Ecphantus or Ecphantos or Ephantus (Έφαντος) was an Ancient Greek pre-Socratic philosopher. He is identified as a Pythagorean of the 4th century BCE from Syracuse, Magna Graecia, but the details concerning his life are historically obscure; he may have not been a historical person, but rather a fictional character invented by Heraclides of Pontus for use in his philosophical dialogues. He also may have been the same figure as the attested Ecphantus of Croton.
