Achaemenes (Old Persian: 𐏃𐎧𐎠𐎶𐎴𐎡𐏁 Haxāmaniš; Ancient Greek: Ἀχαιμένης Akhaiménēs; Latin: Achaemenēs) was the progenitor (apical ancestor) of the Achaemenid dynasty of rulers of Persia.

Other than his role as an apical ancestor, nothing is known of his life or actions. It is quite possible that Achaemenes was only the mythical ancestor of the Persian royal house, but if Achaemenes was a historical person, he would have lived around the end of the 8th century and the beginning of the 7th century BC.