Ichthyas (; fl. 4th-century BCE), the son of Metallus, was a Greek philosopher and a disciple and successor of Euclid of Megara in the Megarian school.Diogenes Laërtius, ii. 112; Athenaeus, viii. 335; Suda, Euclides He was a colleague of Thrasymachus of Corinth in the school.Diogenes Laërtius, ii. 113 Ichthyas is described as a man of great eminence, and Diogenes of Sinope is said to have addressed a dialogue to him.Diogenes Laërtius, ii. 112; cf. vi. 80
According to Hilarius Emonds,H. Emonds, (1937), Die Oligarchenrevolte zu Megara im Jahre 375 und der Philosoph Ichthyas bei Tertullian, Apol. 46, 16. Rh. Mus. 86, 180-191. correcting a previously misread passage in Tertullian's Apologeticus, Ichthyas was a leader in the oligarchic revolt in Megara in 375 BCE.Tertullian, Apologeticum, 46, 16: "et Ichthyas, dum civitati insidias disponit, occiditur."
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