Sur (Romansh: Sour) is a village and former municipality in the Sursés in the district of Albula in the canton of Graubünden in Switzerland.

[1] The majority of its population are Romansh-speaking (the Surmiran dialect), with the 2000 census reporting that some 75% claimed it as their first language.

The nearby Burg Spliatsch was built around the beginning of the 13th Century by the Marmels family.

Before the construction of the Rhaetian Railway Sur was a cluster of farm houses and a major side industry was providing guides to travellers.

Of the rest of the land, 0.5% is settled (buildings or roads) and the remainder (43.8%) is non-productive (rivers, glaciers or mountains).

It consists of the hamlets of Furnatsch and Tgacrest as well as four alpine herding camps in Flix.