Arcadius of Antioch was a Greek grammarian who flourished in the 2nd century CE. According to the Suda, he wrote treatises on orthography and syntax, and an onomasticon (vocabulary), described as "a wonderful production".
An epitome of the great work of Herodian on general prosody in twenty books, wrongly attributed to Arcadius, is probably the work of Theodosius or a grammarian named Aristodemus. This epitome was the work of a forger of the 16th century. Though meager and carelessly assembled, it is valuable, since it preserves the order of the original and thus affords a trustworthy foundation for its reconstruction.