Theodorus (bishop of Heraclea in Thrace)

Theodorus (Θεόδωρος; ) was a Christian biblical scholar of the mid-4th century AD. He was bishop of Heraclea in Thrace (also called Perinthus or Heraclea in Europa; modern Marmara Ereğlisi), being appointed some time between 328 and 334; he was an ally of Eusebius against the Athanasians. He should not be confused with Theodore Stratelates (281–319), sometimes called "Theodore of Heraclea," Theodore Stratelates lived in Heraclea Pontica.

In Jerome's De viris illustribus, he writes that Theodorus wrote the following works during the reign of Constantius II :
 * On Matthew and John (fragments of which survive)
 * ''On the Epistles
 * On the Psalter

He was deposed in AD 347 and died around 355.