Stageira (Greek: Στάγειρα) was an ancient Greek city on the Chalcidice peninsula and is chiefly known for being the birthplace of Aristotle. The city lies a few kilometres north of the present-day village of Stagira, close to the city now called Olympias.

Stageira was founded in 655 BC by Ionian settlers from Andros. The Persian emperor Xerxes occupied it in 480 BC. The city later joined the Delian League, lead by Athens, but left in 424 BC: as a result, the Athenian demagogue Cleon laid siege to it in 422 BC. However, Cleon was a poor strategist and his conduct of the siege was very inefficient: so much so that the ancient Greek comedy writer Aristophanes satyrised him in the play known as The Knights. Kleon died in the same year, in the battle of Amphipolis.

Philip II of Macedon later had more success, occupying and destroying the city. As payment for Aristotle's tutoring of his son, who became Alexander the Great, Philip later rebuilt the city and the old city's inhabitants, who had been enslaved, were resettled there. Many new structures were built at this time, including two shrines to Demeter, an aqueduct, and many houses.