Langwies is a former municipality in the district of Plessur in the canton of Graubünden in Switzerland.

Of the rest of the land, 1.2% is settled (buildings or roads) and the remainder (27.5%) is non-productive (rivers, glaciers or mountains).

It consists of the village of Langwies and the hamlets of Platz, Litzirüti, Fondei and Sapün.

[5] The age distribution, as of 2000[update], in Langwies is; 30 children or 9.9% of the population are between 0 and 9 years old and 34 teenagers or 11.2% are between 10 and 19.

The historical population is given in the following table:[2] The Langwieser Viaduct for the Rhätische Bahn is listed as a Swiss heritage site of national significance.