Pythias was a Greek biologist and embryologist, and the first wife of Aristotle.

Pythias may also refer to: Damon and Pythias, characters in Greek mythology Pythias (Roman) (1st century AD), Roman slave Knights of Pythias, an American fraternal organization and secret society

See also Pythius (disambiguation) Pytheas (4th century BC), Greek explorer from modern day Marseilles Pytheas (crater), a lunar crater Pythia, oracle