Kalamos () is a town and a former community in East Attica, Greece. Since the 2011 local government reform it is part of the municipality Oropos, of which it is a municipal unit. The municipal unit has an area of 44.878 km<sup>2</sup>. Kalamos has historically been an Arvanite settlement.
Kalamos is located 2 km from the South Euboean Gulf coast. The seaside village Agioi Apostoloi, 4 km to the east, is also part of the community of Kalamos. Kalamos is 4 km east of Markopoulo Oropou, 8 km north of Kapandriti and 36 km northeast of Athens city center.