| Castelnuovo Calcea | |
| Official Name: | Comune di Castelnuovo Calcea |
| Coordinates: | 44.7833°N 25°W |
| Region: | Piedmont |
| Province: | Asti (AT) |
| Mayor: | Roberto Guastello |
| Area Total Km2: | 8.2 |
| Population Footnotes: | [1] |
| Population Total: | 726 |
| Population As Of: | 30 December 2019 |
| Population Demonym: | Castelnuovesi |
| Elevation M: | 246 |
| Saint: | St. Stephen |
| Day: | 26 December |
| Postal Code: | 14040 |
| Area Code: | 0141 |
Castelnuovo Calcea is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 60km (40miles) southeast of Turin and about 15km (09miles) southeast of Asti.