- The Third Law
- The Third Life of Ophelia
- The Third Magic
- Third Messenger
- The Third Murray Leinster MEGAPACK®: 15 Classic Stories
- The Third Mystery MEGAPACK®
- The Third Paradox
- The Third Pig & Sleeps With the Fishes
- Third Planet
- The Third Portal
- The Third Prince and the Enemy's Daughter
- Third Princess
- Third Rainbow
- The Third Raven
- The Third Redux
- The Third Science Fiction Megapack
- Third Shift: Pact
- The Third Sign
- The Third Soul Omnibus One
- The Third Symbol
- The Third Temple: Book 2 of the AntiChristo Trilogy
- The Third Temple
- Third Term
- Third Thirsty Thursday on Third Street
- Third Time is a Charm
- Third Time Lucky
- The Third Time Travel MEGAPACK ®: 18 Classic Trips Through Time
- Third Time's A Charm
- Third Time's A Crime
- Third Time's the Charm
- Third Time’s a Charm
- Third to Tumble
- The Third Transformation
- The Third Universal Event Horizon
- Third Warp
- The Third War
- Third Wave
- The Third Western Novel MEGAPACK®: 4 Great Western Novels!
- Third Wheel
- The Third Wheel
- The Third Witch
- Third World
- The Third World
- Third, Convictions
- Third-Type Machines
- Thirds
- Thirds Rising
- Thirst (Ava Delaney #1)
- Thirst For Coffee
- The Thirst for Power
- Thirst for Revenge
- Thirsting for Life
- The Thirst
- Thirsty Planet, A Novel
- Thirteen Across
- Thirteen Bones
- Thirteen Days by Sunset Beach
- Thirteen Guests
- Thirteen Magic Pumpkin Seeds
- Thirteen Maidens
- The Thirteen Masteries
- The Thirteen Relics of Doom
- Thirteen Roses Book Five: Home - An Apocalyptic Zombie Saga
- Thirteen Roses Book Four: Alone - An Apocalyptic Zombie Saga
- Thirteen Roses Book One: Before the Plague - An Apocalyptic Zombie Saga
- Thirteen Roses Book Seven: War - An Apocalyptic Zombie Saga
- Thirteen Roses Book Six: Despair - An Apocalyptic Zombie Saga
- Thirteen Roses Book Three: Beyond - An Apocalyptic Zombie Saga
- Thirteen Roses Book Two: After the Plague - An Apocalyptic Zombie Saga
- Thirteen Short Stories
- Thirteen Stakes
- Thirteen Steps in the Underworld
- Thirteen Supernatural Tales
- Thirteen Tales
- The Thirteen Travellers
- The Thirteen Treasures of Britain
- Thirteen: Stories of Transformation
- The Thirteenth Child
- The Thirteenth Gate (A Gaslamp Gothic Victorian Paranormal Mystery)
- The Thirteenth Guardian
- The Thirteenth House
- The Thirteenth Immortal
- Thirteenth Legion
- The Thirteenth Pillar
- The Thirteenth Psalm
- The Thirteenth Sacrifice
- The Thirteenth Shard
- The Thirteenth Sigil
- The Thirteenth Summer
- The Thirteenth Tower
- The Thirteenth Summer
- The Thirteenth Tower
- The Thirteenth Unicorn
- Thirteenth Werewolf and Other Stories
- Thirttene Friends
- Thirty (Exotiqa World Book Two)
- The Thirty by Thirty Solution
- The Thirty Century War
- The Thirty Cubit Crocodile
- Thirty Days Hath September
- Thirty Hours with a Corpse
- The Thirty Minute War
- Thirty Minutes to Heartbreak Box Set (Books 1-3)
- Thirty Shorts
- 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
- Thirty-Six Steps
- Thirty-Three Days
- This Alien Sympathy
- This Battle Lord's Quest
- This Blood - The Grace Allen Series Book 1
- This Brilliant Darkness (A Dark Contemporary Fantasy)
- This Broken World
- This Burning World
- This Census-Taker
- This Chance Planet
- This Charming Man
- This Close to Sitting Ducks
- This Connect
- This Corner of the Universe
- This Corpse is Full of Birds
- This Crazy Infection
- This Creature Fair
- This Curse
- This Cursed Light
- This Dark Time: Chronicles of Bear Book One
- This Darkling Magic
- This Darkness Got To Give