| Castell'Alfero | |
| Official Name: | Comune di Castell'Alfero |
| Coordinates: | 44.9833°N 21°W |
| Region: | Piedmont |
| Province: | Asti (AT) |
| Frazioni: | Callianetto, Stazione, Casotto, Serra Perno, Noveiva, Moncucco, Bricco Beretta |
| Mayor: | Angelo Marengo |
| Area Total Km2: | 20.0 |
| Population Footnotes: | [1] |
| Population Total: | 2763 |
| Population As Of: | 1 January 2016 |
| Population Demonym: | Castellalferesi |
| Elevation M: | 235 |
| Saint: | Sts. Peter and Paul |
| Day: | First Sunday in September |
| Postal Code: | 14033 |
| Area Code: | 0141 |
Castell'Alfero (Castel Alfé) is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 40km (30miles) east of Turin and about 9km (06miles) north of Asti.
Castell'Alfero borders the following municipalities: Asti, Calliano, Corsione, Cossombrato, Frinco, Tonco, and Villa San Secondo.
Castell'Alfero is twinned with:
Lafrançaise, France