Diaeus of Megalopolis (, Diaios; died 146 BC) was the last strategos of the Achaian League in ancient Greece before the League was disbanded by the Romans. He served as the League's general from 150 to 149 BC and from 148 BC until his death.

Dispute with the Lacedaemonians

Diaios was probably a son of Diophanes of Megalopolis,

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