Sevgein (Romansh pronunciation: [sɛvˈdʑɛjn] ; German: Seewis im Oberland) is a former municipality in the district of Surselva in the Swiss canton of Graubünden. On 1 January 2014 the former municipalities of Sevgein, Castrisch , Ilanz, Ladir , Luven , Pitasch , Riein , Ruschein , Schnaus , Duvin , Pigniu , Rueun and Siat merged into the new municipality of Ilanz/Glion .

Sevgein is first mentioned about 840 as Soviene.

Before the merger, Sevgein had a total area of 4.6 km2 (1.8 sq mi). Of this area, 39.6% is used for agricultural purposes, while 51.5% is forested. Of the rest of the land, 5.2% is settled (buildings or roads), and the remainder (3.7%) is non-productive (rivers, glaciers or mountains).