Thestorus or Thestoros () was a town of the Chalcidice in ancient Macedonia. It probably belonged to the Delian League since it appears in the tribute records of Athens of 422/1 BCE,IG I³ 77, col. V,33. but appears in no other extant tribute records. It is cited in a fragment of Theopompus preserved by Stephanus of Byzantium, who states it belonged to Thrace.
Its site is in unlocated, but somewhere in Chalcidice close to the territory of Olynthus.
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