- Star Wars: Thrawn: Alliances (Book 2)
- Star Wars: Thrawn: Treason (Book 3)
- Thread Skein
- Thread Slivers
- Threadbare
- Threads of Conceit
- Threads of the Conglomerate
- The Threat : Human Enhancement Technology
- Threat Display
- Threat Multiplication
- Threat On The Horizon
- Threats
- Three
- Three A.M.
- Three Aliens Walk Into A Bar
- Three By Laumer
- Three Classic Novels
- Three Days
- Three Days in April
- Three Early Novels
- The Three Electroknights
- The Three Eyes
- Three Fae Monte
- Three Go Back (Science Fiction Classic)
- Three Guys in a Post-Apocalyptic Bar
- Three Hearts & Three Lions
- Three Hours to the Apocalypse
- Three Hundred Years Hence
- Three Keys in the Desert
- Three Kings
- Three Miles Down
- Three Moments of an Explosion: Stories
- The Three of Spades: Part 8 of the Red Dog Conspiracy
- The Three Planeteers
- The Three Stigmata of Palmer Eldritch
- Three Survived
- Three Tales For Christmas
- Three Words from Oblivion (AEGIS Roaming Nova Saga Book 1)
- Three Worlds of Futurity
- Three Worlds to Conquer
- The Three-Legged Hootch Dancer
- The Three
- Threshold of Annihilation
- Threshold of Eternity
- The Threshold
- Thrilled to Death Volume One
- The Throne of Hades: A ShortBook by Snow Flower
- The Thrones of Kronos: Exordium 5
- Through a Blind Man's Eyes
- Through Anguish
- Through Chaos
- Through Ddaera's Touch: Paradisi Chronicles
- Through Fiery Trials
- Through Glass Darkly - Book 1 in the Glass Darkly diesel-punk series
- Through Many Vices
- Through my Eyes. Again.
- Through Space And Time
- Through Tangled Nerves
- Through the Darkness
- Through the Eye of a Needle
- Through the Eye of Time
- Through the Eyes of an Interloper
- Through the Flames
- Through the Hostage
- Through the Jukebox: Five Jukebox Science Fiction Short Stories
- Through the Land of Cloud and Leaf
- Throwaways
- ThrowBack
- The Thrust
- Thumar
- Thumb
- The Thunder and Lightning Series
- Thunder and Roses
- Thunder in the East
- Thunder Mountain
- The Thunder Mountain Series Reading Order Guide
- The Thunder Mountain Starter Bundle
- Thunder of Time
- The Thunder of Vengeance
- The Thunder of War
- Thunder Struck
- Thunder to Venus
- Thunder Wells
- Thunderbird
- The Thunderbird Affair (Jack of Harts Short Story 2)
- Thunderbolt
- The Thunderbolt Affair
- Thunderstrike!
- Thursday Midnight
- The Thursday Next Collection 1-3
- Thursday's Child
- Thus Falls the Shadow
- Thuvia vierge de Mars (Cycle de Mars n° 4)
- Thuvia, Maid of Mars (Annotated)
- Thuvia, vierge de Mars (La princesse de mars)
- Thần hộ mệnh bóng đêm
- Tiamat's Wrath
- Tiboluminator
- Tide and Tempest: A Dystopian Historical Fantasy
- Tide of Shadows and Other Stories
- The Tides of Altamar
- Tides of Light
- Tides of Mars (Omnibus Version)
- Tides of War
- The Tie That Binds
- Tied up in Customs
- Tiempo de cambios
- Tiempo para amar
- The Tiger Catcher
- The Tiger's Tale
- The Tilian Cure