Aristias of Phlius was a 5th-century BCE tragic poet, the son of the satyr-play pioneer Pratinas. He competed at the City Dionysia in Athens, winning a victory in 467 BCE, the same year Aeschylus produced his Theban trilogy. The Suda places his floruit around the 75th Olympiad (480-477 BCE). His work survives only in fragments.

Ancient sources attribute several plays to him, including the satyr plays Antaeus and Orpheus. Other titles, such as Atalanta and Cyclops, are also recorded, though their precise genre is uncertain. The Suda credits him with 35 plays but only two victories.

Aristias’s significance lies in his connection to the early development of Athenian drama. As Pratinas’s son, he represents a direct link to the codification of the satyr play. His contemporary success against Aeschylus confirms his status as a notable tragedian, though his works were not preserved in the later canonical tradition.