Acusilaus or Akousilaos of Argos, son of Cabas or Scabras, was a Greek logographer and mythographer who flourished around 500 BC but whose work survives only in fragments and summaries of individual points.

It is not known whether Acusilaus was of Peloponnesian or Boeotian Argos. Possibly there were two of the name. He is sometimes counted among the Seven Sages of Greece.

Acusilaus claimed to have taken some of his information from bronze tablets discovered in his garden which were inscribed with genealogical information, a source looked upon with suspicion by some modern commentators.