Riardo is a comune (municipality) in the Province of Caserta in the Italian region Campania, located about 50 kilometres (31 mi) north of Naples and about 25 kilometres (16 mi) northwest of Caserta.

Riardo borders the following municipalities: Pietramelara, Pietravairano, Rocchetta e Croce, Teano, Vairano Patenora.

The communal territory houses the sources of Ferrarelle and Santagata commercial mineral waters.

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