Ermoupoli (Greek: Ερμούπολη Ermoúpoli), also known with its formal name as Ermoupolis (Greek: Ἑρμούπολις < Ἑρμοῦ πόλις "Hermes town", latinized Hermoupolis), is a city in Greece. It is the capital and main city of the island of Syros and the Cyclades prefecture.
Eventually Ermoupoli was eclipsed by Piraeus in the late 19th century. In the following decades the city declined. Recently, its economy has greatly improved, based on the service industry.