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

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.

Before the merger, Braggio had a total area of 6.9 km2 (2.7 sq mi). Of this area, 9.6% is used for agricultural purposes, while 67.2% is forested.