Hellanicus or Hellanikos (Ancient Greek: Ἑλλάνικος) may refer to:
- Hellanicus of Lesbos (5th century BC), Greek logographer
- Hellanicus (grammarian) [it] (3rd century BC), Greek grammarian; see Chorizontes
- Hellanicus (mythology), one of the suitors of Penelope
- Hellanicus of Miletus, ancient Greek historian
- Hellanicus, supposed author of the Hieronyman Theogony
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