Thusis (Italian: Tosana, Romansh: Tusàn) is a municipality in the Viamala Region in the Swiss canton of Graubünden.

Of the rest of the land, 15.2% is settled (buildings or roads) and the remainder (8.6%) is non-productive (rivers, glaciers or mountains).

[6] The municipality is the capital of the Thusis sub-district, of the Hinterrhein district, after 2017 it was part of the Viamala Region.

[3] The germanization is assumed to have begun in the 15th century, with people from the southern parts of Germany and the Wallis.

[6] The historical population is given in the following table:[3] In the 2007 federal election the most popular party was the SVP which received 31.4% of the vote.

[6] From the 2000 census[update], 1,085 or 39.9% are Roman Catholic, while 1,096 or 40.3% belonged to the Swiss Reformed Church.

The wettest month is August during which time Thusis receives an average of 112 mm (4.4 in) of precipitation.

[12] Located a short distance to the southwest of Chur, Thusis is accessible using the A13 Autobahn (Junctions 20 and 21).