Charondas was a lawgiver from Catana in Sicily, active in the sixth century BCE. He authored a legal code for his native city and for other Chalcidian colonies in the region, such as Rhegium. Later tradition, likely anachronistic, considered him a student of Pythagoras. A legendary anecdote recounts that after he accidentally violated his own law forbidding armed entry to the public assembly, he committed suicide to uphold the law's authority.

His sole known work is the Laws, a comprehensive legal code now lost. Its provisions are known only through fragmentary references in later authors such as Diodorus Siculus and Stobaeus.

Charondas was a significant early Greek lawgiver alongside figures like Zaleucus of Locri. His laws were renowned for their precision, systematic detail, and distinctive style, which included explanatory preambles. He is credited with legal innovations, most notably the introduction of a suit for false witness to ensure judicial integrity. His legendary suicide became a paradigmatic story about the supremacy of law.