Nea Ionia is a town and a northern suburb of the Athens agglomeration, Greece, and a municipality of the Attica region. It was named after Ionia, the region in Anatolia from which many Greeks migrated in the 1920s as a part of the population exchange between Greece and Turkey. Many of the town families originated from the town of Alanya which is currently a part of Turkey.

Ionia was an ancient region on the western coast of Anatolia, to the south of present-day İzmir, Turkey. It consisted of the northernmost territories of the Ionian League of Greek settlements. Never a unified state, it was named after the Ionians who had settled in the region before the archaic period.