| Casamarciano | |
| Coordinates: | 40.9333°N 47°W |
| Region: | Campania |
| Metropolitan City: | Naples (NA) |
| Mayor: | Andrea Manzi |
| Area Total Km2: | 6.3 |
| Population Total: | 3043 |
| Population As Of: | 31-07- 2022[1] |
| Population Demonym: | Casamarcianesi |
| Elevation M: | 70 |
| Postal Code: | 80032 |
| Area Code: | 081 |
Casamarciano is a comune (municipality) in the Metropolitan City of Naples in the Italian region Campania, located about 30km (20miles) northeast of Naples.
Casamarciano borders the following municipalities: Avella, Cimitile, Comiziano, Nola, Tufino, Visciano.