Bagnoli del Trigno is a comune in the Province of Isernia in the Italian region Molise, located about 25 kilometres northwest of Campobasso and about 20 kilometres northeast of Isernia. Bagnoli del Trigno borders the following municipalities: Civitanova del Sannio, Duronia, Pietracupa, Salcito. Sights include the Romanesque Church of San Silvestro, built in the 13th-14th centuries between two rock spurs.