- Singularité
- Singurătatea singularității
- Sinner
- Sinner's Delight
- Sins & Science
- Sins and Secrets
- Sins of Her Father
- Sins of Mars
- Sinsee Why Me
- Siobhan Dunmoore: Books 1-3
- Sip
- Sir Arnold: Onkel Adam
- Siren
- Siren's Song
- Sirens Of Theta X
- Sirens Of Theta X: The Return Of The Dragons.
- Sirfla - La fille des protecteurs
- Sirius
- Sirki's Children
- Sirkkusaga
- Siryn
- Sista kvädet
- Sistema Stellare Midway: La flotta contro l’invasione
- Sistemas críticos
- Sister Alice
- Sister Time
- Sister World 2 The Fight for Earth
- Sister World: The Arrival
- Sisterhood of Dune
- Sisters
- Sisters of the Forsaken Stars
- Sisters of the Forsaken Stars
- Sisters of the Vast Black
- Sisu
- Sisyphean
- Sithonia
- Sitting On The Corner
- Six Against the Stars
- Six Concepts for the End of the World
- Six Frightened Men and five more stories
- Six Long Short Months
- Six Moons Before Mating
- Six Scifi Stories Volume Four
- Six Scifi Stories Volume Three
- Six Scifi Stories Volume Two
- Six Six Seven
- Six Wakes
- Six Weeks in the Moon
- Six-Gun Shiva
- Sixth Extinction
- Sixx: Dakonian Alien Mail Order Brides 4 (Intergalactic Dating Agency)
- Skapad för Odjuret
- Skaza na niebie
- Skeleton Men of Jupiter
- Skeleton Wars
- Skells
- Sketches
- Skid Row Pilot
- Skielach
- Skies of Wonder, Skies of Danger
- Skii: Furious Heart
- Skin 2.0: A Cyberpunk Science Fiction Novella
- Skin and Bones
- Skinner Builder in 3 Heartbeats
- Skint Idjit
- Skinwalker's Bane
- Skip Thruster, Space Detective
- Skip Trace
- Skirmishes: A Diving Novel
- Skrymers Glove
- Efter stormen. Skuggvärlden
- Skull's Shadows
- Skulls in the Stars
- SKV -- Smart Killing Virus
- Sky
- Sky Coyote
- Sky Hunter
- Sky Pirate
- Sky Pirate: Safe Harbor
- Sky Walkers Book 2
- Sky Watcher
- Sky-Navy 01: Die letzte Schlacht
- Sky-Navy 04 - Finale auf Regan III.
- Sky-Navy 05 - Das schweigende Schiff
- Sky-Navy 08 - Der Wrack-Planet
- Skyblade's Gambit
- Skydrift: A Steampunk Fantasy
- Skye Byrn
- Skyfall
- Skyfall: Your Heart Will Fall Too
- Skyforged