Sumvitg (Romansh pronunciation: [ˈsumvitɕ] ⓘ; German: Somvix) is a municipality in the Surselva Region in the canton of Graubünden in Switzerland.

Of the rest of the land, 1.3% is settled (buildings or roads) and the remainder (47.1%) is non-productive (rivers, glaciers or mountains).

It consists of the village of Sumvitg and the hamlets of Surrein, Rabius, Laus and Compadials as well as numerous farm houses.

Most of the population (as of 2000[update]) speaks Romansh(88.0%), with German being second most common (10.0%) and Italian being third ( 1.1%).

[4] From the 2000 census[update], 1,199 or 91.3% are Roman Catholic, while 35 or 2.7% belonged to the Swiss Reformed Church.

[8] The historical population is given in the following table:[3] The Punt Russein bridge (shared with Disentis/Mustér) is listed as a Swiss heritage site of national significance.