Cesi is a frazione of the Italian comune of Terni, in the province of Terni, southern Umbria, Italy. The small borgo, which retains its late-medieval aspect, set among olive groves, lies "stretched out lengthwise along a narrow contour on the slopes of M. Torre Maggiore," about 18 km north of Terni at an altitude of 437 m, one of the southernmost peaks of the Monti Martani.