Cyrus (Kuruš) the Younger, son of Darius II of Persia and Parysatis, is a Persian prince and general.

The time of his birth is unknown, but he dies in 401 BCE.

The history of Cyrus and of the retreat of the Greeks is told by Xenophon in his Anabasis.

Another account, probably from Sophaenetus of Stymphalus, was used by Ephorus.

Further information is contained in the excerpts from Ctesias by Photius; Plutarch’s lives of Artaxerxes II and Lysander; also Thucydides' History of Peloponnesian War.

These are the only sources of information for Cyrus the Younger.