List of fictional alien species: T

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Name	Source	Notes
Taalo	Star Control	The only member of the Sentient Milieu known to inhabit the region of space currently occupied by the New Alliance of Free Stars. They are large, rock-like creatures. The unusual silicon-based physiology of the Taalo did not trigger the instinctual territoriality of the Ur-Quan and the two races became friends, resulting in the entrance of the Ur-Quan into the Sentient Milieu. They were highly advanced technologically, their final creation being the Taalo Shield, created in desperation for their allies as a protection against Dnyarri mind-control.
Taelons	Gene Roddenberry's Earth: Final Conflict	Humanoid
Tachidi	Master of Orion III
Tagorians	Noon Universe
Taiidan	Homeworld	Humanoid
Tak Tak	Star Trek
Talan	Outcast
Talarian	Star Trek
Talaxian	Star Trek	Humanoid
Tallerian	Warhammer 40,000
Talokians	DC Comics' Legion of Super-Heroes
Talosian	Star Trek
Tamaraneans	Teen Titans	Humanoid
Tamarian	Star Trek
Tandaran	Star Trek
Tandu	David Brin's Uplift Universe
Tangeans	Buzz Lightyear of Star Command	A humanoid being that can phase through objects and read minds.
Tanndai Techknight	Battlelords of the 23rd Century
Tarellian	Star Trek
Tarentatek	Star Wars
Targum	Umor targumskega diplomata	Plantoid
Tarkans	Farscape	Humanoid
Tarkas	Sword of the Stars
Tasoth	X-COM: Terror from the Deep
Tatanga	Super Mario Land	Humanoid
Tau	Warhammer 40,000	Humanoid
Tavleks	Farscape	Humanoid
Taxxons	K. A. Applegate's Animorphs	Large centipede-like creatures, they have several bug hands and an undying hunger.
Tc'a	C. J. Cherryh's Chanur novels
Tchoung	Valérian and Laureline
Technarchy	Marvel Comics
Tecresean	Battlelords of the 23rd Century
Tellarite	Star Trek
Temarkians	Utopia
Tenctonese	Alien Nation
Tenebrian	Hal Clement's Close to Critical
Tentaculat	X-COM: Terror from the Deep
Terellian	Star Trek	Humanoid
Terileptils	Doctor Who
Terran	Final Fantasy IX
Terra Novans	Star Trek
Terrelian	Star Trek	Humanoid
Terrellian	Star Trek	Humanoid
Terrians	Earth 2	They are humanoid in shape but not in physiology. Their chemical structure is not carbon based and they are symbiotic with their planet and able to move through the soil. They communicate with humans through dreams.
Tetramand	Ben 10
Tetraps	Doctor Who
Thals	Doctor Who
Thalan	Galactic Civilizations II: Dread Lords
Thalians	Star Fleet	They are humanoid in appearance. Due to their mixed appearances, it is unclear if they belong in a definitive race or are many races out of the Thalian Zone after domination from the Imperial Alliance. All have robotic/cybernetic attachments replacing certain parts of their bodies. These range from robotic lobsters/centipedes over one eye to symbiotic talking faces and at least one arm is replaced with a robotic one.
Thalonian	Star Trek
Than-Thre-Kull	Andromeda	Insectoids
Thanagarian	DC Comics
Thargoids	Elite / Captain Kremmen
Thasian	Star Trek
The Thing	Who Goes There?, The Thing from Another World, and The Thing (including a video game sequel, novelization/comic book series, and a prequel)	Parasites that have the capability to shape-shift, thus imitating its hosts after assimilating them.
Therbian (See Aaamazzarite)	Star Trek
Thep Khufan	Ben 10
Theron	Dan Dare stories
Tholian	Star Trek
Thraddash	Star Control	Rhinoceros-like humanoid
Thranx	Alan Dean Foster's Humanx Commonwealth series
Thrint	Larry Niven's Known Space
Tiberians	Buzz Aldrin and John Barnes' Encounter With Tiber
Tilikanthua	Utopia
Time Lords of Gallifrey	Doctor Who	Humanoid
Tines	Vernor Vinge's "A Fire Upon the Deep"	Dog-like group intelligences
"Titans"	Yoko Tsuno	The nickname comes from the fact that they're gigantic insectoids. They have strong telepathic abilities and need cybernetics to survive on an Earth-like planet.
Titanians	DC Comics Legion of Super-Heroes
Titanide	John Varley's Gaea-trilogy
T'Lani	Star Trek
Tleilaxu	Dune universe
Tnuctip	Larry Niven's Known Space
Toclafane	Doctor Who
Tok'ra	Stargate SG-1
To'kustar	Ben 10	This species is created during cosmic storms.
Tollan	Stargate SG-1
Toluen	Imperium Galactica II: Alliances
Tony	"Hetalia"
Torians	Galactic Civilizations
To'ul'h	Orion's Arm
Trabe	Star Trek	Humanoid
Tractators	Doctor Who
Traeki	David Brin's Uplift Universe
Tralfamadorians	Kurt Vonnegut's The Sirens of Titan and Slaughterhouse 5
Tran	Alan Dean Foster's Icerigger
Benvicktor	Ben 10
Transylvanians	Rocky Horror Picture Show
Transformer	Transformers
Trandoshans	Star Wars
Traskans	Farscape	Humanoid
Treecats	David Weber's Honorverse	A six legged cat-like creatures native to the planet Sphinx in the Manticore System. They are a tool using race that loves celery.
Treens	Dan Dare stories
Tribble	Star Trek	Compare with the earlier flat cats from Robert A. Heinlein's The Rolling Stones.
Triceraton	Teenage Mutant Ninja Turtles
Triscene	X-COM: Terror from the Deep
Trilarians	Master of Orion II
Trills	Star Trek
Trillions	Nicholas Fisk	Small collective crystals
Trinocs	Larry Niven's Known Space
Trolls	Homestuck	Trolls that are characterized by their horns and grey colored skin. Beta Universe Trolls hail from the planet Alternia, while Alpha Universe Trolls hail from the planet Beforus.
Tromites	DC Comics' Legion of Super-Heroes
Tsufurujin	Dragon Ball
Tunnel Makers	Einstein's Bridge	Aquatic/Shape shifting
Tusken Raider	Star Wars	Humanoid
Turians	Mass Effect
Twi'lek	Star Wars	Humanoid
Twinsunians	Little Big Adventure
Twonkies	The Adventures of Jimmy Neutron: Boy Genius
Tyranid	Warhammer 40,000
Tzenkethi	Star Trek