Castello dell'Acqua
Castello dell'Acqua is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy, located about  northeast of Milan and about  east of Sondrio. As of 31 December 2004, it had a population of 693 and an area of .

Castello dell'Acqua borders the following municipalities: Chiuro, Ponte in Valtellina, Teglio.

Demographic evolution