Cleinias (Kleinias) may refer to a number of people from ancient Greek history:

• Members of the Alcmaeonidae family
  • Cleinias, father of the Athenian statesman and general Alcibiades
  • Cleinias, brother of Alcibiades, younger brother of the famous general
• Cleinias, son of Axiochus; he is introduced as a very young man by Plato in the dialogue called Euthydemus
• Cleinias of Tarentum, Pythagorean philosopher
• Cleinias of Croton, tyrant of Croton c. 495 BC
• Cleinias of Sicyon, magistrate of Sicyon c. 270-264 BC, father of Aratus of Sicyon.

• Injavinskii District
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