The St. Vincent of Volturno Abbey is a historic Italian Benedictine abbey, founded in the eighth century, situated in the territory of the municipality of Castel San Vincenzo in the province of Isernia, near the sources of Volturno, Molise.
The exterior of the abbey is marked by Roman ruins (built before its construction). There are traces of walls and a colonnade with arches just before the garden of the building.

The current building, located on the east bank of the river, now hosts an American community of sisters, while the archaeological ruins of the medieval abbey are located on the west bank.