| theodoliet | theodolite |
| Theodoor de Bry | Theodor de Bry |
| Theodoor Hendrik van de Velde | Theodoor Hendrik van de Velde |
| Theodoor I van Monferrato | Theodore I of Montferrat |
| Theodoor II van Monferrato | Theodore II of Montferrat |
| Theodor Fontane | Theodor Fontane |
| Theodor Herzl | Theodor Herzl |
| Theodor Heuss | Theodor Heuss |
| Theodor Mommsen | Theodor Mommsen |
| Theodor Morell | Theodor Morell |
| Theodor Rosetti | Theodor Rosetti |
| Theodor Schwann | Theodor Schwann |
| Theodor Storm | Theodor Storm |
| Theodor Svedberg | Theodor Svedberg |
| Theodor-Heuss-Platz | Theodor-Heuss-Platz |
| Theodora | Theodora |
| Theodora I | Theodora |
| Theodora II | Theodora |
| Theodora Megale Komnene | Theodora of Trebizond |
| Theodora van Griekenland en Denemarken | Princess Theodora of Greece and Denmark |
| Theodore Dalrymple | Anthony Daniels |
| Theodore Kaczynski | Theodore Kaczynski |
| Theodore Maiman | Theodore Harold Maiman |
| Theodore Roosevelt | Theodore Roosevelt |
| Theodore Sturgeon | Theodore Sturgeon |
| Theodore T-Bag Bagwell | Theodore T-Bag Bagwell |
| Theodore William Richards | Theodore William Richards |
| Theodoretus van Cyrrhus | Theodoret |
| Theodorik | Theodoric |
| Theodorik de Grote | Theodoric the Great |
| Theodorik de Oudere | Theodoric Strabo |
| Theodorik II | Theodoric II |
| Theodoros I Laskaris | Theodore I Laskaris |
| Theodoros II Laskaris | Theodore II Laskaris |
| Theodoros Pangalos | Theodoros Pangalos |
| Theodoros Zagorakis | Theodoros Zagorakis |
| Theodorus | Theodore |
| Theodorus Beza | Theodore Beza |
| Theodorus II van Ethiopië | Tewodros II of Ethiopia |
| Theodorus van Cyrene | Theodorus of Cyrene |
| Theodorus van Tarsus | Theodore of Tarsus |
| Theodosius | Theodosius |
| Theodosius Dobzhansky | Theodosius Dobzhansky |
| Theodosius I | Theodosius I |
| Theodosius II | Theodosius II |
| Theodosius III | Theodosios III |
| Theodulf | Theodulf of Orléans |
| theofanie | theophany |
| Theofanis Gekas | Theofanis Gekas |
| Theognis | Theognis of Megara |
| theologe | theologian |
| theologie | theology |
| theologisch | theological |
| theoloog | theologian |
| TheOpenCD | OpenCD |
| Theophanis Strelitzas | Theophanes the Cretan |
| Theophano | Theophano |
| Theophanu | Theophanu |
| Theophilos | Theophilos |
| Theophilus | Theophilus |
| Theophilus ben Ananus | Theophilus ben Ananus |
| Theophilus van Byzantium | Theophilos |
| Theophrastaceae | Theophrastaceae |
| Theophrastus | Theophrastus |
| Theopompus | Theopompus |
| theorema | theorem |
| theoreticus | theorist |
| theoretisch | theoretical |
| Theoretische chemie | Theoretical chemistry |
| Theoretische informatica | Theoretical computer science |
| theoretiseren | theorize |
| theorie | theory |
| theorie der vergelijkingen | theory of equations |
| Theorie van alles | Unified field theory |
| Theorie van warmtevloeistof | Caloric theory |
| Theorieën over de moord op president Kennedy | Kennedy assassination theories |
| Theory of constraints | Theory of Constraints |
| theosofie | theosophy |
| theosofisch | theosophic |
| Theosofisch Genootschap Pasadena | Theosophical Society Pasadena |
| Theosofisch Genootschap Point Loma-Covina | Theosophical Society Point Loma-Covina |
| Theosofische Vereniging | Theosophical Society |
| Theotokos | Theotokos |
| Thera | Santorini |
| Theramenes | Theramenes |
| therapeut | therapist |
| Therapeutae | Therapeutae |
| therapeute | therapist |
| therapeutiek | therapeutics |
| therapeutisch | therapeutic |
| Therapeutische breedte | Therapeutic index |
| therapie | therapy |
| Therapsida | Therapsida |
