Calanca is a municipality in the Moesa Region in the Swiss canton of the Grisons . On 1 January 2015 the former municipalities of Arvigo , Braggio , Cauco and Selma merged to form the new municipality of Calanca.

Arvigo is first mentioned in 1453 as Arvicho.

Braggio is first mentioned in 1419 as Bragio. It was part of the old municipality of Calanca until 1851 when it became an independent municipality.

The church at Cauco is first mentioned in 1497.