Fossato di Vico is a town and comune of Umbria in the province of Perugia in Italy, at 581 m above sea‑level on the middle slopes of Mount Mutali.

A rare bronze plaque with a brief inscription to the Dea Cupra in the ancient Umbrian language has been found in the territory of the comune, evidence of pre‑Roman habitation.

Roman vestiges have been found as well, but not in quantities nor concentrations such as to warrant conclusively identifying Fossato with the ancient Helvillum, the site of which remains unknown: the other main candidate is Sigillo.

Fossato was part of the county of Nocera in the 9th century, and after the Vico it was a possession of the Bulgarelli family, who built the current castle.

The economic engine of the comune is the frazione of Osteria del Gatto, in the plain below, with several factories (cheese, packaging materials).