Callisthenes of Olynthus (; ; c. 360 – 328 BC) was a
Greek historian. He was the son of Hero (niece of
Aristotle), the daughter of
Proxenus of Atarneus and
Arimneste, which made him the great nephew of Aristotle by his sister
Arimneste. They first met when Aristotle tutored
Alexander the Great. Through his great-uncle's influence, he was later appointed to attend Alexander the Great on his Asiatic expedition as a professional historian.