Coenus (Greek: Koῖνος; died 326 BC), a son of Polemocrates and son-in-law of Parmenion, was one of the ablest and most faithful of Alexander the Great's generals during his eastern expedition.
In the autumn of 334 BC, while Alexander was in Caria, he sent those of his soldiers who had been recently married in Macedonia to spend the ensuing winter with their wives.
After the conquest of Drangiana, in the latter part of 330 BC, Coenus joined others in accusing his wife's brother, Philotas, of treason for conspiring against Alexander.
In this regard, Coenus's distinction as commander of the "best" infantry of the phalanx indicates he was tactically reliable, probably extremely intelligent in warfare, and brave in battle; he was probably the epitome of the highly respected "lead-by-example" Macedonian general.
Arrian states that a short time afterwards, when the Macedonian army had actually commenced its return, Coenus died of an illness (326 BC), and was honoured by the king with a splendid burial.