- Sleepwalker's World
- Sleepy Time for Captain Eris
- Sleuth Works
- Slingshot 8: Colony
- SLINGSHOT 8: THE OLD WORLD
- Slip/Stream: Red Right Hand
- Slippery Times
- Slipping Through: Journey into different dimensions
- Sloan
- Sloan's Journey
- Slow Apocalypse
- Slow Bullets
- Slubes
- Small Boy
- Small Fry Part Two
- Small Magic
- Smart
- Smoke & Mirrors
- Smoke and Mirrors
- Smoke And Mirrors
- Smoke from the Ashes
- Smoke, Mirrors and Deep Space
- Smoke, Vampires, and Mirrors
- Smokescreen
- Smokestack
- Smoking Mirrors and Other Stories
- Smolif
- Smothered Seas
- Smuggler's Retreat
- Snapdragon Ladies: The Complete 3-Book Science Fiction Adventure Series
- Snow Beast
- Snow Child & Co.Book 1
- Snow Crash
- Snow in the Desert (Short Reads)
- Snow Rage
- Snowbird
- Snowed in with the Alien Beast
- Snowfall
- Snowmaggedon
- Snowy Peaks: A Christian Suspense: Book 2
- So Close To Home
- So Long, and Thanks for All the Fish
- So Many Ways to Die
- So Shall Ye Reap
- So this is Earth?
- So... That Was Odd...
- Social Pictorial Satire
- Socialite 1 Book 1: Bees to Benny
- Socialite 1 Book 2: Mission to Mission
- Socialite 1 Book 3: To Humanize
- Socialite 1 Book 4: Unless Rules
- Sociedade dos meninos gênios
- Society of Temporal Scholars The Probationary Traveler
- Società altamente evolute
- Socks and Pins and Aliens
- Sodom and Gomorrah, Texas
- Softlife
- SOG1- Science Fiction Action Adventure Mystery Series
- Sogni bugiardi
- Sohn der Lüfte
- Sohng
- SoJourn
- Sojourners
- Sol
- Sol Invictus
- Sol Survivor
- Sol's Triad
- Solace of Time
- Solan
- Solar Federation
- Solar Rain: Raging Waters
- Solar Sailing
- Solar Rain: Raging Waters
- Solar Sailing
- Solar Search
- Solar Stiff
- Solar Weapon
- Solaris (Andrei Tarkovsky): Umanitatea dezumanizată
- Solaris Seethes
- Solaris Seethes (The Complete Saga)
- Solaris Soars
- Solaris Strays
- Solarpunk
- SolAs
- Solastria
- Solatium: An Aurora Rhapsody Short Story
- Solder Achieved
- Soldier
- Soldier of Charity
- Soldier of Fortune
- Soldier of Light
- Soldier of the Legion
- Soldierina
- Soldiers Out of Time
- Sole giaguaro
- Sole pirata
- Soledad - Dark Republic Book One
- Solid Solution
- Solitude
- Sollevami
- Solo
- Solo Command
- Solo Elite The Great Awakening
- Solo una brutta giornata
- Solo: A Star Wars Story: Expanded Edition
- Solomon Teacher's Quest
- Solomon's Orbit