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.
:Certain examples that Aristotle attributes to Democritus and Leucippus clearly prefigure it, but its belated inventor is Gustav Theodor Fechner, and its first exponent, Kurd Lasswitz.
Other subjects include Hades kidnapped Persephone, Eos kidnapped Cephalus, and Castor and Pollux abducting the daughters of Leucippus.