| Trentino-Alto Adige | Trentino-Alto Adige |
| Trento | Trento |
| Trenton | Trenton |
| trentotto | thirty-eight |
| trentuno | thirty-one |
| Trenčianska Teplá | Trenčianska Teplá |
| Trenčianska Turná | Trenčianska Turná |
| Trenčianske Jastrabie | Trenčianske Jastrabie |
| Trenčianske Mitice | Trenčianske Mitice |
| Trenčianske Stankovce | Trenčianske Stankovce |
| Trenčianske Teplice | Trenčianske Teplice |
| Trenčín | Trenčín |
| treonina | threonine |
| Trepak | Trepak |
| trepidazione | trepidation |
| Treponema pallidum | Treponema pallidum |
| treppiede | tripod |
| treppiedi | tripod |
| Treptow-Köpenick | Treptow-Köpenick |
| trequarti | three-quarter back |
| tresca | liaison |
| Treuchtlingen | Treuchtlingen |
| Trevanian | Trevanian |
| Treveri | Treveri |
| Treviglio | Treviglio |
| Treviri | Trier |
| Treviso | Treviso |
| trevolte | thrice |
| Trevor | Trevor |
| Trevor Berbick | Trevor Berbick |
| Trevor Pinnock | Trevor Pinnock |
| Trey Gunn | Trey Gunn |
| Trey Parker | Trey Parker |
| Treycovagnes | Treycovagnes |
| Treytorrens | Treytorrens |
| Treyvaux | Treyvaux |
| Trezene | Troezen |
| Trezoi | Trezoi |
| Trgovište | Trgovište |
| Trhisong Detsen | Trisong Detsen |
| Tri Nations | Tri Nations |
| tri- | tri- |
| Tria nomina | Roman naming conventions |
| Triacisicosaedro | Triakis icosahedron |
| Triacisottaedro | Triakis octahedron |
| Triacistetraedro | Triakis tetrahedron |
| triacontaedro | triacontahedron |
| Triacontaedro rombico | Rhombic triacontahedron |
| triade | triad |
| Triadi gallesi | Welsh Triads |
| Trial by Fire - Live in Leningrad | Trial by Fire |
| triangolare | triangular |
| triangolazione | triangulation |
| triangolo | triangle |
| Triangolo Australe | Triangulum Australe |
| Triangolo del fuoco | Fire triangle |
| Triangolo delle Bermuda | Bermuda Triangle |
| Triangolo delle Bermude | Bermuda Triangle |
| Triangolo di Afar | Afar Depression |
| Triangolo di Penrose | Penrose triangle |
| Triangolo di Reuleax | Reuleaux triangle |
| Triangolo di Sierpinski | Sierpinski triangle |
| triangolo equilatero | equilateral triangle |
| Triangolo Estivo | Summer Triangle |
| Triangolo Invernale | Winter Triangle |
| Triangolo iperbolico | Hyperbolic triangle |
| Triangolo nero | Black triangle |
| Triangolo ortico | Pedal triangle |
| triangolo rettangolo | right triangle |
| Triangolo rosa | Pink triangle |
| Triangolo rosso | Red inverted triangle |
| triangolo scaleno | scalene triangle |
| Triario | Triarii |
| Triassico | Triassic |
| Triathlon alle Olimpiadi | Triathlon at the Summer Olympics |
| Tribal Wars | Tribal Wars |
| tribale | tribal |
| Triballi | Triballi |
| tribasico | tribasic |
| Triberg im Schwarzwald | Triberg im Schwarzwald |
| Tribhuvan Bir Bikram Shah Dev | Tribhuvan of Nepal |
| Tribler streaming | Tribler |
| triboelettricità | triboelectricity |
| tribolazione | tribulation |
| tribologia | tribology |
| Triboniano | Tribonian |
| tribordo | starboard |
| Tribromuro di fosforo | Phosphorus tribromide |
| tribulo comune | caltrop |
| tribuna | stage |
