- t ... T’u-lu-f’an P’en-ti
- T’u-men Chiang ... Ta-li cranium
- Ta-lien ... table tennis
- Tableau comparatif ... Tachyeres
- Tachyeres brachypterus ... Taenia saginata
- Taenia solium ... Tahāfut al-falāsifah
- tahajjud ... tail of a comet
- tail pulse ... Taiwan, flag of
- Taiwan, history of ... Takayama
- Takayanagi 7×7 structure ... tala
- Talā-ye sorkh ... Tales of Hulan River
- Tales of Ise ... Tall Rifʿat
- Tall Sankarah ... tama
- Tama ... tamburi
- Tamburini, Antonio ... Tan
- tan ... Tandil
- Tandja, Mamadou ... Tangut
- Tangut ... Tanomura Chikuden
- Tanomura Kōken ... Tapajó
- Tapajós ... Tar
- tar ... Tarbes
- tarboosh ... tarkīb-band
- Tarkington, Booth ... tartaric acid
- Tartarus ... Tasman Peninsula
- Tasman Sea ... Tatar Strait
- Tatara Bridge ... tau protein
- Tau Sug ... Taverner, John
- Taveuni Island ... Taxis postal system
- Taxis, Franz von ... Taylor, Kamala
- Taylor, Koko ... taʿṭīl
- taʿzīr ... tea blight bug
- tea caddy ... teatro por horas
- Teatro sintetico futurista ... Tedaga
- Tedania ignis ... Teignbridge
- Teignmouth ... teleconverter lens
- Telecote Tunnel ... Teletypesetter
- teletypewriter ... Telong Melintang
- telophase ... temperature-dependent sex determination
- temperature–humidity index ... temporary insanity
- temporary lake ... Tenasserim Range
- Tenasserim Yoma ... Tennant Creek
- Tennant, Charles ... tension pneumothorax
- tension wood ... Tequila and Bonetti
- Tequila Sunrise ... Terjung’s Comfort Index
- Terjung, Werner H. ... Terneuzen
- Ternezas y floras ... terrestrial ecosystem
- terrestrial equator ... Terylene
- terza rima ... Testament of the Lord
- Testament, Le ... tetrad
- tetradecanoic acid ... TEU
- Teucer ... Texas Rangers, The
- Texas red oak ... Thābit ibn Qurrah
- Thābit wa al-mutaḥawwil, Al- ... Tham Khuyen Cave
- Thames Barrier ... Thasus
- That ’70s Show ... The 7 Best Pinecones (Really!)
- The Afterlife of Miguel de Cervantes ... The Hidden Dangers of Land Mines
- The Hindenburg, Before and After Disaster ... The Solar Eclipse That Made Albert Einstein a Science Celebrity
- The Spiritual Exercises ... theatrical costume
- Theatrical Mission of Wilhelm Meister, The ... Themistius
- Themistocles ... Theodosian Code
- Theodosiopolis ... Theorie der Parallellinien, Die
- Theorie der Transformationsgruppen ... There Your Heart Lies
- There’s a Girl in My Soup ... Thermidor
- Thermidor ... Thesaurofacet
- thesaurus ... They Were Expendable
- They Who Step on the Tiger’s Tail ... Thieu, Nguyen Van
- thieves cant ... thiomersal
- Thiong’o Ngugi, James ... Thirteen Articles
- Thirteen Articles of Faith ... This Sporting Life
- This Storm ... Thomas, Augustus
- Thomas, Betty ... Thompson, Cecil
- Thompson, Charles E. ... Thomson, James
- Thomson, James ... thorium-232
- Thorkell the Tall ... Thorvaldsen, Bertel
- Thorvaldson, Erik ... Threads
- Threads ... Three Musketeers, The
- Three Musketeers, The ... three-field system
- Three-fifths compromise ... thrombopoietin
- thrombosis ... thulium
- thulium-169 ... Thurman, Uma Karuna
- Thurman, Wallace Henry ... thyrotropin
- thyrotropin releasing factor ... Tiaret
- Tiarnoglofi ... Ticknor, George
- tickseed ... Tierra del Fuego
- Tierra Firme fleet ... Tigrai language
- Tigran II the Great ... tile
- tile ore ... tilting, automatic body
- Tilton v. Richardson ... Time Pieces: A Dublin Memoir
- time preference ... Times They Are A-Changin’, The
- Times, The ... tinaja
- Tinamiformes ... tintinnid
- Tintinnida ... Tirnovo
- Tiro, Marcus Tullius ... Tiszaeszlár Affair
- Tiszalök Dam ... Titulescu, Nicolae
- tituli ... Tlemcen
- Tlemcen, Great Mosque of ... To See, to Take
- To Sir, with Love ... Toby Philpot
- Tobyl River ... Toeschi, Carlo Giuseppe
- Toews, Jonathan ... Tōkai region
- Tōkai-chihō ... Tokyo Rose
- Tokyo Round ... Toll signaling pathway
- toll-like receptor 4 ... Tomás and the Library Lady
- Tomas Tranströmer: Selected Poems 1954-1986 ... Tommy Boy Records
- Tommy Boy Records: Rocking the Planet from West 85th Street ... tonggu
- Tongguan ... Tontio
- Tonto ... top heading and bench method
- top iron ... Toprak Kale
- Toprakkala ... Tornado Alley
- tornado core ... Torrence, Ridgely
- Torrens Title system ... Tortricoidea
- Tortrix viridana ... Totalfina
- TotalFinaElf ... toughened glass
- Toughest Indian in the World, The ... Touroff, Eleanor
- Tours ... Townsend avalanche
- Townsend club ... Toyokawa
- Toyokuni ... Trachylina
- Trachylobium verrucosum ... trade rat
- Trade Reform Bill ... tragedy of blood
- Tragedy of Brady Sims, The ... Training and Enterprise Council
- Training Day ... tranquiliser
- Tranquility, Sea of ... transcranial magnetic stimulation
- transcriptase ... transhumanism
- transhydrogenase ... transmission dynamometer
- transmission electron microscope ... Transvaal jade
- Transvaal Ndebele ... Trashing the Planet
- Trasimene, Battle of ... Travelling Lady, The
- Travelling North ... Treasure Island
- Treasure Island ... Trebek, George Alexander
- Trebia ... Trefaldwyn
- Treffertheorie ... Trent Affair
- Trent Bridge cricket ground ... Treveri
- Trèves ... triangular point
- Triangular Road ... tricalcium aluminate
- tricalcium phosphate ... trickery
- Trickett, Libby ... Trigonoceps occipitalis
- Trigonometria Britannica ... Trinidad, Félix
- Trinil ... Triple Alliance, Treaty of the
- Triple Alliance, War of the ... Trist, N. P.
- Trist, Nicholas ... Triumphal Way
- Triumphes of Oriana, The ... Troisgros, Jean
- Troisgros, Pierre ... tropaion
- troparion ... Trostan
- trot ... TRS-80
- trsna ... true mountain mahogany
- True Names of Birds, The ... trump suit
- Trump Tower ... Truth About Lorin Jones, The
- Truth About Love, The ... ts’ung
- TSA ... Tshisekedi, Étienne
- Tshisekedi, Félix ... tsunami warning system
- tsunami, Indian Ocean ... Tuba
- tuba ... Tucana
- tucano ... Tugdamme
- Tugela Falls ... Tull, Jethro
- Tullaghoge ... tumour necrosis factor ligand superfamily member 15
- tumour registry ... tunica adventitia
- tunica albuginea ... Tupinambis merianae
- Tupinambis quadrilineatus ... Turcotte, Ron
- Turda ... Turkish Angora cat
- Turkish Baroque ... Turner Ward Knob
- Turner’s syndrome ... Turpin, Randy
- Turpin, Richard ... tussie-mussie
- Tussman, Malka Heifetz ... TVS
- Twa ... Twenty-one
- Twenty-One Balloons, The ... Twisleton-Wykeham-Fiennes, Sir Ranulph, 3rd Baronet
- twist ... Two Sides of the Moon: Our Story of the Cold War Space Race
- Two Sisters, The ... TWT
- TWV ... Tyndall Glacier
- Tyndall phenomenon ... typecasting machine
- Typee ... Tyrconnell
- Tyrconnell, Richard Talbot, earl of ... Tzu Ssu
- Tzu-chih t’ung-chien ... Tết Nguyên Ɖán
