Pleistoanax (reigned 459 BC – 409 BC) was an Agiad King of Sparta.
He was exiled in 446BC, charged by the Spartans with taking a bribe to withdraw from the plain of Eleusis in Attica after leading the Peloponnesian forces there.
In 428 BC, he was recalled and restored in obedience to the Delphic oracle's advice.