| Theogonie | theogony |
| Theologie | theology |
| Theodosia | Feodosiya |
| Theosophie | theosophy |
| Theodolit | theodolite |
| Theologe | theologian |
| Theologin | theologian |
| Theophanie | theophany |
| Theorie | theory |
| Rheologie | rheology |
| Trogone | trogon |
| Begonie | begonia |
| Theonym | theonym |
| Theorbe | theorbo |
| Theron | Theron |
| Theodizee | theodicy |
| Theodor | Theodore |
| Theokratie | theocracy |
| Therapie | therapy |
| Phlogopit | phlogopite |