Castelnuovo Bormida is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 80 kilometres (50 miles) southeast of Turin and about 20 km (12 mi) south of Alessandria.

Castelnuovo Bormida borders the following municipalities: Cassine, Rivalta Bormida, and Sezzadio.

Castelnuovo Bormida is twinned with:

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