| Thalamus | thalamus |
| Thallus | thallus |
| Thanatos | Thanatos |
| Tharau | Tharau |
| Thaddäus | Thaddeus Thaddaeus |
| Thallium | thallium |
| Phallus | phallus |
| Alanus | Alan |
| Thymus | thymus |
| Kalmus | calamus sweet flag |
| Tammus | Tammuz |
| Theismus | theism |
| Thais | Thais |
| Thanaka | thanaka |
| Athanasius | Athanasius |
| Hypothalamus | hypothalamus |
| Thailand | Thailand |
| Thalia | Thalia |
| Halacha | halakha |
| Halm | culm stem |