Boca is a comune (municipality) in the Province of Novara in the Italian region Piedmont, located about 90 kilometres (56 mi) northeast of Turin and about 30 kilometres (19 mi) northwest of Novara. As of 31 December 2004, it had a population of 1,195 and an area of 9.6 square kilometres (3.7 sq mi).

The municipality of Boca contains the frazioni (subdivisions, mainly villages and hamlets) Marello, Fuino, Ronchetto, Baraggia, and Pianorosa.

Boca borders the following municipalities: Cavallirio, Cureggio, Grignasco, Maggiora, Prato Sesia, and Valduggia.

The commune of Boca is home to the Denominazione di origine controllata (DOC) wine which includes 15 hectares (37 acres) producing a single red wine. The wine is a blend of 45-70% Nebbiolo, 20-40% Vespolina and up to 20% of Uva Rara (known locally as Bonarda Novarese). All grapes destined for DOC wine production need to be harvested to a yield no greater than 9 tonnes/ha. The wine is the required to be aged in barrels for at least 2 years with another additional year of aging in the bottle before it can be released to the public. The finished wine must attain a minimum alcohol level of 12% in order to be labelled with the Boca DOC designation.

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