Dionysius of Antioch was an orator active in the 1st and 2nd centuries CE. His epithet associates him with the major Syrian city of Antioch, a significant cultural center in the Roman East. The characterization of his dialect as "Byzantine Greek" is anachronistic for this period; the contemporary linguistic context was Koine or Imperial Greek.

He is credited with a single surviving work, an epistle. The specific title and content of this letter are not attested in the extant historical record.

Dionysius represents one of many literate figures from the eastern Roman Empire whose works are scarcely preserved. His location in Antioch places him within a vital hub of Hellenistic culture and early Christian development, though his precise contributions remain undefined due to the lack of sources.