The Archaeological Museum of Dion is in the village of Dion, adjacent to the ancient sanctuary site, about 17 km south of Katerini. It holds the finds from the ongoing excavations at Ancient Dion — the Macedonian kingdom's great sanctuary dedicated to Zeus, where Alexander the Great made his sacrifices before the Persian campaign of 334 BC.
The centrepiece of the collection is the 2nd-century BC bronze hydraulis — a water organ invented in Alexandria and used in public entertainment in the Greek and Roman world. The Dion specimen was found in 1992 and is the only hydraulis found in archaeological context anywhere in the world; most ancient descriptions of the instrument were doubted until this discovery confirmed its mechanics. The museum also holds fine marble statues including a Medusa head, religious dedications, bronze vessels, coins, and architectural fragments from the temples of Zeus, Demeter, and Isis. The adjacent site is open separately and the two together make for a full half-day visit.