Riein (Romansh pronunciation: [ʁiˈjɛjn] ⓘ) is a village and a former municipality in the district of Surselva in the canton of Graubünden in Switzerland.

Of the rest of the land, 0.9% is settled (buildings or roads) and the remainder (39.9%) is non-productive (rivers, glaciers or mountains).

Most of the population (as of 2000[update]) speaks Romansh(63.4%), with German being second most common (35.2%) and Italian being third ( 1.4%).

[5] The age distribution, as of 2000[update], in Riein is; 6 children or 8.5% of the population are between 0 and 9 years old and 7 teenagers or 9.9% are between 10 and 19.

[4] In the 2007 federal election the most popular party was the SVP which received 68.9% of the vote.