Acraephia or Akraiphia, Acraephiae or Akraiphiai (Ἀκραιφίαι), Acraephium or Akraiphion (Ἀκραίφιον), Acraephnium or Akraiphnion (Ἀκραίφνιον), was a town of ancient Boeotia on the slope of Mount Ptoum (Πτῶον) and on the eastern bank of the Lake Copais, which was here called Ἀκραιφὶς λίμνη from the town.