The name Clearchus or Clearch may refer to:

• Clearchus of Athens, Greek comic poet of unknown date

• Clearchus of Heraclea (353 BCE), Greek tyrant of Heraclea Pontica

• Clearchus of Rhegium (), Greek sculptor, pupil of Eucheirus, teacher of Pythagoras the sculptor

• Clearchus of Soli (4th–3rd century BCE), Greek author and philosopher, pupil of Aristotle

• Clearchus of Sparta (401 BCE), Greek general, son of Rhampias

• Clearchus (consul 384), Roman consul in 384 CE

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