Theo - Thra
- Theodahad
- Theodora
- Theodore Graptos
- Theodore I Laskaris
- Theodore I Palaiologos
- Theodore II Laskaris
- Theodore II Palaiologos
- Theodore Komnenos Doukas
- Theodore of Gaza
- Theodore of Mopsuestia
- Theodore of Stoudios
- Theodore of Sykeon
- Theodoret of Cyrrhus
- Theodoric the Great
- Theodosios I
- Theodosios II
- Theodosios III
- Theodosios of Melitene
- Theodosios the Monk
- Theodosioupolis
- Theodotos I Kassiteras
- Theoktistos
- Theology
- Theon of Alexandria
