Anoixi (Greek: Άνοιξη, meaning "spring") is a suburban town in East Attica, Greece. Since the 2011 local government reform it is part of the municipality Dionysos, of which it is a municipal unit. The municipal unit has an area of 4.582 km2.
Anoixi is situated in the hills in the northeastern part of the Athens conurbation, at about 370 m elevation. It lies east of the Parnitha mountains and northwest of the Penteliko Mountain. It is 1 km south of Agios Stefanos, 9 km west of Marathon and 20 km northeast of Athens city centre. Its built-up area is continuous with those of the neighbouring suburbs Agios Stefanos, Drosia and Stamata.