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Agios Stefanos (Greek: Άγιος Στέφανος, romanized: Ágios Stéfanos, meaning Saint Stephen) is a town and a northern suburb of the Athens agglomeration, Greece. Since the 2011 local government reform it is part of the municipality of Dionysos, of which it is the seat and a municipal unit. The municipal unit has an area of 8.136 km.
Geography
Agios Stefanos is situated in the hills in the northeastern part of the Athens conurbation, at about 350 m elevation. It lies east of the Parnitha mountains, northwest of the Penteliko Mountain, and 4 km southwest of the Marathon Reservoir. The source of the river Kifisos is near Agios Stefanos. It is 9 km west of Marathon and 21 km northeast of Athens city centre. Its built-up area is continuous with those of the neighbouring suburbs Anoixi and Stamata to the south.