Nea Ionia is a city and a former municipality in Magnesia, Thessaly, Greece. Since the 2011 local government reform it is part of the municipality Volos, of which it is a municipal unit. It borders the city of Volos. The population at the 2021 census was 31,884 inhabitants. Its land area is 63.314 km². The name "New Ionia" refers to refugees from western Anatolia that settled in the area after the Greco-Turkish War (1919-1922).