Flavius Eustathius (fl. 415–422) was a politician of the Eastern Roman Empire.
In 415-416 he was quaestor sacri palatii; in this capacity he received a copy of a law (Codex Theodosianus i.8.1, "De officio quaestoris", 15 October 415) he had promoted.
Between 420 and 422 he held the high office of Praetorian prefect of the East, while in 421 he held the consulate.
Preceded by Imp. Caesar Flavius Theodosius Augustus IX, Fl. Constantius III |
Consul of the Roman Empire 421 with Fl. Iulius Agricola |
Succeeded by Imp. Caesar Honorius Augustus XIII, Imp. Caesar Flavius Theodosius Augustus X |
Preceded by Fl. Monaxius |
Praetorian prefect of the East 420–422 |
Succeeded by Fl. Asclepiodotus |