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- Theodosius the Great (emperor)
- Theodosy (Ivaschenko)
- Theodote and her Children
- Theodotus of Antioch
- Theodotus of Cyrenia
- Theofilos (Manolis) of Lefkas
- Theognostus the Greek
- Theoklitos (Avrantinis) of Aetolia
- Theoklitos (Koumarianos) of Thessaliotis
- Theoklitos (Koumarianos) of Vresthena
- Theoklitos (Passalis) of Florina
- Theoklitos (Setakis) of Ioannina
- Theoleptus II of Constantinople
- Theoleptus I of Constantinople
- Theologian
- Theological School of Halki
- Theological School of Patmos
- Theologos (Apostolidis) of Serres
- Theologos (Chrysanthakopoulos) of Brazzaville
- Theophan (Noli) of Durres
- Theophan (Prokopovich) of Novgorod
- Theophan Noli
- Theophan the Greek
- Theophan the Recluse
- Theophanes (Il'minskii)
- Theophanes (Il'minskii) of Solikamsk
- Theophanes (Kim) of Kyzyl