The Diocese of Foligno is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Umbria, Italy. It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Perugia-Città della Pieve.

Foligno is an ancient town of Italy in the province of Perugia in east central Umbria, on the Topino river where it leaves the Apennines and enters the wide plain of the Clitunno river system. It is located 40 kilometres south-east of Perugia, 10 km (6 mi) north-north-west of Trevi and 6 km (4 mi) south of Spello.