Fürstenau (Romansh: Farschno) is a municipality in the Viamala Region in the Swiss canton of Graubünden and the smallest town to hold city rights with a market right received from Charles IV, Holy Roman Emperor in 1354.

Of the rest of the land, 9.2% is settled (buildings or roads) and the remainder (6.2%) is non-productive (rivers, glaciers or mountains).

[4] Before 2017, the municipality was located in the Domleschg sub-district of the Hinterrhein district, after 2017 it was part of the Viamala Region.

[5] It consists of the village of Fürstenau and Fürstenaubruck, on the right side of the valley.

[8] In the 2007 federal election the most popular party was the SPS which received 32.5% of the vote.

[4] The historical population is given in the following table:[3] Fürstenau has three Swiss Heritage Sites of National Significance.