Nicomachus (Ancient Greek: Νικόμαχος; fl. c. 375 BC) was the father of Aristotle.
The Suda states that he was a doctor descended from Nicomachus, son of Machaon the son of Asclepius. Greenhill notes he had another son named Arimnestus, and a daughter named Arimneste, by his wife Phaestis, or Phaestias, who was descended from Asclepius as well. He was a native of Stageira, and the friend and physician of Amyntas III, king of Macedonia, 393-369 BC.
Aristotle's son was also called Nicomachus.