Castelmassa is a comune (municipality) in the Province of Rovigo in the Italian region Veneto, located about 90 kilometres (56 mi) southwest of Venice and about 35 kilometres (22 mi) west of Rovigo.

Castelmassa borders the following municipalities: Calto, Castelnovo Bariano, Ceneselli, Felonica, Sermide.

Castelmassa is twinned with:

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