Nea Ionia (, meaning New 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 kmò. The name "New Ionia" refers to refugees from western Anatolia that settled in the area after the Greco-Turkish War (1919-1922).