San Biagio in Rossate Oratory, Renaissance oratory in Cascina Rossate, Comazzo, Italy.

San Biagio in Rossate Oratory is a small rural oratory with a cruciform plan on a 10-metre square base, its centre rising into an octagonal tiburio with niches cut into the supporting walls. Three pentagonal apses open around the octagon, the one opposite the entrance holding the main altar. The exterior is brick, with corner buttresses shaped like open-book pilasters, and the facade repeats a schematic triumphal-arch motif framed by double cornices and rosettes.

Built before 1532 to designs linked to Bartolomeo Suardi and the Bramante school, the oratory was funded by the Milanese nobleman Bartolomeo Calco, whose son Gerolamo charged his heirs with completing it. Work probably began between the late 15th and early 16th century. Between 1583 and 1589 the two chapels received their altars and wall paintings, later covered by plaster and other decoration.

The oratory depends ecclesiastically on the parish of Lavagna, not on Comazzo itself. Its name comes from San Biagio, to whom the rural chapel at Cascina Rossate is dedicated. The two side chapels received painted altarpieces between 1583 and 1589, later covered by whitewash.

The chapel sits away from the town center, reachable via provincial road SP181 and well marked with signs toward Cascina Rossate. Access is straightforward if you follow the directions and check opening availability beforehand.

The facade repeats a schematic design resembling a triumphal arch, framed by a double continuous cornice with rosettes between the frames that serve both static and decorative functions. This motif recalls Bramante's design for St. Peter's Basilica.