Gigonus or Gigonos () was an ancient Greek polis (city-state) in the Chalcidice, ancient Macedonia. It is cited by Herodotus as one of the cities—together with Lipaxus, Combreia, Lisaea, Campsa, Smila, Aeneia—located in the vicinity of the Thermaic Gulf, in a region called Crusis near the peninsula of Pallene, where Xerxes recruited troops in his expedition of the year 480 BCE against Greece.