Tujetsch is a municipality in the district of Surselva in the canton of Graubünden in Switzerland.
Tujetsch is first mentioned in 1237 as Thiuesch.
Tujetsch has an area, as of 2006, of 133.9 km2 (51.7 sq mi). Of this area, 25.7% is used for agricultural purposes, while 10.8% is forested. Of the rest of the land, 1.4% is settled (buildings or roads) and the remainder (62%) is non-productive (rivers, glaciers or mountains).
The municipality is located in the Disentis sub-district of the Surselva district. It is located at the entrance to the Oberalp Pass and at the source of the Vorderrhein river. It consists of the village of Sedrun, the sections of Tschamut, Selva, Rueras/Dieni, Camischolas/Zarcuns, Gonda and Bugnei on the left bank of the Vorderrhein, and on the right bank are the settlements of Surrein and Cavorgia. Until 1920 there was no direct route between the village halves on each bank of the Vorderrhein. Until 1976 Tujetsch was known as Tavetsch.