- Thom Steinhauer
- Thomas
- Thomas (Admiral)
- Thomas (engineer)
- Thomas (planet)
- Thomas Adjustable Power Cell
- Thomas Blair
- Thomas Blair (mirror)
- Thomas Brintone
- Thomas Chafin
- Thomas Chang
- Thomas Edison
- Thomas F. Zahler
- Thomas Ginther
- Thomas Gracin
- Thomas Hadley
- Thomas Halloway
- Thomas Harewood
- Thomas Henry
- Thomas Jackson McCoy
- Thomas Jefferson
- Thomas Jefferson (ship)
- Thomas Jefferson Elementary School
- Thomas Jefferson Memorial Rose Garden
- Thomas Johnson Jr.
- Thomas Laue
- Thomas Lee
- Thomas Leighton
- Thomas Macaulay
- Thomas Marrone
- Thomas Marrone (Lieutenant)
- Thomas McWhirter
- Thomas Mitchell
- Thomas Morrow
- Thomas Odell
- Thomas Oromon
- Thomas Paine
- Thomas Paine class
- Thomas Picard
- Thomas Pucer
- Thomas Pythar
- Thomas Randall
- Thomas Raube
- Thomas Raymond
- Thomas Riker
- Thomas Salisbury
- Thomas Sowell Field
- Thomas Sullivan
- Thomas Sullivan (24th century)
- Thomas Tomorrow
- Thomas Vanderbilt
- Thomas Vincent
- Thomas Warkentin
- Thomas Wolfe
- Thomason
- Thomkins
- Thompson
- Thompson (Captain)
- Thompson (Commander)
- Thompson (Ensign)
- Thompson (Nurse)
- Thompson Knox
- Thon
- Thonis
- Thonolan
- Thonolan IV
- Thopok
- Thor
- Thor (disambiguation)
- Thor Heyerdahl
- Thoram
- Thordororn
- Thordororn (Gravenor system)
- Thordororn (Makus system)
- Thore
- Thorell Verde
- Thori
- Thorian-V
- Thorik
- Thorillian fever
- Thoris (disambiguation)
- Thoris (planet)
- Thoris Amarnis
- Thoris Amarnis IV
- Thorium
- Thorn
- Thorn (Klingon)
- Thorn (Orion)
- Thorn (botany)
- Thoron (Andorian)
- Thoron pistol
- Thoron radiation
- Thoron shield
- Thorpex
- Thorsen
- Thorsland
- Thorsson
- Thortathanal
- Thorvald Pearson
- Thorveldt Jarrow
- Those Old Scientists
- Those Who Play With Cats...
- Thosz Alpha
- Thosz Beta
- Thot
- Thotaru
- Thoth
- Though Hell Should Bar the Way
- Thought-shield
- Thought admiral
- Thought enhancer
- Thought maker
- Thoughts Of War
- Thousand-year eyes
- Thousand Gods
- Thousands of years ago
- Thozyn class
- Thracian
- Thracium
- Thragg
- Thrai
- Thrai (Romulan)
- Thrai (disambiguation)
- Thrai class
- Thrakkite
- Thralen
- Thrall
- Thrandasar v'Elex
- Thrann
- Thranstor
- Thranstor IV
- Thrantira zh'Zulis
- Thraq
- Thrasslith
- Thrax
- Thrax (disambiguation)
- Thrax Sa'kat
- Thraxis
- Thraz
- Thraz Outpost
- Thraz Streamer
- Thraz system
- Three
- Three-dimensional chess
- Three-year mission
- ThreeTimes
- Three Lubak
- Three Mile Island
- Three Sides to Every Story
- Three Turn Bridge
- Threkkle
- Threlas ch'Lhren
- Threllian
- Threllvia
- Threllvia IV
- Threshold
- Threska II
- Thress
- Thriazhrovarasa sh'Meth
- Thrice written and thrice burned
- Thrichduk
- Thrifis Chovich
- Thrint
- Thrintarno zh'Lan
- Thris class
- Thrishia
- Thriv
- Thrix
- Throck
- Throck-haired shirt
- Throckmorton
- Throk
- Thron
- Through a Glass, Darkly
- Through the Looking-Glass, and What Alice Found There
- Through the Looking Glass
- Through the Looking Glass (episode)
- Through the Looking Glass (short story)
- Through the Mirror
- Through the Mirror, Issue 1
- Through the Mirror, Issue 2
- Through the Mirror, Issue 3
- Through the Mirror, Issue 4
- Through the Mirror, Issue 5
- Through the Valley of Shadows
- Thrush
- Thruster
- Thruzen
- Thrynn
- Thucydides
- Thucydides class
- Thue
- Thufir class
- Thugee
- Thulas
- Thule G'Dok Glemoor
- Thulium
- Thunder lily
- Thunderbird
- Thunderbird (disambiguation)
- Thunderchild
- Thunderchild class
- Thunderlizard class
- Thunderstorm
- Thunderstroke
- Thur chim Gliv
- Thurgood Marshall
- Thurl
- Thurl (disambiguation)
- Thuvis
- Thwa Minha
- Thy'kir Shran
- Thy'lek Shran
- Thy'lek Shran (mirror)
- Thylaster
- Thyme
- Thymerae
- Thymoxamine
- Thyner
- Thyrion VI
- Thysis
- Thyzin
- Thérèse Su
- Ti'Ana
- Ti'Mur
- Ti'Mur (mirror)
- Ti-Chen
- Ti Che
- Tia Daraan
- Tiananmen Square
- Tiantianium
- Tiaren
- Tiaru Jarok
- Tib'vor
- Tiba
- Tiber
- Tiber (disambiguation)
- Tiber River
- Tiber sector
- Tiberian sloth cat
- Tiberius
- Tiberius (Magna Roman)
- Tiberius (disambiguation)
- Tiberius Kirk
- Tiberius Sejanus Singh
- Tiberius class
- Tibet
- Tibidex
- Tibura Secundus
- Tiburon
- Tiburon (disambiguation)
- Tiburon (planet)
- Tiburon (planet) (mirror)
- Tic-tac-toe
- Tichar
- Tickle My Lobes and Tell Me That You Love Me
- Ticonderoga
- Ticonderoga class
- Tier Arooth
- Tieran
- Tiercel
- Tiercel class
- Tiercellus
- Tiercellus (disambiguation)
- Tierenios
- Tierra
- Ties of Blood and Water
- Tiet
- Tifel
- Tigan
- Tigan (disambiguation)
- Tigan VII
- Tigan central computer
- Tigan interface
- Tigan system
- Tigart Hedda
- Tigelis
- Tiger
- Tiger (disambiguation)
- Tiger FS-100
- Tiger FS-101
- Tiger FS-102
- Tihana Elkhur
- Tik'ik
- Tik'leth
- Tik'r Tholis
- Tika
- Tika cat
- Tikal Province
- Tikar Antol
- Tikelis
- Tikelis I
- Tikelis II
- Tikka Rillio
- Tiklor
- Tikopai
- Tikopai class
- Tiku
- Til'amin froth
- Til'k
- Tilar
- Tilar Peninsula
- Tilar plate
- Tiliul
- Tiljara
- Tillean Murat
- Tiller
- Tiller MiVeit
- Tillie
- Tillis
- Tillotson
- Tillum Drafar
- Tilly's shuttle
- Tilly (disambiguation)
- Tilo
- Tilting Point
- Tiluvus Gallery
- Tim
- Tim'pek
- Tim (disambiguation)
- Tim Abercrombie
- Tim Bradstreet
- Tim Earls
- Tim Henry
- Tim Jones
- Tim Lincoln
- Tim Lounibos
- Tim McAddis
- Tim Pennington
- Tim Roller
- Tim Russ
- Tim Watters
- Tima
- Timber weevil
- Timbisha
- Timbor
- Timbuktu
- Time
- Time's Arrow
- Time's Echo
- Time's Enemy
- Time's Orphan
- Time-pod
- Time-warp speed
- Time. And Time. And Time Again.