Theodorus (bishop of Heraclea in Thrace)

Theodorus (; ) 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.

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