Santa Maria del Castello in Mesocco, Romanesque church in Mesocco, Grisons, Switzerland.

Santa Maria del Castello in Mesocco is a Romanesque church below the Castello di Mesocco, first documented in 1219 and rebuilt around 1100 as a single nave with two semicircular apses. Its six-storey stone-slab-roofed campanile of 1100 stands on the south side; in 1627 the apses were demolished and the nave extended four metres east, a joint still visible in the south wall.

First documented in a 1219 foundation charter for San Vittore, the church was rebuilt around 1100 as a single-hall structure with two semicircular apsides and a campanile. In 1627 Giovanni Battista Viscardi of San Vittore demolished the old apsides, lengthened the nave four metres eastward and rebuilt the choir under a cross vault; the sacristy followed in 1680.

The north wall carries three stacked fresco bands painted between 1459 and 1469 by the Lombard painters Cristoforo and Nicolao da Seregno, uncle and nephew. The lowest band holds twelve month pictures, each about 115 by 91 cm: January shows a man warming himself at the stove with hams hanging above, October a peasant couple harvesting chestnuts instead of the usual pig. November and December were recreated in 1923 by E. Dillena after models from Monte Carasso.

The church stands just below the Castello di Mesocco, reachable on foot from the village on a path that climbs the hillside. The interior is entered through the south side; the 1469 Saint Christopher fills the facade above. Visits are possible outside service times, and the building is still used for worship.

The oldest of the many visitor inscriptions on the lower facade dates from 1469, the same year the monumental Saint Christopher was painted there. The north wall, about six metres high and twelve long, carries three stacked bands of frescoes made between 1459 and 1469 by Christoforo and Nicolao da Seregno. The lowest band shows twelve month pictures, each 115 by 91 centimetres; October unusually depicts a peasant couple harvesting chestnuts instead of the usual pig fattening.