Musaeus, Musaios () or Musäus may refer to:
Greek poets Musaeus of Athens, legendary polymath, considered by the Greeks to be one of their earliest poets Musaeus of Ephesus, lived after 241 BCE Musaeus Grammaticus, lived probably in the beginning of the 6th century Musaeus of Massilia, lived in the first half of the 5th century
Other uses Musaeus (officer of Antiochus III) (fl. 190 BCE), Seleucid Empire Musaeus College, a private girls' school in Colombo, Sri Lanka 10749 Musäus, a main belt asteroid Musaeus (spider), a spider genus of the family Thomisidae
See also Musäus, a surname