In Greek mythology, Hilaeira (Ἱλάειρα) (or Ilaeira) was a daughter of Leucippus and Philodice.
As rivers are generally fertile, Inachus had many children, the chief of whom were his two sons, Phoroneus and Aegialeus or Phegeus, and his two daughters, Io and Philodice, wife of Leucippus.