克拉底鲁（英语：Cratylus），古希腊哲学家之一，公元前5世纪后期为其鼎盛期，他将赫拉克利特的“流变”理论发展至极限。

Cratylus (/krəˈtaɪləs/; Ancient Greek: Κρατύλος, Kratylos) was an ancient Athenian philosopher from the mid-late 5th century BCE, known mostly through his portrayal in Plato's dialogue Cratylus. He was a radical proponent of Heraclitean philosophy and influenced the young Plato.