Eutychius

Eutychius or Eutychios (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