Peucestas (Ancient Greek: Πευκέστας, Peukéstas; lived 4th century BC) was a native of the town of Mieza, in Macedonia, and a distinguished officer in the service of Alexander the Great. His name is first mentioned as one of those appointed to command a trireme on the Hydaspes. Prior to this he must have distinguished himself for his personal valour and prowess, as he was the person selected by Alexander to carry before him in battle the sacred shield, which he had taken down from the temple of Athena at Troy. In this capacity he was in close attendance upon the king's person in the assault on the capital city of the Malavas (325 BC); and all authors agreed in attributing the chief share in saving the life of Alexander upon that occasion to Peucestas, while they differed as to almost all the other circumstances and persons concerned.
For his services on this occasion he was rewarded by the king with almost every distinction which it was in his power to confer. On the arrival of Alexander at Persepolis, he bestowed upon Peucestas the important satrapy of Persis, but, previous to this, he had already raised him to the rank of somatophylax (the king's bodyguard), an honour rendered the more conspicuous in this instance by the number of those select officers being augmented on purpose to make room for his admission. At Susa, also, Peucestas was the first of those rewarded with crowns of gold for their past exploits. After this he proceeded to take possession of his government, where he conciliated the favour of the Persians subject to his rule, as well as that of Alexander himself, by adopting the Persian dress and customs, in exchange for those of Macedonia; whence he is considered a Persophile.