Castelnovo di Sotto (Reggiano: Castelnōv) is a comune (municipality) in the Province of Reggio Emilia in the Italian region Emilia-Romagna, located about 70 kilometres (43 mi) northwest of Bologna and about 14 kilometres (9 mi) northwest of Reggio Emilia.

Castelnovo di Sotto borders the following municipalities: Boretto, Cadelbosco di Sopra, Campegine, Gattatico, Gualtieri, Poviglio.

It is home of one of the most ancient carnivals in Italy, dating from the 16th century.

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