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.

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.

It does not appear that he took any leading part in the discussions that ensued upon the death of Alexander, but in the division of the provinces that followed, he obtained the renewal of his government of Persis, which he also retained in the second partition at Triparadisus, 321 BC.

But the disaster in the final action at the Battle of Gabiene near Gadamarta (316 BC) which led to the capture of the baggage, and the surrender of Eumenes by the Argyraspids, appears to have been due to the misconduct and insubordination of Peucestas, who, according to one account, was himself one of the chief advisers of the treaty.

His vain and ambitious character seems to have been appreciated at its just value by Antigonus, who, while he deprived him of his satrapy, and led him away a virtual prisoner, elated him with false hopes and specious promises, which were never fulfilled.