Belmonte del Sannio is a comune (municipality) in the Province of Isernia in the Italian region Molise, located about 35 kilometres (22 mi) northwest of Campobasso and about 30 kilometres (19 mi) northeast of Isernia.

Belmonte del Sannio borders the following municipalities: Agnone, Castiglione Messer Marino, Schiavi di Abruzzo.

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