, Greece, a city on the Saronic Gulf, five miles (8 km) west of central Athens. It is part of metropolitan Athens, and is the leading seaport and manufacturing city in Greece. Piraeus has shipyards, iron foundries, and factories producing tobacco products, textiles, and soap.
Piraeus was planned by Themistocles and built in the fifth century B.C. It was the chief harbor of ancient Greece, and was connected to Athens by two walls. After the fourth century A.D., Piraeus declined gradually into a fishing village. It began to grow again after Greece won independence in the 19th century.