- t ... T’u-chüeh
- T’u-fan ... Ta-li cranium
- Ta-lien ... table tennis
- Tableau comparatif ... Tachyglossus aculeatus
- tachygraphy ... Taenoidea
- Taeuber, Conrad ... Taḥdīd nihāyāt al-amākin li-tasḥīḥ masāfāt al-masākin
- Ṭāherī ... tailcoat
- tailed bracken ... Taiyō
- Taiyō no kisetsu ... Take Me Out
- Take Me Out to the Ball Game ... Talat Paşa
- Talaud Islands ... Taleyarkhan, Rusi
- Talha ... Tāḷḷapāka Annāmācārya
- Tallapoosa River ... Tamana, Mount
- Tamandua tetradactyla ... Tamias rufus
- Tamias sibiricus ... Tan, N. A.
- Tan, Tony ... Tang
- Tang Bohu ... Tanis
- tanistry ... Tantra
- Tantric Buddhism ... tape recording
- tape, magnetic ... Ṭarābulus al-Gharb
- Ṭarābulus ash-Shām ... tare
- Taree ... Tarnów
- Tarnowski, Jan ... Tarumanegara
- Tarŭn naraesŏ ... Tassaert, B. M.
- Tassafaronga, Battle of ... Tate, Larenz
- Tate, Margaret ... Taunus
- Taupin, Bernie ... Tawḥīdī, Abū Ḥayyān al-
- Tawi Tawi ... Taygete
- Taygete ... Taylor, Samuel
- Taylor, Sir Geoffrey Ingram ... TDB
- TDEA ... Team of Rivals: The political Genius of Abraham Lincoln
- team policing ... technology, history of
- Technopaegnion ... Tegeticula maculata
- Teggart, Frederick J. ... Tel Aviv–Yāfa
- Tel Aviv–Yafo ... teleprinter
- teleprompter ... Tellier, Michel Le
- Tellinidae ... temperance
- Temperance Brennan ... tempo e o vento, O
- tempo giusto ... ten-pounder
- Ten-Year Rule ... Teniers, David, the Elder
- Teniers, David, the Younger ... Tenshō Kōtai Jingū-kyō
- Tenshō Shūbun ... Teplostanskaya Upland
- teponaztli ... Terfel, Bryn
- Tergat, Paul ... Termush, Atlanterkysten
- tern ... Terrell, Robert Heberton
- Terrell, Saunders ... Teruel
- Teruel ... Testament of Freedom, The
- Testament of Mary, The ... tetrad
- tetrad ... Tetzel, Johann
- Teucer ... Texas Revolution
- Texas Rising ... Thacker, Charles P.
- Thackeray, Bal ... Thames Yacht Club
- Thames, Battle of the ... That Luang
- That Lucky Old Sun ... The The
- The Vietnam War and the media ... theiosis
- Their Eyes Were Watching God ... theodolite
- Theodor Rshtuni ... Theology of Liberation, A
- Theology of the Old Testament ... Theory of the Location of Industries
- Theory of the Novel, The ... thermal conductivity
- thermal contraction ... thermometer cricket
- thermometry ... Thessaly
- Theta Orionis ... thickening
- thicket ... Thingvalla, Lake
- Thingvallavatn ... Third Republic, constitution of the
- Third Rome ... This is a Chair
- This Is a Recording ... Thomas Jefferson: Author of America
- Thomas l’imposteur ... Thomas, Valerie
- Thomas, Valerie LaVerne ... Thomsen, Grímur
- Thomsen, Hans Peter Jörgen Julius ... Thoreau, Henry David
- Thorek, Max ... thoroughwort
- Thorp, John ... thrasher
- Thrasybulus ... Three Kingdoms, Wars of the
- Three Kings ... Three-Cornered Hat, The
- Three-Cornered Moon ... Throgs Neck Bridge
- thrombi ... Thuja occidentalis
- Thuja orientalis ... Thurium
- Thurles ... thyroid tumour
- thyroid-stimulating hormone ... tianyuan
- Tianzhou 1 ... Ticketmaster
- Tickets for a Prayer Wheel ... Tierra del Fuego
- Tierra del Fuego ... Tigran II the Great
- Tigranes ... Tilghman, B. C.
- Tilghman, Lloyd ... Tim
- Tim Burton’s Corpse Bride ... Time to Love and a Time to Die, A
- Time Transfixed ... Timothy, Letters of Paul to
- Timothy, Saint ... Tingo María
- tingsrätter ... Tipu Sultan
- Tipula simplex ... Tiselius, Arne
- Tiselius, Arne Wilhelm Kaurin ... Tithonus
- titi ... Tjader, Cal
- tjandi ... To Demetrius
- To Die For ... tobacco society
- Tobago ... Todiramphus godeffroyi
- Todleben, E. I. von ... toilet table
- toilet water ... Tokuz Oguz
- Tokwa Daijusho ... tolerance
- tolerance limit ... Tom Strong
- Tom Terrific ... Tomlinson, Alfred Charles
- Tomlinson, Charles ... Tonga, history of
- Tonga, Kingdom of ... Tönnies, Ferdinand Julius
- Tono-Bungay ... Top 40
- Top Banana ... Topper Returns
- Topper Takes a Trip ... Torlonia Museum
- Tormé, Mel ... Torre, Joe
- Torrelavega ... Tortosa
- Tortosa, Disputation of ... total spin angular momentum
- total sum of squares ... Tough Guys Don’t Dance
- Tough Notes: A Healing Call for Creating Exceptional Black Men: Affirmations, Meditations, Readings, and Strategies ... Touroff, Eleanor
- Tours ... Townsend family
- Townsend, Christopher ... Toyota Center
- Toyota Corolla ... Trachypithecus geei
- Trachypithecus obscurus ... Trade Union Congress
- Trade Union Council ... tragelaphine antelope
- Tragelaphini ... Traité d’instrumentation et d’orchestration modernes
- Traité de droit Constitutionnel ... Trans-Alai Range
- Trans-Alai subzone ... transduction
- transduction ... transient without scram
- transient-liquid sintering ... Transorangia
- transorbital lobotomy ... Transverse Ranges
- transverse reaction ... Traugutt, Romuald
- Traum ein Leben, Der ... Travels Through France and Italy
- Travels through North and South Carolina, Georgia, East and West Florida ... Treatise of Japanning and Varnishing
- Treatise of Lorenzo Valla on the Donation of Constantine ... tree climbing
- tree cotton ... Tremain, Rose
- Tremarctos ... Treponema pallidum pallidum
- Treponema pallidum particle agglutination assay ... Triacanthidae
- Triacanthodidae ... Tribhuvan University
- Tribhuvana ... Trichodontidae
- Trichogaster trichopterus ... Trieste
- Trieste ... Trimerorhachoidea
- trimeter ... trionfi
- trionfo ... tripod
- tripod ... tritocerebrum
- Triton ... troctolite
- Troell, Jan ... Trommeln in der Nacht
- Tromostovje ... Tropical Race 4
- tropical rain forest ... Trout, Mike
- trout-perch ... True Confession
- True Confessions ... Trujillo Molina, Rafael Leónidas
- Trujillo Peak ... Truro
- Truro ... trypanosome
- trypanosomiasis ... Tsegaye, Gabre-Medhin
- Tsek’ehne ... Tsugu Akihito
- Tsui Hark ... Tu-22M
- Tu-26 ... Ṭubruq
- Tubu ... tufted cell
- tufted puffin ... tulip mosaic virus
- tulip mussel ... tumour
- tumour biomarker ... Tunhuang manuscript
- tunic ... Tupinamba language
- Tupinambarama Island ... Türck, Ludwig
- Turco ... Turkic languages
- Turkic peoples ... Turner Prize
- Turner syndrome ... Turpin, Richard
- Turpio, Lucius Ambivius ... Ṭūsūn
- Tutammu ... Twain, Shania
- twaite shad ... Twenty-seventh City, The
- twenty-six ... twisting
- twisting dive ... Two Years Before the Mast
- Two Years Before the Mast ... tychism
- Tycho ... type 2 diabetes mellitus
- type 2 FGC ... Typhlomys cinereus
- Typhlonectidae ... Tyrrell, Joseph B.
- Tyrrell, Lake ... Tʿbilisi