- Solution Uprising : Prossia Book 3
- Soléa
- Sombras en fuga (Saga de la Sombra de Ender 5)
- Some of My Best Friends Are Human
- Some of Your Blood
- Some Will Not Die
- Someone to Remember Me
- Something Blue
- Something Borrowed, Something Doomed
- Something Known
- Something New Every Day
- Something Wild Is Loose
- Something Wild is Loose
- Sometime Tomorrow
- Sometimes We Ran
- Sometimes We Ran 3: Rescue
- Somewhere To Run To
- Sommeil aboli
- Sommeil des arbres-machines (Le)
- Somnium - Eine Reise zum Mond
- Son Cephede Şafak
- Son nom est Sothy: La malédiction du Bouddha d'or
- Son of Man
- Son of the Wolf
- Son of Zog
- Song In a Minor Key
- Song of Death
- Song of Kali
- Song of the Elowai
- Song of the Soulless
- Song Walker: Starseeds One
- Songbird at Midnight
- Songs of Thalassa
- Songs of the Dancing Gods
- Sonhando com as Flores
- Sonhos
- Sonnenstürme
- Sonnentaucher
- Sonno verde
- Sono atomi di stelle
- Sonora IV
- Sons of Baal
- Sons of Taldra
- Sophia The Lonely Electron
- Sophomore Freak
- Sophont
- Sorcerers of Majipoor
- Sorcery & Widgets: Science Fiction and Fantasy Collections 1 & 2
- Sorcery of Thorns
- Sorcière corporate - Tome 1
- Sord in Prosperity - Hope Beyond the Apocalypse
- Sorealle
- Sororate
- Sorrow's Herald
- Sosirea Zeilor
- Sotto il segno dell'ippocampo
- Sottosuolo
- Soul Chambers
- Soul Code
- Soul Cycle (Twisted Souls #3)
- Soul Eater Series (Books 1, 2, 3)
- Soul Equinox
- Soul Match
- Soul Mates Never Die
- Soul of the Stalker
- Soul On Ice (Book 4 of "Working Class Villain")
- Soul Reaper
- Soul Searching
- Soul Thieves
- Soul Trapper
- Soulcore Volume 1
- Soulguard
- Soulless
- Soulless Logic
- Soulless Monk
- Soulmates
- Soulminder
- SoulQuest
- Source of Magic
- Sous des cieux plus cléments
- Sous l'étoile du berger
- South Seas Salvation
- Southern Alliance
- Southshore
- Souvenir vom Atair
- Sovereigns of the Collapse Book 2: The Night of Blind Ambition
- Sovereigns of the Collapse Book 3: The Church of Nuclear Science
- Sovereigns of the Collapse Book 4: Operation Ultimate
- Sovereigns of the Collapse Book 5: Nuclear Nightminster
- Sower
- Soyuz
- Space
- Space 51
- Space Adventure
- Space 51
- Space Adventure
- SPACE ADVENTURES Boxed Set – 8 Novels in One Volume
- Space Available
- Space Blues: Octant Chronicles #1
- Space Bound
- Space Bounty Hunter: Earth Return
- Space Bounty Hunter: The Immortality Backup
- Space Cadets
- Space Capades
- Space Castaway
- Space Chantey
- Space Chase
- Space Chase Book 1: Arrendrallendriania
- Space Colony One
- Space Colony One Books 4 - 6
- Space Contractor Il destino della terra
- Space Cowboy Survival Guide
- Space Crazy
- Space Danger! Nemesis Mine
- Space Danger! The Deadly Planet of DEATH!
- Space Dream Three
- Space Drifters: The Complete Trilogy
- Space Drifters: The Emerald Enigma
- Space Drifters: The Iron Gauntlet
- Space Drop
- Space Expedition to Distant Stars
- Space Freighter Neo Eden
- Space Girls: Saturna 1
- Space Girls: Saturna 2
- Space Gypsies
- Space Hobos
- Space Invaders
- Space Juice: A Sci-fi Misadventure
- Space Junk
- Space Lady
- Space Library
- Space Man's Burden
- Space Marines
- Space Opera
- Space Opera Digest 2021
- Space Pilot Connor Grant
- Space Pioneers
- SPACE PIRATES
- Space Pirates
- Space Platform