Hellanicus
Hellanicus or Hellanikos (Ancient Greek: Ἑλλάνικος) may refer to:
Hellanicus of Lesbos - an ancient Greek logographer (5th century BC)
Hellanicus (grammarian) - an ancient Greek grammarian (3rd century BC)
Hellanicus of Dulichium, one of the suitors of Penelope in mythology