Lumbrein is a former municipality in the district of Surselva in the Swiss canton of Graubünden. The municipalities of Cumbel , Degen, Lumbrein, Morissen , Suraua , Vignogn , Vella , and Vrin merged on 1 January 2013 into the new municipality of Lumnezia .

The Crestaulta hill near the hamlet of Surin was occupied since at least the early Bronze Age (ca. 2000-1700/1600 BC). However, Lumbrein is first mentioned about 850 as in villa Lamarine though this comes from a 16th-century copy of an earlier and now lost document. In 1231 it was mentioned as de Lumarins.