Neorion is one of the oldest Greek heavy industries, located in Ermoupolis, on the Greek island of Syros. Today, it is one of the few remaining major industrial corporations in what used to be the industrial and commercial center of Greece, before being eclipsed by Piraeus in the late 19th century.

Syros, also known as Siros or Syra, is a Greek island in the Cyclades, in the Aegean Sea. It is 78 nautical miles (144 km) south-east of Athens. The area of the island is 83.6 km2 (32 sq mi) and at the 2021 census it had 21,124 inhabitants.