- Spark Awakening
- Spark: A Qurilixen World Novella
- Sparkle Pirate
- Sparkles: A Short Story
- Sparks from a Cruel Grindstone
- Sparks: Tales from the Provinces
- Sparrow Dreams
- Spatium Upended - A Trilogy: Book 1
- Spawn
- Spawning Ground
- Spazio di tenebra
- Spazio prima frontiera
- Spazio Profondo
- Speaker to Aliens
- Spear's Journey
- Special relationship between 3 people
- Specialist Class Three
- Specimen 192
- Specimen 959
- Specter of the Monolith
- Specter of the Past: Star Wars (The Hand of Thrawn)
- Spectra's Gabmit
- Spectras Arise Trilogy: Omnibus Edition
- Spectre of El Dorado
- Sped-Bot
- Spekter
- Spell of the Magi
- Spellbinding His Ranger
- Spellbreaker
- Spelunkers
- Spenser
- Spexco
- Spheres of the Ryk-Tar
- Sphinx of Centaurus
- Spice Crimes
- Spice Crimes
- Spicy Space Operas: Five Pulpy Romps Across the Spaceways
- Spider Game
- Spider Mansion
- Spielwelten zwischen Wunschbild und Warnung
- Spin
- Spin Control
- Spin State
- Spin the Sky
- Spindle's End
- Spindoc
- Spindrift
- Spinward Assassin
- Spinward Fringe Broadcast 0: Origins
- Spinward Fringe Broadcast 10: Freeground
- Spinward Fringe Broadcast 11: Revenge
- Spinward Fringe Broadcast 12: Invasion
- Spinward Fringe Broadcast 13: Warriors
- Spinward Fringe Broadcast 14: Rebel
- Spinward Fringe Broadcast 15: Pursuit
- Spinward Fringe Broadcast 16: Hunters
- Spinward Fringe Broadcast 3: Triton
- Spinward Fringe Broadcast 5: Fracture
- Spinward Fringe Broadcast 6.5: The Expendable Few
- Spinward Fringe Broadcast 6: Fragments
- Spinward Fringe Broadcast 8: Renegades
- Spinward Fringe Broadcast 9: Warpath
- Spinward Fringe Broadcasts 1 and 2: Resurrection and Awakening
- Spiral
- Spiral Mirror
- Spirali di ghiaccio
- Spire City, Season One: Infected
- Spire City, Season Three: Unwoven
- Spire City, Season Two: Pursued
- Spirit Island
- Spirit of the Lone Horse
- Spirit of the Towers
- Spirit of War
- Spirit Seeker
- Spirited
- Spiritual Interviews with the Guardian Spirit of George Lucas and the Spirit of Carrie Fisher
- Spiritus ex Machina
- Spit City Hustle
- Spitwrite Box Set: Books 2-4
- Spitwrite Volumes 1-3
- Splashdown
- Splintegrate
- Splinter
- Splinter of the Mind's Eye: Star Wars
- Splinter Salem Part One
- Splinter Salem Part Three
- Splinter Salem Part Two
- SplinterLight
- Split Decision
- Split Image
- Split in Time
- Spoilers: Things Get Worse
- Ashes to Atom: Spoils
- Spoils of War
- Spoken For
- Spooked
- Spooky Action at a Distance
- Spots the Space Marine: Defense of the Fiddler
- Spreadsheet Tyrants
- Spring at Nongoma
- Spuren in der Zeit
- Sputnik’s Children
- Spy Cake? It's Only Fondant