Cotys III (Ancient Greek: Κότυς, Kotys) was a king of the Odrysians in Thrace in the early 3rd-century BC.
His one secure attestation is an inscription from Delphi dated to sometime between 276 and 267 BC (usually given as 270/269 BC), in which he is named as the son of Raizdos, his probable predecessor.
[1] Scholarship has long associated a coin type struck for a king Cotys on one side and a king Rhescuporis on the other and also a king Cotys, father of a Rhescuporis, named in a decree from Apollonia (Sozopol) with Cotys III.
[2] However, these identifications have been doubted, and some scholars have redated both the coin type and the inscription to almost three centuries later.
[3] It is therefore uncertain whether Cotys III was succeeded by a son named Rhescuporis.