- Tachash (Jewish) – Large land animal
- Tailypo (American Folklore) (Appalachia) – Powerful animal, that takes revenge on those who steal its tail
- Taimatsumaru (Japanese) – Tengu surrounded in demonic fire
- Takam (Persian) – Nature spirit
- Taka-onna (Japanese) – Female spirit which can stretch itself to peer into the second story of a building
- Talos (Greek) – Giant made of bronze
- Tangie (Scottish) – Shapeshifting water spirit
- Taniwha (Māori) – Water spirit
- Tantankororin (Japanese) – Unharvested persimmon which becomes a monster
- Tanuki (Japanese) – Shapeshifting raccoon dog
- Taotao Mona (Mariana Islands) – Ancestral spirits
- Taotie (Chinese) – Greed spirit
- Tapairu (Mangaia) – Nature spirit
- Tapio (Finnish) – Forest deity
- Tarantasio (Italian) – Dragon
- Tarasque (French) – Dragon with leonine, turtle, bear, and human attributes
- Tartalo (Basque) – One-eyed giant
- Tartaruchi (Christian) – Demonic punisher
- Tatami-tataki (Japanese) – Poltergeist that hits the tatami mats at night
- Tatzelwurm – (Alpine Folklore) lizard-like creature, often described as having the face of a cat, with a serpent-like body which may be slender or stubby, with four short legs or two forelegs
- Tatsu – Japanese dragon
- Taurokampoi (Etruscan) – Fish-tailed bull
- Tavara (Trabzon) – Night-demon[ citation needed ]
- Teju Jagua (Guaraní) – Lizard with seven dog heads
- Tecumbalam (Mayan) – Bird
- Teke Teke (Japanese) – Vengeful spirit of a slain schoolgirl with a half upper-torso body
- Tek-ko-kui (Taiwanese) – Bamboo ghost
- Tengu (Japanese) – Anthropomorphic bird
- Tennin (Japanese) – Angelic humanoid
- Te-no-me (Japanese) – Ghost of a blind man, with his eyes on his hands
- Tepegoz (Azerbaijani) – Azerbaijani mythical creature similar to the cyclops Polyphemus
- Terrible Monster (Jewish) – Lion-eagle-scorpion hybrid made from the blood of murder victims
- Teumessian Fox (Greek) – Gigantic fox
- Te Wheke-a-Muturangi (Māori) – Gigantic octopus
- Theriocephalus (Medieval folklore) – Animal-headed humanoid
- Three hares (Many cultures worldwide) – Symbolic animal
- Three-legged bird (Asia and Africa) – Solar bird
- Thunderbird (Native American) – Avian lightning bird spirit
- Thor (Norse mythology) – God of thunder and storm
- Tiangou (Chinese) – Meteoric dog
- Tianlong (Chinese) – Celestial dragon
- Tibicena (Canarian) – Evil dog
- Tiddy Mun (English) – Bog spirit
- Tigmamanukan (Philippine) – Asian fairy bluebird
- Tigre Capiangos (Argentine) – Jaguar-human shapeshifter
- Tigris (Jewish) – Giant lion
- Tikbalang (Philippine) – Anthropomorphic horse
- Tikoloshe (Zulu) – Little people and water spirit
- Timingila (Hindu) – Sea monster
- Tipua (Māori) – Spirit that protects a specific place
- Titan (Greek) – Primeval god
- Tiyanak (Philippine) – Demons that are souls of dead unbaptized babies
- Tizheruk (Inuit) – Sea serpent
- Tlahuelpuchi (Tlaxcalan) – Shapeshifting vampire
- Tōfu-kozō (Japanese) – Spirit child carrying a block of tofu
- Toire-no-Hanakosan (Japanese) – Ghost who lurks in grade school restroom stalls
- Tomte (Scandinavian) – House spirit
- Topielec (Slavic) – Water spirit
- Tōtetsu (Japanese) – Greed spirit
- Tooth fairy
- Toyol (Malay) – Servant spirit
- Trasgo (Spanish and Portuguese) – Grotesque, mischievous little people
- Trauco (Chilota) – Fertility spirit
- Trenti (Cantabrian) – Diminutive demon
- Trickster – Character in a story which exhibits a great degree of intellect or secret knowledge, and uses it to play tricks or otherwise disobey normal rules and conventional behaviour
- Tripurasura (Hindu) – Demonic inhabitants of Tripura
- Tritons (Greek) – Male human-fish hybrid
- Troll (Norse) – Nature spirit
- Trow (Orkney and Shetland) – Little people and nature spirits
- Tsi-noo (Abenaki) – Vampiric demon
- Tsuchigumo (Japanese) – Shapeshifting, giant spider
- Tsuchinoko (Japanese) – Plump snake-like creature
- Tsukumogami (Japanese) – Inanimate object that becomes animated after existing for 100 years
- Tsul 'Kalu (Cherokee) – Giant nature spirit
- Tsurara-onna (Japanese) – Icicle woman
- Tsurube-otoshi (Japanese) – Monster which drops or lowers a bucket from the top of a tree to catch people
- Tugarin Zmeyevich (Slavic) – Evil shapeshifter
- Tylwyth Teg (Welsh) – Nature spirit
- Tulpa
- Tunda
- Tupilaq (Inuit) – Animated construct
- Turehu (Māori) – Pale spirit
- Turkic mythological figures
- Türst (Swiss) – legendary figure who turns people into dogs
- Turul (Hungarian) – Giant falcon that helped shape the origins of the Magyars
- Tyger (Heraldry) – Like a real tiger, but lacks stripes; has the tufted tail of a lion and a thick mane along the neck like a horse
- Typhon (Greek) – Winged, snake-legged giant
- Tzitzimitl (Aztec) – Skeletal star spirit