Leucippus
Leucippus
Born	Early 5th century BC Abdera or Miletus
Died	5th century BC
Era	Pre-Socratic philosophy
Region	Western Philosophy
School	Pre-Socratic philosophy; Materialism
Main interests	Metaphysics
Notable ideas	Atomism
Influences Zeno of Elea
Influenced Democritus

Leucippus or Leukippos (Ancient Greek: Λεύκιππος, first half of 5th century BC) was a Greek philosopher. He was an early philosopher of atomism, the idea that everything is made up of many tiny things which always continue to exist.

Leucippus was born at Miletus or Abdera, although apparently Epicurus said he never existed. There has long been a controversy about this.