Craterus or Krateros (Greek: Κρατερός; c. 370 BC – 321 BC) was a Macedonian general under Alexander the Great and one of the Diadochi. Throughout his life he was a loyal royalist and supporter of Alexander the Great.
Craterus was the son of a Macedonian nobleman named Alexander from Orestis and brother of admiral Amphoterus. Craterus commanded the phalanx and all infantry on the left wing in Battle of Issus in 333 BC. In Hyrcania he was sent on a mission against the Tapurians, his first independent command with the Macedonian army. At the Battle of the Hydaspes in 326 BC, near modern Jhelum, he commanded the rearguard, which stayed on the western bank; his men crossed the river only during the final stages of the battle.
At the festivities in Susa, Craterus married princess Amastris, daughter of Oxyathres, the brother of Darius III. Craterus left Alexanders troops in Opis in 324. Craterus and Polyperchon were appointed to lead 11,500 veteran soldiers back to Macedonia and replace Antipater who was ordered to lead a fresh contingent of soldiers to join Aexanders army in the east. But Craterus arrival to Macedonia was delayed by a lack of vessels for the transport over the sea. Craterus stayed in Cilicia, where he was building the fleet, when Alexander unexpectedly died in Babylon. In case Craterus wouldn't be able to govern in Macedonia due to his health, his successor was to be Polyperchon. At the time, he had about 10,000 veterans with him. Craterus eventually crossed into Europe when Antipater requested assistance from several commanders in the Lamian war, but leaving the supreme command in possession of Antipater.
He sailed with his Cilician navy to Greece and led troops at the Battle of Crannon in 322. When Antigonus rose in rebellion against Perdiccas and Eumenes, Craterus joined him, alongside Antipater and Ptolemy. He married Antipater's daughter Phila, with whom he had a son, also called Craterus.