Acusilaus or Akousilaos (Greek: Ἀκουσίλαος) of Argos, son of Cabas or Scabras, was a Greeklogographer and mythographer who lived in the latter half of the 6th century BC but whose work survives only in fragments and summaries of individual points.
According to the Suda, Acusilaus wrote genealogies. Three books of his genealogies are quoted, which were for the most part only a translation of Hesiod into prose. Acusilaus claimed to have taken some of his information from bronze tablets discovered in his garden which were inscribed with information, a source looked upon with suspicion by some modern commentators. As with most of the other logographers, he wrote in the Ionic dialect. Plato is the earliest writer by whom he is mentioned. The works which bore the name of Acusilaus in a later age were spurious.