Trevi (Italian: [ˈtrɛːvi]; Latin: Trebiae) is an ancient town and comune (municipality) in Umbria, Italy, on the lower flank of Mount Serano overlooking the wide plain of the Clitunno river system. Located in the Province of Perugia, it is 10 km (6 mi) SSE of Foligno and 20 km (12 mi) north of Spoleto. It is one of I Borghi più belli d'Italia ("The most beautiful villages of Italy").
The population of the comune was c. 8,000 in 2004, with the town proper accounting for about half of that; the rest lives in the frazioni (boroughs) of Borgo, Bovara, Cannaiola, Coste, Pigge, Manciano, Matigge, Parrano, Picciche, San Lorenzo and Santa Maria in Valle. The historical subdivisions of Trevi proper are the terzieri of Castello, Matiggia e Piano; they come into play only for the Palio.