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Eutychius or Eutychios (Greek: Εὐτύχιος, "fortunate") may refer to:
- Eutychius Proclus, 2nd-century grammarian
- Eutychius (exarch) (died 752), last Byzantine exarch of Ravenna
- Saint Eutychius, an early Christian martyr and companion of Placidus
- Saint Eutychius, an early Christian martyr and companion of Arcadius
- Patriarch Eutychius of Constantinople (512–582), Patriarch of Constantinople and saint
- Patriarch Eutychius of Alexandria (877–940), Greek Patriarch of Alexandria and historian
- Michael Astrapas and Eutychios (fl. ca. 1300), Greek painters