- The Trouble with Bearclaw
- The Trouble with Borg Tribbles
- The Trouble with Edward
- The Trouble with Jones
- The Trouble with Transporters!
- The Trouble with Tribals
- The Trouble with Tribbles
- The Trouble with Tribbles (CCG)
- The Troubles
- The Truth About Tribbles
- The Truth About Tribbles, Part 1
- The Truth About Tribbles, Part 2
- The Truth Elusive
- The Truth Machine
- The Tunnel of Death
- The Twilight Kingdoms
- The Twilight Zone
- The Two-Front War
- The USS Enterprise NCC-1701-D Illustrated Handbook
- The USS Enterprise NCC-1701 & 1701-A Illustrated Handbook
- The USS Voyager NCC-74656 Illustrated Handbook
- The USS Voyager and Beyond
- The Ultimate Computer
- The Ultimate Klingon
- The Unchartered World
- The Uncollected Songs of Kahless
- The Unconquered
- The Underworld Aliens
- The Undiscovered Country
- The Undying
- The Unforgiven
- The Unhappy Ones
- The Unkindest Cut
- The Unsettling Stars
- The Untouchables
- The Valiant
- The Valiant Little Tailor
- The Vanguard
- The Vanished
- The Vault
- The Vault (STO)
- The Vault (Starfleet)
- The Veil at Valcour
- The Vengeance Factor
- The Vengeance Flies at Morning
- The Very Model
- The Veteran
- The Victim (comic)
- The Victim (short story)
- The Virginian
- The Vision of Judgment
- The Visitor
- The Visual Dictionary
- The Voice of a Falling Star
- The Void (anomaly)
- The Void (episode)
- The Void (region)
- The Void of Storms
- The Voodoo Planet
- The Voth Evolve in the Infinity Lock Box!
- The Voyage Home
- The Voyager Conspiracy
- The Vulcan Academy Murders
- The Vulcan Hello
- The Vulcan Treasure
- The Wake
- The War Without, The War Within
- The War of the Prophets
- The War of the Worlds
- The War to End All Wars
- The Warden
- The Warrior
- The Washington Post
- The Way of D'era: The Romulan Star Empire
- The Way of Kolinahr: The Vulcans
- The Way of the Warrior
- The Way of the Warrior (comic)
- The Way to Eden
- The Way to Exile
- The Way to the Stars
- The Weapon
- The Weight of Worlds
- The Werewolf-Wolf
- The Whale Probe
- The Whiffenpoof Song
- The White Flame Starship Combat Scenario Pack
- The Whorl
- The Wildman Maneuver
- The Winds
- The Wine-Dark Deep
- The Winged Dreamers
- The Wire
- The Wisdom of Kahless
- The Wizard of Oz
- The Wolf Inside
- The World
- The World, the Flesh and the Devil
- The World Beneath the Waves
- The World of Star Trek
- The Worlds of the Federation
- The Wormhole Bar
- The Wormhole Connection
- The Wormhole Trap!
- The Worst of Both Worlds
- The Worst of Both Worlds (comic)
- The Worthy
- The Wounded
- The Wounded Sky
- The Wrath of Khan
- The Wrath of Khan, Issue 1
- The Wrath of Khan, Issue 2
- The Wrath of Khan, Issue 3
- The Wristwatch Plantation
- The Yard
- The Yesterday Saga
- The Young Hunter: A Klingon Folktale
- The Youth Trap
- The Zodian Sacrifice
- The girl who made the stars
- The hub
- The observer
- Theata Leonis system
- Theatre
- Thebes
- Thebes, Egypt
- Thebroca Horven
- Theena elMadej
- Theep
- Thegar
- Thei
- Thelanius Richter
- Thelasa
- Thelasa-vei Province
- Thelasian Trading Confederacy
- Theleb
- Thelemite
- Thelenth
- Thelev
- Thelex
- Thelian (disambiguation)
- Thelian University
- Thelianaresth th'Vorothishria
- Thelin (Captain)
- Thelin th'Valrass
- Thelkan
- Thelonii
- Thelonii system
- Theloss
- Thelossis 1
- Theluvian
- Them
- Themere
- Themerian
- Themis
- Themnorsith ch'Lessa
- Themon
- Thenir
- Thentak
- Theoderich Patterson
- Theodore (disambiguation)
- Theodore Christie
- Theodore Deverick
- Theodore Fitzpatrick
- Theodore Haskins
- Theodore Kim
- Theodore Krajensky
- Theodore Lowrey
- Theodore R. Cogswell
- Theodore Roosevelt
- Theofanous
- Theophrastus class
- Theorems of Governance
- Theoretical Propulsion Group
- Thepnossen
- Thera Tibb
- Theragen
- Theras
- Theras shoorShras
- There's No Place Like...
- There's No Space Like Gnomes'!
- There Is A Tide...
- Theresa Detwiler
- Theresa Errgang
- Theresa Renner
- Theresa Ross
- Therese Liao
- Therhea
- Therin Park
- Thermal concrete
- Thermite
- Thermite grenade
- Thermium
- Thermocoat
- Thermodynamics
- Thermometer
- Thermopylae
- Thermopylae (disambiguation)
- Theron
- Theron class
- Thesalla
- Thesau
- Thescelosaurus
- These Are the Voyages
- These Are the Voyages...
- These Are the Voyages...—A Three-Dimensional Star Trek Album
- These Haunted Seas
- These are the Voyages: Mission Compendium Vol. 1
- Theseus
- Theseus (disambiguation)
- Theseus class
- Theskian
- Thesskira system
- Theta
- Theta-matrix compositor
- Theta 116
- Theta 116 VIII
- Theta Anterial
- Theta Anterial II
- Theta Bowles
- Theta Centauri
- Theta Cobrini
- Theta Cobrini V
- Theta Cygni
- Theta Cygni XII
- Theta Draconis
- Theta Gamma
- Theta III
- Theta IV-Z
- Theta Indi
- Theta Kalyb
- Theta Kiokis
- Theta Kiokis II
- Theta Majoris
- Theta Mariana
- Theta Mariana IV
- Theta Mees
- Theta Omicron
- Theta Pegasi
- Theta Pictoris
- Theta Rill
- Theta Tau
- Theta Tau V
- Theta VII
- Theta VII (Rell's world)
- Theta VII (disambiguation)
- Theta class
- Theta radiation
- Thetalian
- Thetalian Prime
- Thetas Akunas
- Thev
- Thevos system
- Thex
- They Can't Take That Away from Me
- Thezalden ch'Letha
- Thickfur
- Thiemann
- Thieurrull
- Thill
- Thill Revi
- Thimon
- Thin Air
- Thin Ice
- Thine Own Self
- Things Can Only Get Better
- Things Fall Apart
- Things Past
- Think Tank
- Thinking of You
- Thinking planet
- Thirat
- Thirat Group
- Third
- Third (Jem'Hadar)
- Third Bajoran Republic
- Third Battle of Deep Space 9
- Third Battle of Deneva
- Third Great Earth-Romulan War
- Third House of Betazed
- Third Interregnum
- Third Prophecy of Andaki
- Third Republic of Bajor
- Third Submission Colony
- Third War
- Third officer
- Third planets
- Thirijhamel zh'Dhaven
- Thirishar
- Thirishar ch'Thane
- Thirishar ch'Thane (mirror)
- Thirteenth planets
- Thirty-Seven
- Thirty Days
- Thirty Outcasts
- Thirty Tribes
- Thirty Years' War
- This Drone
- This Gray Spirit
- This Side of Paradise
- This Tree Bears Bitter Fruit
- Thisisit
- Thithta
- ThoQ'jI
- ThoQ'jI I
- ThoQ'jI II
- ThoQ'jI III
- ThoQ'jI III-A
- ThoQ'jI III-B
- Thobo
- Thofsin class
- Thok
- Thok Mak
- Thokol
- Tholav
- Tholev Shavahar
- Tholia
- Tholia (planet)
- Tholia One
- Tholian
- Tholian (mirror)
- Tholian Ambassador to the United Federation of Planets
- Tholian Annex
- Tholian Assembly
- Tholian Assembly (mirror)
- Tholian Assembly starships
- Tholian Axiom, First Iteration
- Tholian Diplomatic Starship
- Tholian Emperor
- Tholian Fleet
- Tholian Hive Revolt
- Tholian Incident
- Tholian Incursion Reaction Forces
- Tholian War
- Tholian base
- Tholian battlecruiser
- Tholian cruiser
- Tholian crystal-lattice
- Tholian expansionist programs
- Tholian fighter
- Tholian history
- Tholian lace
- Tholian language
- Tholian silk
- Tholian starship (2290s)
- Tholian tower