Antiphon (Ancient Greek: Ἀντιφῶν) was a man of ancient Greece who was the youngest brother of the philosopher Plato. His name the philosopher immortalized in his dialogue Parmenides. The father of Plato's wife was likewise named Antiphon.
This article incorporates text from a publication now in the public domain: Smith, William (1870). "Antiphon". In Smith, William. Dictionary of Greek and Roman Biography and Mythology. 1. p. 207.