Santi Aldebrando e Agostino in Cattedrale, or Sant'Aldebrando for short, is the Fossombrone Cathedral, that is, the main Roman Catholic church located in Piazza Mazzini at the end of Corso Garibaldi in the center of the town of Fossombrone, province of Pesaro and Urbino in the region of Marche, Italy. It is the Co-cathedral of the Diocese of Fano-Fossombrone-Cagli-Pergola Coordinates: 43°41′20″N 12°48′19.8″E / 43.68889°N 12.805500°E
The church locale was formerly the site of a Benedictine Abbey. From 1776 to 1784, the church was completely rebuilt in Neoclassical-style by the architect Cosimo Morelli. It has a tall central façade with monumental columns supporting a triangular tympanum. The interior was formulated in three naves with polychrome altars, made of marble and scagliola, designed by Nicola Vici. The altarpieces depict: the Madonna and child with Saints Joseph and Francis and a Madonna and Child with St Anne by Giovanni Francesco Guerrieri; as well as a Madonna and Child with Saints Anne and Aldebrandus by Claudio Ridolfi. The niches inside have bas-reliefs with images of the Virgin and Child, and Saints Aldebrandus, Peter, Paul, and Blaise. The organ was constructed in 1785 by Gaetano Callido, with a restoration in 1996-97.