Aiginio (Greek: Αιγίνιο, Αιγίνιον) is a town and a former municipality in Pieria regional unit, Greece. Since the 2011 local government reform it is part of the municipality Pydna-Kolindros, of which it is the seat and a municipal unit. The population of the municipal unit was 4,869 people and the population the community was 4,345 people as of 2011.
The municipal unit of Aiginio consists of the settlements of Aiginio (population 4,153), Megali Gefyra (population 192) and Katachas (population 524). Aiginio and Megali Gefyra constitute the community of Aiginio while Katachas is the other community of the municipal unit.