Nea Chalkidona (Greek: Νέα Χαλκηδόνα, meaning New Chalcedon) is a suburb of Athens, Greece. Since the 2011 local government reform it is part of the municipality Filadelfeia-Chalkidona, of which it is a municipal unit.
Nea Chalkidona is located 5 km north of the city centre. Its built-up area is continuous with that of Athens and the surrounding northern suburbs Agioi Anargyroi and Nea Filadelfeia. At 0.80 km².
it is the smallest municipal unit in the Athens metropolitan area. Motorway 1 (Athens - Thessaloniki) and Greek National Road 1 pass through Nea Chalkidona. The nearest commuter rail station is Ano Patisia metro station.