Adeimantus of Collytus (; c. 442 BC – 382 BC),Debra Nails, The People of Plato: A Prosopography of Plato and Other Socratics. Indianapolis: Hackett Publishing, 2002 son of Ariston of Athens, was an ancient Athenian Greek best known as Plato's brother. He plays an important part in Plato's Republic and is mentioned in the Apology and Parmenides dialogues.
In the Republic, Adeimantus is noted for his concern for education, which is apparent from the moment he becomes involved in the discussion.Plato, Republic, 2.362d He is also concerned with the happiness of the auxiliaries in the ideal city.Plato, Republic, 4.419a He questions whether they would be living a good life with little or no personal property. Consequently, Adeimantus is often associated with greed or love for money in interpretations of the dialogue. On the whole, Adeimantus comes across as more cautious, more sober-minded, and less creative than his brother Glaucon, Socrates' other major interlocutor in the last nine books of the Republic.
See also List of speakers in Plato's dialogues
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