Holargos (Greek: Χολαργός) is an affluent suburb of Athens, Greece, located northeast of the city center and about 6 kilometers (3.7 miles) away from Syntagma Square. Since the 2011 local government reform it is part of the municipality Papagou-Holargos, of which it is the seat and a municipal unit. The main thoroughfare is Mesogeion Avenue, which connects Holargos with central Athens and the northern beltway Motorway 6. Holargos was the name of a deme of ancient Attica.