In Greek mythology, Zagreus was sometimes used as a name for Dionysus. Alternately, he may have been a separate deity, the son of Zeus with either Demeter or Persephone, who was killed when the Titans cut him into pieces. Some accounts say that he was reassembled and resurrected by Demeter; others, that Zeus fed his heart to Semele in a drink, making her pregnant with Dionysus.

See also: Orpheus

In biology, Zagreus is a genus of ladybird beetle.