Bregaglia (Italian and Romansh: Bregagliaⓘ) is a municipality in the Maloja Region in the canton of Grisons in Switzerland.

It was formed by the 2010 merger of the municipalities of Bondo, Castasegna, Soglio, Stampa and Vicosoprano, all located in the Val Bregaglia.

In 1367 Bondo, together with the rest of Sotto Porta/Unterporta, joined the League of God's House (German: Gotteshausbund).

During the 16th century some of the population left Bondo to Italy, and later to eastern Europe (either as bakers or soldiers).

This trend has continued into the 20th century, except many now leave for northern Graubünden or the rest of Switzerland.

In 1621, during the Confusion, Spanish troops burned the entire town to the ground, destroying about 248 structures.

The town's name means chestnut grove and the tree is featured on the coat of arms.

[9] The historical population is given in the following chart:[12] The Castelmur medieval fortifications, the church of S. Maria and the Palazzo Salis in Bondo, the Casa Antonio No.

120 in Soglio and the Palazzo Castelmur in Stampa are listed as Swiss heritage sites of national significance.

[13] The church of S. Maria in Castelmur was largely rebuilt in the 19th century, but still has its Romanesque campanile.

This church was restored in the 17th century but retains an important late 15th-century fresco cycle.

[9] In the second quarter of 2016 an average of 370 workers commuted from outside Switzerland to work in the municipality, representing a large minority of the employees.

[18] Elektrizitätswerk der Stadt Zürich (EWZ) operates a power plant in Castasegna.

[19] In 2014 the crime rate, of the over 200 crimes listed in the Swiss Criminal Code (running from murder, robbery and assault to accepting bribes and election fraud), in Bregaglia was 15.3 per thousand residents or about 23.7% of the average rate in the entire country.

The rate of violations of immigration, visa and work permit laws was 4.5 per thousand residents.

The wettest month is May during which time Vicosoprano receives an average of 185 mm (7.3 in) of precipitation.