Theodosius III (disambiguation)

Theodosius III was the Byzantine emperor from 715 to 717.

Theodosius III or Theodosios III may also refer to:

• Theodosius III of Abkhazia, King of the Abkhazians from circa 975 to 978
• Theodosius III of Antioch, Patriarch of Antioch during the mid-11th century
• Pope Theodosius III of Alexandria, Coptic pope between 1294 and 1300