Rossa is a municipality in the Moesa Region in the canton of Graubünden in Switzerland.

Of the rest of the land, 0.4% is settled (buildings or roads) and the remainder (49.7%) is non-productive (rivers, glaciers or mountains).

Most of the population (as of 2000[update]) speaks Italian (84.1%), with German being second most common (11.4%) and French being third ( 3.0%).

[8] The age distribution, as of 2000[update], in Rossa is; 5 children or 3.8% of the population are between 0 and 9 years old.

[7] In the 2007 federal election the most popular party was the SP which received 37.2% of the vote.