Lumnezia is a valley region and a municipality in the Surselva Region in the Swiss of canton of Graubünden. The former municipalities of Cumbel, Degen, Lumbrein, Morissen, Suraua, Vignogn, Vella, and Vrin merged on 1 January 2013 into the new municipality of Lumnezia. It covers the Val Lumnezia, a Swiss high alpine valley. Its upper regions are among the most remote areas in the Swiss Alps. The official language is Romansh.

Surselva Region is one of the eleven administrative districts in the canton of Graubünden in Switzerland. It was created on 1 January 2017 as part of a reorganization of the canton.