(Πολυκράτης), an Athenian rhetorician and sophist of some repute, a contemporary of Socrates and Isocrates.
He taught first at Athens and afterwards at Cyprus. He is mentioned as the teacher of Zoilus. He is named along with some of the most distinguished orators of his time by Dionysius of Halicarnassus (de Isaeo, 100.8, de Dem. Eloc. 100.20), who, however, finds great fault with his style.