Science Fiction Series
- Sandstorm på Mars
- Sandstorm: A Dystopian Science Fiction Story
- Sandworms of Dune
- Sang de Mirial (Le)
- Sang pour sang
- Sangue Maremmano. L'alba di una cittadina
- Sankor Sangres: Mercenary For Hire
- Sans dessus dessous
- Sans dessus dessous – suivi d'annexes
- Sans Terre Sans Destin
- Santorini Blues
- Santuario
- Santuário Ilfin
- Saphora vol. 2 Residence
- Saphora vol.1 Retention
- Sapphire Phoenix
- Sar-El of Sirius: A Cosmic Adventure!
- Sara's Paradox
- Saradasi-The Prophecy
- Saradasi-The Search
- Sarah J. Maas: Series Reading Order - with Summaries & Checklist
- Sarah Tries to Save the World: a post-apocalyptic novella
- Sarangkôr: Drei Logan-Romane
- Sarara
- Sargasso of Space
- Sasha: Book 1 of The ROE Chronicles
- Sashay to the Centre of the Earth
- Satan's Campfire
- Satin & Sutherland - The Golden Curse
- Satisfaction Guaranteed
- Saturn
- Saturn im Morgenlicht
- Saturn Run
- Saturn Stolen
- Saturn's Children
- Saturn's Ringmaster
- Saucer
- Saucer! Saucer!
- Saucer: Savage Planet