| Riardo | |
| Official Name: | Comune di Riardo |
| Coordinates: | 41.2667°N 23°W |
| Region: | Campania |
| Province: | Caserta (CE) |
| Mayor: | Armando Fusco |
| Area Total Km2: | 16.48 |
| Population Footnotes: | [1] |
| Population Total: | 2200 |
| Population As Of: | 16 June 2017 |
| Population Demonym: | Riardesi |
| Elevation M: | 192 |
| Postal Code: | 81053 |
| Area Code: | 0823 |
Riardo is a comune (municipality) in the Province of Caserta in the Italian region Campania, located about 50km (30miles) north of Naples and about 25km (16miles) 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.