Castell'Alfero (Piedmontese: Castel Alfé) is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 40 kilometres (25 mi) east of Turin and about 9 kilometres (6 mi) north of Asti.

Castell'Alfero borders the following municipalities: Asti, Calliano, Corsione, Cossombrato, Frinco, Tonco, and Villa San Secondo.

Castell'Alfero is twinned with:

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