- The Third Lynx
- The Third One
- Third Planet
- The Third Redux
- The Third Science Fiction Megapack
- The Third Sign
- The Third Temple: Book 2 of the AntiChristo Trilogy
- Third Wave
- Third World
- Third, Convictions
- Thirds Rising
- The Thirst Quenchers
- Thirsty Planet, A Novel
- Thirteen
- Thirteen Across
- Thirteen Bones
- The Thirteenth Guardian
- Thirty Strange Stories
- Thirty Years Gone
- Thirty-1 Volume 1: Reckless
- Thirty-1 Volume 2: Salvation
- Thirty-1 Volume 3: Boom
- Thirty-1 Volume 4: The Therabs
- Thirty-1 Volume 5: The Chimera Room
- Thirty-1 Volumes 1 Thru 5
- This Battle Lord's Quest
- This Burning World
- This Connect
- This Crowded Earth
- This Day All Gods Die
- This Fragile Earth
- This Is a True Story!
- This Is How You Die
- This Is Not a Hoax
- This Is Not A Mosquito!
- This is Not a Mosquito!
- This is the Circle
- This is the Way the World Begins
- This Is Where You Start
- This Isn't One of the Stories I Remember
- This New Generation Vol. 1
- This One Problem
- This Ragged, Wastrel Thing
- This Sadness Makes Me Happy
- This Sadness Makes Me Happy
- This Side of Paradise
- This Slaughterhouse Earth
- This Too Shall Collapse
- This Vicious Way: The Dangerous Ones
- This Way to the End Times: Classic Tales of the Apocalypse
- This Will Indeed Be A Little Gem
- This Won't Hurt A Bit: A Story of the Future
- This World is Taboo
- This Would Be Paradise
- Thodkin's Spear
- Thomas
- Thomas Quantum in the Multiverse
- Thomas Sif espace
- Thompson's Bounty: A Ship out of Time
- Thompson's Cat
- Thompsons Time-Travel Theory
- Thompson’s Cat
- Thorn Retro
- The Thorne Inc. Files
- Those Dam Obsidians
- Those Dark Places
- Those Gentle Voices
- Those the Future Left Behind
- Though All the Mountains Lie Between
- The Thought Lab
- The Thought Pushers
- The Thought Readers
- Thoughts That Kill
- Thrall
- Thralls of the Endless Night
- Thrawn (Star Wars)
- The Thrawn Trilogy 3-Book Bundle
- Thrawn: Alliances (Star Wars)
- Thrawn: Treason (Star Wars)
- Thread Skein
- Thread Slivers
- Thread Strands
- Threads of Fate
- Threads of the Conglomerate
- Threads Through the Universe
- The Thread
- Threat Multiplication
- The Threatening Sky
- Threats
- Three
- Three Amazing Tales
- Three Books of Known Space
- Three Card Monte: Book Two of the Martian Alliance Chronicles
- The Three Eyes
- Three Faces of Asprin
- Three Fantastic Tales: Artificial Intelligence, Renaissance Italy, and Interstellar Space
- Three Guys in a Post-Apocalyptic Bar
- Three Hundred Tomorrows
- The Three Hundred Year Old Paradigm Shift
- The Three Infernal Jokes
- The Three Keys Series (Books 1-4)
- Three Kings
- The Three Lives of Sonata James
- The Three Planeteers
- Three Powerful Science Fiction Classics
- The Three Quarters Eaten Dessert
- Three Science Fiction Thrillers
- The Three Scrooges
- Three seconds
- Three Simple Rules (From the Desk of Col. Garrett Ross)
- Three Souls Unrecognized!
- Three Species on Lava World
- Three Survived
- Three Tales For Christmas
- Three Tales of Omne
- Three Tales of Time and Space
- Three Weeks Before Doomsday
- Three Weeks in May
- The Three Words Project: Short Stories Inspired by Readers
- The Three-Body Problem Series
- Three-Day Flight to Freedom
- Three-Quarters Martian
- Threesome Delight : Menage Romance Collection
- Threshold a Seek Team Investigation Book 3
- Threshold of Annihilation
- Threshold of Eternity
- Thrilling Adventures
- Thrilling Adventures 2
- Thrills from the Multiverse: Volume 20
- The Throne of Hades: A ShortBook by Snow Flower