Hinterrhein (Romansh: Valragn) is a village and a former municipality in the Viamala Region in the Swiss canton of Graubünden.

The village is located near the start of the river Hinterrhein/Rein Posteriur, one of the two initial tributaries of the Rhine.

Of the rest of the land, 1.2% is settled (buildings or roads) and the remainder (68.5%) is non-productive (rivers, glaciers or mountains).

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

[5] It is a haufendorf (an irregular, unplanned and quite closely packed village, built around a central square) located on the northern portal of the San Bernardino tunnel.

[4] The Alte Landbrücke (Old Bridge) is listed as a Swiss heritage sites of national significance.