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Polybius (; Ancient Greek: Πολύβιος, Polýbios; c. 200 – c. 118 BC) was an ancient Greek historian of the middle Hellenistic period. He is noted for his Histories, a universal history documenting the rise of Rome in the Mediterranean in the third and second centuries BC. It covers the period 264–146, recording in detail events in Italy, Iberia, Greece, Macedonia, Syria, Egypt and Africa, and documents the Punic Wars and Macedonian Wars among many others.

Polybius's Histories is important not only for being the only Hellenistic historical work to survive in any substantial form, but also for its analysis of constitutional change and the mixed constitution. Polybius's discussion of the separation of powers in government, of checks and balances to limit power, and his introduction of "the people", all influenced Montesquieu's The Spirit of the Laws, John Locke's Two Treatises of Government, and the framers of the United States Constitution.

Polybius was a close friend and mentor to the Roman politician and general Scipio Aemilianus (also called Scipio Africanus the Younger), and had a lasting influence on his decision-making and life.