| Theorie | theory |
| Theorbe | theorbo |
| M-Theorie | M-theory |
| Theorem | theorem |
| Therme | thermal bath thermal spring |
| Theme | theme |
| Theogonie | theogony |
| Theonym | theonym |
| Theron | Theron |
| Thetis | Thetis |
| Theia | Theia |
| Theke | counter |
| Themse | Thames |
| Theodizee | theodicy |
| Theodor | Theodore |
| Theokratie | theocracy |
| Theologe | theologian |
| Theologie | theology |
| Therapie | therapy |
| Theriak | antidote |