| Theresia van Portugal | Teresa of Portugal |
| Theresia van Saksen-Hildburghausen | Therese of Saxe-Hildburghausen |
| Theresienfeld | Theresienfeld |
| Theresienstadt | Terezín |
| Theriiformes | Theria |
| Therizinosauria | Therizinosaur |
| Therizinosaurus | Therizinosaurus |
| Thermal Design Power | Thermal Design Power |
| Thermalbad Wiesenbad | Thermalbad Wiesenbad |
| Thermen van Caracalla | Baths of Caracalla |
| Thermen van Diocletianus | Baths of Diocletian |
| Thermen van Trajanus | Baths of Trajan |
| Thermidor | Thermidor |
| thermiet | termite |
| Thermietlassen | Aluminothermic reaction |
| thermisch | thermal |
| Thermisch-elektrische zonne-energie | Solar thermal energy |
| thermistor | thermistor |
| Thermobarisch wapen | Thermobaric weapon |
| thermodynamica | thermodynamics |
| Thermogravimetrische analyse | Thermogravimetric analysis |
| Thermohaliene circulatie | Thermohaline circulation |
| thermohardend | thermosetting |
| Thermoharder | Thermosetting plastic |
| Thermokoppel | Thermo-couple |
| Thermoluminescentie | Thermoluminescence dating |
| Thermolyse | Thermal decomposition |
| thermometer | thermometer |
| Thermometervogel | Malleefowl |
| thermonucleair | thermonuclear |
| thermoplast | thermoplastic |
| thermoplastisch | thermoplastic |
| Thermopylae | Thermopylae |
| thermosfeer | thermosphere |
| thermosfles | thermos |
| thermoskan | thermos |
| thermostaat | thermostat |
| Therocephalia | Therocephalia |
| Theron van Akragas | Theron of Acragas |
| Theropoda | Theropoda |
| Thersites | Thersites |
| Therwil | Therwil |
| thesaurie | bursary |
| thesaurier | treasurer |
| thesaurus | thesaurus |
| these | thesis |
| Theseus | Theseus |
| thesis | thesis |
| Thesmophoria | Thesmophoria |
| Thespiae | Thespiae |
| Thesprotia | Thesprotia |
| Thessalië | Thessaly |
| Thessaloniki | Thessaloniki |
| Thetan | Thetan |
| Thetis | Thetis |
| Theudebert I | Theudebert I |
| Theudebert II | Theudebert II |
| Theuderik I | Theuderic I |
| Theuderik I van Austrasië | Theuderic I |
| Theuderik II | Theuderic II |
| Theuderik III | Theuderic III |
| Theuderik IV | Theuderic IV |
| Theudis | Theudis |
| Theudoald | Theudoald |
| Theuma | Theuma |
| They Died with Their Boots On | They Died with Their Boots On |
| Theys Hiyo Eluay | Theys Eluay |
| theïsme | theism |
