Cleophon (Greek: Kλεoφῶν, Kleophōn; died 405 BC) was an Athenian politician and demagogue, who was very influential during the Peloponnesian War.
He was a staunch democrat and vehement opponent of the oligarchs; his sparring with Critias rated a mention in Aristotle's Rhetoric.
During Lysander's ensuing siege, the tide of opinion turned against the democrats, and the oligarchs used the opportunity to rid themselves of their rival.
Cleophon was made the object of satire by the comic poet Plato in an eponymous play (now lost), and by Aristophanes in The Frogs.
Both made fun of Cleophon's Thracian origins and accent: since his father is known to have been an Athenian citizen, his mother is conjectured to have been Thracian and Plato of his low Athenian birth (Andocides says that Cleophon was a harp-maker by trade, and Aelian comments on the poverty of his early life).