| thermodynamics | termodinámica |
| thermoelectric | termoeléctrico |
| thermoelectricity | termoelectricidad |
| Thermographic camera | Cámara infrarroja |
| Thermohaline circulation | Circulación termohalina |
| Thermoluminescence dating | Termoluminiscencia |
| thermometer | termómetro |
| thermonuclear | termonuclear |
| thermonuclear weapon | bomba termonuclear |
| Thermoplasma | Thermoplasma |
| thermoplastic | termoplástico |
| Thermopylae | Termópilas |
| Thermopyles | Termópilas |
| thermos | termo |
| thermos bottle | termos |
| thermos flask | termo |
| thermosbottle | termo |
| thermosetting | termofraguante |
| Thermosetting plastic | Plástico termoestable |
| thermosflask | termo |
| thermosphere | termosfera |
| thermostat | termostato |
| thermotherapy | termoterapia |
| Therophyte | Terófito |
| Theropoda | Theropoda |
| Thersites | Tersites |
| thesaurus | diccionario de sinónimos |
| Thescelosaurus | Thescelosaurus |
| these | aquella |
| Theses on Feuerbach | Tesis sobre Feuerbach |
| Theseus | Teseo |
| thesis | tesis |
| Thesmophoria | Tesmoforias |
| Thesmophoriazusae | Las Tesmoforias |
| Thespiae | Tespias |
| thespian | artista |
| Thespis | Tespis |
| Thesprotia | Tesprótida |
| Thessalia | Tesalia |
| Thessalonica of Macedon | Tesalónica de Macedonia |
| Thessaloniki | Salónica |
| Thessaloniki Metro | Metro de Tesalónica |
| Thessaloniki Prefecture | Tesalónica |
| Thessaly | Tesalia |
| Thestius | Testio |
| Theta Eridani | Theta Eridani |
| theta wave | onda theta |
| Thetis | Tetis |
| Thetis Island | Isla Thetis |
| Theudebald | Teodebaldo |
| Theudebert I | Teodeberto I |
| Theudebert II | Teodeberto II |
| Theuderic I | Teodorico I de Austrasia |
| Theuderic II | Teoderico II |
| Theuderic III | Teoderico III |
| Theuderic IV | Teodorico IV |
| Theudigisel | Teudiselo |
| Theudimer | Teodomiro |
| Theudis | Teudis |
| Theudoald | Teodebaldo |
| they | ellos |
| They Call Me Trinity | Le llamaban Trinidad |
| They Live | They Live |
| They shall not pass | No pasarán |
| Thiago Motta | Thiago Motta |
| Thiazolidinedione | Tiazolidinediona |
| Thibet | Tíbet |
| Thich Quang Duc | Thich Quang Duc |
| thick | marcado |
| thick and heavy | denso |
