Kalyvia Thorikou is a town and former municipality located in East Attica, Greece. Following the local government reform of 2011, it became a municipal unit and the seat of the municipality of Saronikos. The municipal unit covers a total area of 70.636 km2.
Historically, the town is recognized as an Arvanite settlement. It serves as a primary administrative center for its surrounding region within the East Attica prefecture.